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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Interest expense	$ (116,604)	$ (64,351)	$ (332,100)	$ (154,078)
Cash Flow Hedging | Interest rate contract
Derivative [Line Items]
Net interest expense on cash flows hedges	(727)	(734)	(2,004)	(2,536)
Interest expense	$ (727)	$ (734)	$ (2,004)	$ (2,536)