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Assets and Liabilities Measured at Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financial assets (liabilities), Carrying value |  |
Current and long-term debt, carrying amount | $ (2,988,067) | $ (2,803,381)
Financial assets (liabilities), Fair value |  |
Current and long-term debt, fair value | $ (2,948,171) | $ (3,074,929)

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- Definition Assets and Liabilities [Abstract] + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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- References No definition available. + Details
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- Definition Amount of long-term debt and lease obligation, including portion classified as current. + References No definition available. + Details
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