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Activity of Hedging Instruments in Accumulated OCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net unrealized loss on hedging instruments at January 1, $ (196,305)  
Unrealized gain (loss) on derivative instruments 211 $ 1,183
Realized losses reclassified into net income (loss) (76) (14)
Net unrealized loss on hedging instruments at March 31, (198,085)  
Accumulated Net Gain (Loss) from Derivative and Nonderivative Instruments Designated as Hedging Instruments [Member]    
Net unrealized loss on hedging instruments at January 1, (13,179) (13,414)
Net unrealized loss on hedging instruments at March 31, $ (13,044) $ (12,245)