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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Assets    
Derivative assets, gross amounts $ 25,363  
Derivative assets, gross amounts offset (57)  
Derivative assets, amounts net of offset 25,306  
Derivative, Collateral, Obligation to Return Cash 0  
Derivative assets, net amount 25,306  
Liabilities    
Derivative liabilities, gross amounts 57 $ 29,714
Derivative liabilities, gross amounts offset (57) 0
Derivative liabilities, amounts net of offset 0 29,714
Derivative, Collateral, Right to Reclaim Cash 0 29,714
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 17,885  
Derivative assets, gross amounts offset (57)  
Derivative assets, amounts net of offset 17,828  
Derivative, Collateral, Obligation to Return Cash 0  
Derivative assets, net amount 17,828  
Noncurrent assets    
Assets    
Derivative assets, gross amounts 7,478  
Derivative assets, gross amounts offset 0  
Derivative assets, amounts net of offset 7,478  
Derivative, Collateral, Obligation to Return Cash 0  
Derivative assets, net amount 7,478  
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 57 27,538
Derivative liabilities, gross amounts offset (57) 0
Derivative liabilities, amounts net of offset 0 27,538
Derivative, Collateral, Right to Reclaim Cash 0 27,538
Derivative liabilities, net amount $ 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts   2,176
Derivative liabilities, gross amounts offset   0
Derivative liabilities, amounts net of offset   2,176
Derivative, Collateral, Right to Reclaim Cash   2,176
Derivative liabilities, net amount   $ 0