Derivative Instruments - Gain (Loss) On Derivative Instruments (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Dec. 31, 2016 |
Oct. 10, 2016 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Net gain (loss) on derivative instruments | $ (1,548) | $ 15,336 | $ 5,138 | |
| Predecessor | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Net gain (loss) on derivative instruments | $ (6,838) | |||