Derivative Financial Instruments - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative liability	$ (50,910)	$ (14,650)
Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Derivative liability	(50,910)	(6,782)
Interest rate swap and cap contracts | Derivatives designated as hedging instruments: | Prepaid expenses, deferred costs, and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	0	1,872
Interest rate swap and cap contracts | Derivatives designated as hedging instruments: | Prepaid expenses, deferred costs, and other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset	0	8,766
Interest rate swap and cap contracts | Derivatives designated as hedging instruments: | Current portion of other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(23,916)	(7,697)
Interest rate swap and cap contracts | Derivatives designated as hedging instruments: | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(26,994)	(9,723)
Foreign currency forward contracts | Derivatives not designated as hedging instruments: | Current portion of other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	$ 0	$ (7,868)