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Derivatives - Offsetting Assets and Liabilities (Details) - Successor - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
ASSETS    
Derivative assets, gross amounts $ 5,582  
Derivative assets, gross amounts offset (4,272)  
Derivative assets, amounts net of offset 1,310  
Derivative assets, financial collateral 0  
Derivative assets, net amount 1,310  
LIABILITIES    
Derivative liabilities, gross amounts 18,467 $ 29,714
Derivative liabilities, gross amounts offset (4,272) 0
Derivative liabilities, amount net of offset 14,195 29,714
Derivative liabilities, financial collateral (14,195) (29,714)
Derivative liabilities, net amount 0 0
Derivative contracts - current    
ASSETS    
Derivative assets, gross amounts 5,582  
Derivative assets, gross amounts offset (4,272)  
Derivative assets, amounts net of offset 1,310  
Derivative assets, financial collateral 0  
Derivative assets, net amount 1,310  
Derivative contracts - noncurrent    
ASSETS    
Derivative assets, gross amounts 0  
Derivative assets, gross amounts offset 0  
Derivative assets, amounts net of offset 0  
Derivative assets, financial collateral 0  
Derivative assets, net amount 0  
Derivative contracts - current    
LIABILITIES    
Derivative liabilities, gross amounts 14,899 27,538
Derivative liabilities, gross amounts offset (4,272) 0
Derivative liabilities, amount net of offset 10,627 27,538
Derivative liabilities, financial collateral (10,627) (27,538)
Derivative liabilities, net amount 0 0
Derivative contracts - noncurrent    
LIABILITIES    
Derivative liabilities, gross amounts 3,568 2,176
Derivative liabilities, gross amounts offset 0 0
Derivative liabilities, amount net of offset 3,568 2,176
Derivative liabilities, financial collateral (3,568) (2,176)
Derivative liabilities, net amount $ 0 $ 0