Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Total interest expense	$ (100,411)	$ (116,604)	$ (349,748)	$ (332,100)
Cash Flow Hedging | Interest rate contract
Derivative [Line Items]
Net interest expense on cash flows hedges	0	(727)	(860)	(2,004)
Realized net losses reclassified from other comprehensive income	(1,040)	0	(2,148)	0
Total interest expense	$ (1,040)	$ (727)	$ (3,008)	$ (2,004)