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Derivative Instruments - Gain (Loss) On Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain (loss) on derivative instruments $ (896)   $ 5,392  
Predecessor        
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain (loss) on derivative instruments   $ 1,741   $ (4,184)