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Fair Value Measurements - Fair Value, by Balance Sheet Grouping (Details) - Fair Value Measurements Using Level 3 - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Carrying Amount |  |
Liabilities |  |
Carrying Amount | $ 1,341,242 | $ 1,311,977
Fair Value |  |
Liabilities |  |
Fair Value | $ 1,368,151 | $ 1,276,589

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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=121572278&loc=d3e13433-108611 + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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