| Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended | |
|---|---|---|
| Dec. 31, 2020 | Dec. 31, 2019 | |
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ||
| Total Gain (loss) on long-lived assets held and used | $ (20,800) | |
| Total Gain (loss) on goodwill | $ (268,000) | |
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- Definition Line items related to fair value of assets and liabilities that are measured on a non-recurring basis. No definition available. 
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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