Derivatives and Hedging - Derivative Gains And Losses That Have Been Recognized In Condensed Consolidated Statements Of Operations (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total expense (income), net		$ 47,180	$ (873)	$ 8,445
Repayments of long-term debt		2,058,469	102,579	570,972
Gain on de-designated swaps		2,157	0	0
Secured Debt | 2016 Credit Facility Agreement | Term Loan A
Derivative Instruments, Gain (Loss) [Line Items]
Repayments of long-term debt	$ 787,900
Interest (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Total expense (income), net		24,880	3,361	(1,920)
Other expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Total expense (income), net		22,300	$ 2,488	$ 10,365
Other Expense | Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Total expense (income), net		(10,300)
Loss on release of interest rate swap recognized in earnings		10,300
Gain on de-designated swaps		$ (2,200)