Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Total interest expense	$ (102,666)	$ (116,220)	$ (249,337)	$ (215,496)
Cash Flow Hedging | Interest rate contract
Derivative [Line Items]
Net interest expense on cash flows hedges	0	(640)	(860)	(1,277)
Realized net losses reclassified from other comprehensive income	(1,029)	0	(1,108)	0
Total interest expense	$ (1,029)	$ (640)	$ (1,968)	$ (1,277)