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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets    
Derivative assets, gross amounts $ 9,833  
Derivative assets, gross amounts offset (3,180)  
Derivative assets, amounts net of offset 6,653  
Derivative assets, financial collateral 0  
Derivative assets, net amount 6,653  
Liabilities    
Derivative liabilities, gross amounts 4,725 $ 29,714
Derivative liabilities, gross amounts offset (3,180) 0
Derivative liabilities, amounts net of offset 1,545 29,714
Derivative liabilities, financial collateral (1,545) (29,714)
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 4,392  
Derivative assets, gross amounts offset (3,180)  
Derivative assets, amounts net of offset 1,212  
Derivative assets, financial collateral 0  
Derivative assets, net amount 1,212  
Noncurrent assets    
Assets    
Derivative assets, gross amounts 5,441  
Derivative assets, gross amounts offset 0  
Derivative assets, amounts net of offset 5,441  
Derivative assets, financial collateral 0  
Derivative assets, net amount 5,441  
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 4,725 27,538
Derivative liabilities, gross amounts offset (3,180) 0
Derivative liabilities, amounts net of offset 1,545 27,538
Derivative liabilities, financial collateral (1,545) (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 liabilities, financial collateral   (2,176)
Derivative liabilities, net amount   $ 0