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Other Assets (Derivative Instruments - Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Swap | Non-Hedging    
Derivative Instruments    
Notional amount of derivative assets $ 230,000 $ 595,000
Derivative assets, fair value 0 0
Swaps | Hedging    
Derivative Instruments    
Notional amount of derivative assets 2,922,000 2,622,000
Derivative assets, fair value $ 0 $ 0