Derivative Instruments - Location and Amounts of Interest Rate Swap Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap gains (losses)	$ (32,047)	$ (11,912)
Derivatives Not Designated as Hedging Instruments | Net unrealized loss on financial instruments | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap gains (losses)	(32,443)	(12,209)
Derivatives Not Designated as Hedging Instruments | Financing interest expense | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap gains (losses)	$ (792)	$ 2,116