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Cash Equivalents, and Short-term Investments","description":"Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.","units":{"USD":[{"end":"2017-12-31","val":59174000,"accn":"0000009346-18-000017","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-13","frame":"CY2017Q4I"},{"end":"2018-12-31","val":156855000,"accn":"0000009346-19-000012","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2018Q4I"},{"end":"2019-12-31","val":59780000,"accn":"0000009346-20-000006","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-06","frame":"CY2019Q4I"},{"end":"2020-12-31","val":47026000,"accn":"0000009346-21-000024","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11","frame":"CY2020Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2015-12-31","val":73538000,"accn":"0000009346-19-000012","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2015Q4I"},{"end":"2016-12-31","val":62976000,"accn":"0000009346-18-000027","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2016-12-31","val":62976000,"accn":"0000009346-18-000076","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08"},{"end":"2016-12-31","val":62976000,"accn":"0000009346-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"end":"2016-12-31","val":62976000,"accn":"0000009346-19-000012","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07"},{"end":"2016-12-31","val":62976000,"accn":"0000009346-20-000006","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-06","frame":"CY2016Q4I"},{"end":"2017-03-31","val":61761000,"accn":"0000009346-18-000027","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2017Q1I"},{"end":"2017-06-30","val":81080000,"accn":"0000009346-18-000076","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08","frame":"CY2017Q2I"},{"end":"2017-09-30","val":68529000,"accn":"0000009346-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2017Q3I"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-18-000027","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-18-000076","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-19-000012","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-19-000027","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-08"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-19-000081","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-07"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-20-000006","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-06"},{"end":"2017-12-31","val":68713000,"accn":"0000009346-21-000024","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11","frame":"CY2017Q4I"},{"end":"2018-03-31","val":83233000,"accn":"0000009346-18-000027","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2018-03-31","val":83233000,"accn":"0000009346-19-000027","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-08","frame":"CY2018Q1I"},{"end":"2018-06-30","val":82805000,"accn":"0000009346-18-000076","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08"},{"end":"2018-06-30","val":82805000,"accn":"0000009346-19-000081","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-07","frame":"CY2018Q2I"},{"end":"2018-09-30","val":115131000,"accn":"0000009346-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"end":"2018-09-30","val":115131000,"accn":"0000009346-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06","frame":"CY2018Q3I"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-19-000012","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-19-000027","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-08"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-19-000081","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-07"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-20-000006","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-06"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-20-000038","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-06"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-20-000067","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-20-000076","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-04"},{"end":"2018-12-31","val":170811000,"accn":"0000009346-21-000024","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11","frame":"CY2018Q4I"},{"end":"2019-03-31","val":133306000,"accn":"0000009346-19-000027","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-08"},{"end":"2019-03-31","val":133306000,"accn":"0000009346-20-000038","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-06","frame":"CY2019Q1I"},{"end":"2019-06-30","val":97105000,"accn":"0000009346-19-000081","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-07"},{"end":"2019-06-30","val":97105000,"accn":"0000009346-20-000067","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05","frame":"CY2019Q2I"},{"end":"2019-09-30","val":108187000,"accn":"0000009346-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06"},{"end":"2019-09-30","val":108187000,"accn":"0000009346-20-000076","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-04","fr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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest 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Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0000009346-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000009346-14-000004","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000009346-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInFourYears":{"label":"Operating Leases, Future Minimum Payments, Due in Four Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. 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