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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":"2010-12-31","val":21095000,"accn":"0000036047-12-000029","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-04-30","frame":"CY2010Q4I"},{"end":"2010-12-31","val":21095000,"accn":"0000036047-12-000016","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2011-12-31","val":22044000,"accn":"0000036047-12-000029","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-04-30","frame":"CY2011Q4I"},{"end":"2011-12-31","val":22044000,"accn":"0000036047-12-000016","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2017-03-31","val":17423000,"accn":"0000036047-18-000051","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-26","frame":"CY2017Q1I"},{"end":"2017-06-30","val":17435000,"accn":"0000036047-18-000094","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-26","frame":"CY2017Q2I"},{"end":"2017-09-30","val":13532000,"accn":"0000036047-18-000115","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-25","frame":"CY2017Q3I"},{"end":"2018-03-31","val":9806000,"accn":"0000036047-19-000062","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-25","frame":"CY2018Q1I"},{"end":"2018-03-31","val":7540000,"accn":"0000036047-18-000051","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-26"},{"end":"2018-06-30","val":9756000,"accn":"0000036047-19-000086","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-25","frame":"CY2018Q2I"},{"end":"2018-06-30","val":9756000,"accn":"0000036047-18-000094","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-26"},{"end":"2018-09-30","val":10355000,"accn":"0000036047-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-24","frame":"CY2018Q3I"},{"end":"2018-09-30","val":10355000,"accn":"0000036047-18-000115","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-25"},{"end":"2018-12-31","val":9967000,"accn":"0000036047-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-24","frame":"CY2018Q4I"},{"end":"2018-12-31","val":9967000,"accn":"0000036047-19-000086","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-25"},{"end":"2019-03-31","val":11134000,"accn":"0000036047-20-000027","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-01","frame":"CY2019Q1I"},{"end":"2019-03-31","val":11134000,"accn":"0000036047-19-000062","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-25"},{"end":"2019-06-30","val":11662000,"accn":"0000036047-20-000047","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-27","frame":"CY2019Q2I"},{"end":"2019-06-30","val":11662000,"accn":"0000036047-19-000086","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-25"},{"end":"2019-09-30","val":11616000,"accn":"0000036047-20-000059","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-11-04","frame":"CY2019Q3I"},{"end":"2019-09-30","val":11616000,"accn":"0000036047-19-000098","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-24"},{"end":"2020-03-31","val":9714000,"accn":"0000036047-21-000033","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-07","frame":"CY2020Q1I"},{"end":"2020-03-31","val":9714000,"accn":"0000036047-20-000027","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-01"},{"end":"2020-06-30","val":9494000,"accn":"0000036047-20-000047","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-27","frame":"CY2020Q2I"},{"end":"2020-09-30","val":10129000,"accn":"0000036047-20-000059","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-11-04","frame":"CY2020Q3I"},{"end":"2021-03-31","val":9966000,"accn":"0000036047-21-000033","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-07","frame":"CY2021Q1I"}]}},"RestrictedCashAndInvestmentsNoncurrent":{"label":"Restricted Cash and Investments, Noncurrent","description":"The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. 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Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or 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This element increases net cash provided by operating activities.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-3423000,"accn":"0000036047-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2010"},{"start":"2011-01-01","end":"2011-09-30","val":-234000,"accn":"0000036047-12-000067","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-26"},{"start":"2011-01-01","end":"2011-12-31","val":-363000,"accn":"0000036047-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-56000,"accn":"0000036047-13-000021","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-26","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-09-30","val":-643000,"accn":"0000036047-12-000067","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-26"},{"start":"2012-01-01","end":"2012-12-31","val":-947000,"accn":"0000036047-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-2321000,"accn":"0000036047-13-000021","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-26","frame":"CY2013Q1"}]}},"TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit":{"label":"Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)","description":"Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.","units":{"USD":[{"start":"2018-01-01","end":"2018-12-31","val":38000000,"accn":"0000036047-21-000018","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-01","frame":"CY2018"}]}},"TaxesPayableCurrentAndNoncurrent":{"label":"Taxes Payable","description":"Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.","units":{"USD":[{"end":"2010-12-31","val":0,"accn":"0000036047-11-000013","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2010Q4I"},{"end":"2011-09-30","val":4288000,"accn":"0000036047-11-000013","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0000036047-12-000067","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-26","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0000036047-12-000056","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24"},{"end":"2012-06-30","val":33794000,"accn":"0000036047-12-000056","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2012Q2I"},{"end":"2012-09-30","val":14849000,"accn":"0000036047-12-000067","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-26","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0000036047-13-000052","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-25","frame":"CY2012Q4I"},{"end":"2012-12-31","val":0,"accn":"0000036047-13-000037","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-26"},{"end":"2012-12-31","val":0,"accn":"0000036047-13-000021","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-26"},{"end":"2013-03-31","val":20704000,"accn":"0000036047-13-000021","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-26","frame":"CY2013Q1I"},{"end":"2013-06-30","val":12234000,"accn":"0000036047-13-000037","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-26","frame":"CY2013Q2I"},{"end":"2013-09-30","val":20796000,"accn":"0000036047-13-000052","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-25","frame":"CY2013Q3I"},{"end":"2013-12-31","val":0,"accn":"0000036047-14-000052","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-24","frame":"CY2013Q4I"},{"end":"2013-12-31","val":0,"accn":"0000036047-14-000038","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25"},{"end":"2014-06-30","val":35000000,"accn":"0000036047-14-000038","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25","frame":"CY2014Q2I"},{"end":"2014-09-30","val":44313000,"accn":"0000036047-14-000052","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-24","frame":"CY2014Q3I"}]}},"TemporaryEquityCarryingAmount":{"label":"Temporary Equity, Carrying Amount (Deprecated 2012-01-31)","description":"The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. 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