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Derivatives - Offsetting Assets and Liabilities (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Assets  
Derivative assets, gross amounts $ 5,286
Derivative assets, gross amounts offset 0
Derivative assets, amounts net of offset 5,286
Financial collateral (obligation to return cash) 0
Derivative assets, net amount 5,286
Current assets  
Assets  
Derivative assets, gross amounts 5,286
Derivative assets, gross amounts offset 0
Derivative assets, amounts net of offset 5,286
Financial collateral (obligation to return cash) 0
Derivative assets, net amount $ 5,286