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Derivative Instruments and Hedging Activities - Components of Investment Fair Value Changes (Details) - Trading - Interest Rate Swap
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Realized Gains (Losses) $ (73,078)
Unrealized Gains (Losses) $ 28,967