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Derivatives - Offsetting Assets and Liabilities (Details) - Successor - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets    
Derivative assets, gross amounts $ 9,641  
Derivative assets, gross amounts offset (1,023)  
Derivative assets, amounts net of offset 8,618  
Financial collateral (obligation to return cash) 0  
Derivative assets, net amount 8,618  
Liabilities    
Derivative liabilities, gross amounts 1,031 $ 29,714
Derivative liabilities, gross amounts offset (1,023) 0
Derivative liabilities, amounts net of offset 8 29,714
Financial collateral (right to reclaim cash) (8) (29,714)
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 7,632  
Derivative assets, gross amounts offset (1,024)  
Derivative assets, amounts net of offset 6,608  
Financial collateral (obligation to return cash) 0  
Derivative assets, net amount 6,608  
Noncurrent assets    
Assets    
Derivative assets, gross amounts 2,009  
Derivative assets, gross amounts offset 1  
Derivative assets, amounts net of offset 2,010  
Financial collateral (obligation to return cash) 0  
Derivative assets, net amount 2,010  
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 1,031 27,538
Derivative liabilities, gross amounts offset (1,023) 0
Derivative liabilities, amounts net of offset 8 27,538
Financial collateral (right to reclaim cash) (8) (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
Financial collateral (right to reclaim cash)   (2,176)
Derivative liabilities, net amount   $ 0