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Derivative Instruments and Hedging Activities - Components of Realized and Unrealized Gains and Losses (Details) - Interest rate swaps - Not Designated as Hedging Instrument, Trading - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Realized Gains (Losses) $ (73,078) $ 0
Unrealized Gains (Losses) $ 28,967 $ (30,722)