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Excludes capital lease obligations.","units":{"USD":[{"end":"2011-12-31","val":1728000,"accn":"0000830052-13-000007","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2013-03-08"},{"end":"2011-12-31","val":1728000,"accn":"0000830052-13-000009","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2013-03-08"},{"end":"2011-12-31","val":1728000,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-06-30","val":1638000,"accn":"0000830052-13-000007","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2013-03-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":1592000,"accn":"0000830052-13-000009","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2013-03-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":1545499,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":1545000,"accn":"0000830052-13-000027","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":1545000,"accn":"0000830052-13-000034","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":1545000,"accn":"0000830052-13-000047","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":1545000,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2013-03-31","val":1498000,"accn":"0000830052-13-000027","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1449000,"accn":"0000830052-13-000034","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":1399000,"accn":"0000830052-13-000047","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1348821,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"end":"2013-12-31","val":1349000,"accn":"0000830052-14-000019","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2013-12-31","val":1348821,"accn":"0000830052-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":1348821,"accn":"0000830052-14-000037","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":1349000,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1297000,"accn":"0000830052-14-000019","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1244635,"accn":"0000830052-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":1191014,"accn":"0000830052-14-000037","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":1136347,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":1136347,"accn":"0000830052-15-000009","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14"},{"end":"2014-12-31","val":1136347,"accn":"0000830052-15-000018","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":1136347,"accn":"0001628280-15-008819","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1080735,"accn":"0000830052-15-000009","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1023914,"accn":"0000830052-15-000018","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0001628280-15-008819","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2015Q3I"}]}},"LongTermDebtCurrent":{"label":"Long-term Debt, Current Maturities","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2010-12-31","val":168522,"accn":"0000830052-11-000018","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":168522,"accn":"0000830052-11-000027","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":168522,"accn":"0000830052-12-000009","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28","frame":"CY2010Q4I"},{"end":"2011-06-30","val":175159,"accn":"0000830052-11-000018","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":178574,"accn":"0000830052-11-000027","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":182056,"accn":"0000830052-12-000009","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28"},{"end":"2011-12-31","val":182056,"accn":"0000830052-12-000015","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11"},{"end":"2011-12-31","val":182056,"accn":"0000830052-12-000028","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":182056,"accn":"0000830052-12-000037","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":182056,"accn":"0000830052-13-000007","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2013-03-08"},{"end":"2011-12-31","val":182056,"accn":"0000830052-13-000009","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2013-03-08"},{"end":"2011-12-31","val":182056,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-03-31","val":185607,"accn":"0000830052-12-000015","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11","frame":"CY2012Q1I"},{"end":"2012-06-30","val":189226,"accn":"0000830052-12-000028","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2012-06-30","val":189226,"accn":"0000830052-13-000007","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2013-03-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":192916,"accn":"0000830052-12-000037","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2012-09-30","val":192916,"accn":"0000830052-13-000009","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2013-03-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":196678,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":196678,"accn":"0000830052-13-000027","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":196678,"accn":"0000830052-13-000034","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":196678,"accn":"0000830052-13-000047","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":196678,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2013-03-31","val":200513,"accn":"0000830052-13-000027","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":204423,"accn":"0000830052-13-000034","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":208410,"accn":"0000830052-13-000047","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":212474,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"end":"2013-12-31","val":212474,"accn":"0000830052-14-000019","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2013-12-31","val":212474,"accn":"0000830052-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":212474,"accn":"0000830052-14-000037","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":212474,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":216617,"accn":"0000830052-14-000019","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1I"},{"end":"2014-06-30","val":220841,"accn":"0000830052-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":225148,"accn":"0000830052-14-000037","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":229538,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":229538,"accn":"0000830052-15-000009","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14"},{"end":"2014-12-31","val":229538,"accn":"0000830052-15-000018","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":229538,"accn":"0001628280-15-008819","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2014Q4I"},{"end":"2015-03-31","val":234014,"accn":"0000830052-15-000009","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1I"},{"end":"2015-06-30","val":238578,"accn":"0000830052-15-000018","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0001628280-15-008819","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2015Q3I"}]}},"LongTermDebtFairValue":{"label":"Long-term Debt, Fair Value","description":"The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.","units":{"USD":[{"end":"2011-12-31","val":1931000,"accn":"0000830052-12-000028","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":1931000,"accn":"0000830052-12-000037","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":1931000,"accn":"0000830052-13-000007","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2013-03-08"},{"end":"2011-12-31","val":1931000,"accn":"0000830052-13-000009","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2013-03-08"},{"end":"2011-12-31","val":1931000,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-06-30","val":1824000,"accn":"0000830052-12-000028","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2012-06-30","val":1824000,"accn":"0000830052-13-000007","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2013-03-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":1776000,"accn":"0000830052-12-000037","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2012-09-30","val":1776000,"accn":"0000830052-13-000009","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2013-03-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":1713163,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":1713000,"accn":"0000830052-13-000027","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":1713000,"accn":"0000830052-13-000034","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":1713000,"accn":"0000830052-13-000047","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":1713000,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2013-03-31","val":1654000,"accn":"0000830052-13-000027","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1576000,"accn":"0000830052-13-000034","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":1518000,"accn":"0000830052-13-000047","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1469000,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"end":"2013-12-31","val":1469000,"accn":"0000830052-14-000019","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2013-12-31","val":1469000,"accn":"0000830052-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":1469000,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1410000,"accn":"0000830052-14-000019","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1359000,"accn":"0000830052-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-12-31","val":1226000,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":390947,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":101544,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":196678,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":212474,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":229538,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":267889,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":289403,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":101544,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":247973,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":267889,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":289403,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":229538,"accn":"0000830052-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":247973,"accn":"0000830052-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":267889,"accn":"0000830052-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. 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