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Fair value measurements (Level 3 rollforward) (Details) - Recurring Fair Value Measurements - Level 3 - Derivative - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 21, 2017
Dec. 31, 2017
Dec. 31, 2018
Level 3 Rollforward      
Beginning balance   $ 715 $ (295)
Realized and unrealized (losses) gains included in non-hedge derivative (losses) gains   (1,010) (1,101)
Settlements received   0 1,426
Ending balance $ 715 (295) 30
(Losses) gains relating to instruments still held at the reporting date included in non-hedge derivative (losses) gains for the period   (1,010) $ 30
Predecessor      
Level 3 Rollforward      
Beginning balance (98) $ 715  
Realized and unrealized (losses) gains included in non-hedge derivative (losses) gains 813    
Settlements received 0    
Ending balance 715    
(Losses) gains relating to instruments still held at the reporting date included in non-hedge derivative (losses) gains for the period $ 813