Activity of Hedging Instruments in Accumulated OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net unrealized loss on hedging instruments at January 1,	$ (204,672)
Unrealized gain (loss) on derivative instruments	282	$ 211
Realized losses reclassified into net income (loss)	(1,049)	(76)
Net unrealized loss on hedging instruments at March 31,	(229,883)
Accumulated Net Gain (Loss) from Derivative and Nonderivative Instruments Designated as Hedging Instruments [Member]
Net unrealized loss on hedging instruments at January 1,	(15,103)	(13,179)
Net unrealized loss on hedging instruments at March 31,	$ (15,870)	$ (13,044)