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Long-Term Debt - Effects of Interest Rate Swap and Cap Agreements (Details) - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of unrealized (losses) gains in OCI on interest rate cap agreements	$ (16,346)	$ 1,151	$ (133)
Reclassification from accumulated other comprehensive income into net income	5,313	6,377	6,286
Related income tax benefit (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of unrealized (losses) gains in OCI on interest rate cap agreements	5,435	(415)	48
Reclassification from accumulated other comprehensive income into net income	(1,768)	(2,214)	(2,180)
Interest rate cap agreements | Debt Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of unrealized (losses) gains in OCI on interest rate cap agreements	(21,781)	1,566	(181)
Reclassification from accumulated other comprehensive income into net income	$ 7,081	$ 8,591	$ 8,466

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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