Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details)

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Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative assets, at fair value $ 188,051 $ 319,981
Derivative liabilities, at fair value $ (6,740) $ (820,590)