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Combined Guarantor Subsidiaries - Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Details) - Guarantor Subsidiaries - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets $ 95,300,000   $ 67,300,000
Long-lived assets 60,170,000 $ 0 43,007,000
Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets $ 95,300,000   $ 67,300,000