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Other Assets (Derivative Instruments Balance Sheet Location) (Details) - Swaps - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Hedging    
Derivative Instruments    
Notional amount of derivative liabilities $ 0 $ 2,942,000
Derivative liabilities, at fair value 0 0
Non-Hedging    
Derivative Instruments    
Notional amount of derivative liabilities 0 230,000
Derivative liabilities, at fair value $ 0 $ 0