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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
ASSETS    
Gross Amounts $ 114 $ 5,286
Gross Amounts Offset 0 0
Amounts Net of Offset 114 5,286
Financial Collateral 0 0
Net Amount 114 5,286
Derivative contracts - current    
ASSETS    
Gross Amounts 114 5,286
Gross Amounts Offset 0 0
Amounts Net of Offset 114 5,286
Financial Collateral 0 0
Net Amount $ 114 $ 5,286