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This item includes treasury stock repurchased by the entity. 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Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2014-12-31","val":354000,"accn":"0001193125-15-291593","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":354000,"accn":"0001193125-15-378563","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16"},{"end":"2014-12-31","val":354000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014Q4I"},{"end":"2015-06-30","val":357000,"accn":"0001193125-15-291593","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":342000,"accn":"0001193125-15-378563","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2015Q3I"},{"end":"2015-12-31","val":316000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2015-12-31","val":316000,"accn":"0001193125-16-585773","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10"},{"end":"2015-12-31","val":316000,"accn":"0001193125-16-676953","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09"},{"end":"2015-12-31","val":316000,"accn":"0001564590-16-028716","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"end":"2015-12-31","val":316000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2015Q4I"},{"end":"2016-03-31","val":783000,"accn":"0001193125-16-585773","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2016Q1I"},{"end":"2016-06-30","val":360000,"accn":"0001193125-16-676953","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09","frame":"CY2016Q2I"},{"end":"2016-09-30","val":958000,"accn":"0001564590-16-028716","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3I"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-010310","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-023541","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-13"},{"end":"2016-12-31","val":578000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-06-30","val":18000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2014-12-31","val":53060000,"accn":"0001193125-15-221796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-06-12"},{"end":"2014-12-31","val":53060000,"accn":"0001193125-15-291593","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":53060000,"accn":"0001193125-15-378563","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16"},{"end":"2014-12-31","val":53604000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014Q4I"},{"end":"2015-03-31","val":49462000,"accn":"0001193125-15-221796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-06-12","frame":"CY2015Q1I"},{"end":"2015-06-30","val":49576000,"accn":"0001193125-15-291593","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":49318000,"accn":"0001193125-15-378563","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2015Q3I"},{"end":"2015-12-31","val":49441000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2015-12-31","val":49441000,"accn":"0001193125-16-585773","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10"},{"end":"2015-12-31","val":49441000,"accn":"0001193125-16-676953","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09"},{"end":"2015-12-31","val":49441000,"accn":"0001564590-16-028716","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"end":"2015-12-31","val":49441000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2015Q4I"},{"end":"2016-03-31","val":49627000,"accn":"0001193125-16-585773","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2016Q1I"},{"end":"2016-06-30","val":35360000,"accn":"0001193125-16-676953","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09","frame":"CY2016Q2I"},{"end":"2016-09-30","val":35521000,"accn":"0001564590-16-028716","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3I"},{"end":"2016-12-31","val":32522000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2016-12-31","val":32522000,"accn":"0001564590-17-010310","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2016-12-31","val":32522000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":32522000,"accn":"0001564590-17-023541","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-13"},{"end":"2016-12-31","val":32522000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":31991000,"accn":"0001564590-17-010310","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2017Q1I"},{"end":"2017-06-30","val":32210000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":32402000,"accn":"0001564590-17-023541","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-13","frame":"CY2017Q3I"},{"end":"2017-12-31","val":32616000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2017Q4I"}]}},"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":"2014-12-31","val":4479000,"accn":"0001193125-15-221796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-06-12"},{"end":"2014-12-31","val":4479000,"accn":"0001193125-15-291593","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":4479000,"accn":"0001193125-15-378563","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16"},{"end":"2014-12-31","val":4479000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1125000,"accn":"0001193125-15-221796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-06-12","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1482000,"accn":"0001193125-15-291593","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1467000,"accn":"0001193125-15-378563","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1441000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2015-12-31","val":1441000,"accn":"0001193125-16-585773","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10"},{"end":"2015-12-31","val":1441000,"accn":"0001193125-16-676953","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09"},{"end":"2015-12-31","val":1441000,"accn":"0001564590-16-028716","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"end":"2015-12-31","val":1441000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1908000,"accn":"0001193125-16-585773","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2016Q1I"},{"end":"2016-06-30","val":2110000,"accn":"0001193125-16-676953","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09","frame":"CY2016Q2I"},{"end":"2016-09-30","val":2708000,"accn":"0001564590-16-028716","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3I"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-010310","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-023541","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-13"},{"end":"2016-12-31","val":578000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":1313000,"accn":"0001564590-17-010310","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2017Q1I"},{"end":"2017-06-30","val":2643000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":3938000,"accn":"0001564590-17-023541","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-13","frame":"CY2017Q3I"},{"end":"2017-12-31","val":32616000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2017Q4I"}]}},"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":"2015-12-31","val":29000000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2015Q4I"},{"end":"2016-12-31","val":29000000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2016-12-31","val":29000000,"accn":"0001564590-17-010310","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2016-12-31","val":29000000,"accn":"0001564590-17-017138","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":29000000,"accn":"0001564590-17-023541","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-13"},{"end":"2016-12-31","val":29000000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-12-31","val":34500000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2017Q4I"}]}},"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":"2015-12-31","val":1441000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":578000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2016Q4I"},{"end":"2017-12-31","val":32616000,"accn":"0001564590-18-007376","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2017Q4I"}]}},"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":"2015-12-31","val":47156000,"accn":"0001193125-16-505342","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":5250000,"accn":"0001564590-17-005808","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2016Q4I"}]}},"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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