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Derivative Instruments Derivative Instruments - Reconciles Net Amounts Derivative Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative assets $ 0 $ 15,612
Noncurrent derivative assets 0 0
Derivative assets, Net amounts of assets on balance sheet 0 15,612
Derivative liabilities 0 0
Noncurrent derivative liabilities 0 0
Derivative liability, Net amounts of liabilities on balance sheet 0 0
Total derivative assets, net $ 0 $ 15,612