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Deferred compensation (Phantom stock plan and restricted stock unit plan) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Jan. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated fair value per share at end of period (in dollars per share) $ 4.92  
Phantom Stock Plan | Predecessor | Phantom Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period (in years) 5 years  
Days from vesting date to cash settlement 120 days  
Unvested and outstanding restricted stock units (in shares)   0
Restricted Stock Unit Plan | Predecessor | RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Days from vesting date to cash settlement 120 days  
Unvested and outstanding restricted stock units (in shares)   98,596
Restricted Stock Unit Plan | Predecessor | RSUs | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period (in years) 3 years  
Phantom Stock Plan and Restricted Stock Unit Plan | Predecessor | Phantom Stock and RSU    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated fair value per share at end of period (in dollars per share)   $ 0.00