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Derivative Instruments - Realized and Unrealized Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments: - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Unrealized (Loss) Gain $ (25,354) $ 4,022 $ (41,883)
Realized (Loss) Gain (626) 4,278 130,359
Total (Loss) Gain (25,980) 8,300 88,476
Contingent redemption features - Series A Preferred      
Derivative [Line Items]      
Unrealized (Loss) Gain 0 0 (42,140)
Realized (Loss) Gain 0 0 140,320
Total (Loss) Gain 0 0 98,180
Cross currency and interest rate swaps      
Derivative [Line Items]      
Unrealized (Loss) Gain (25,354) 4,022 257
Realized (Loss) Gain (626) 4,278 (9,961)
Total (Loss) Gain $ (25,980) $ 8,300 $ (9,704)