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Deferred compensation (2010 Equity Incentive Plan) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 21, 2017
Sep. 30, 2017
Stock-Based Compensation [Line Items]    
Estimated fair value per share at end of period ($ per share)   $ 23.25
Predecessor | Restricted Stock | 2010 Equity Incentive Plan | Common Class A    
Stock-Based Compensation [Line Items]    
Shares reserved for issuance under the 2010 Plan 86,301  
Predecessor | Restricted Stock | 2010 Equity Incentive Plan | Common Class A | Service Vesting Conditions    
Stock-Based Compensation [Line Items]    
Estimated fair value per share at end of period ($ per share) $ 0.00  
Weighted average grant date fair value    
Unvested and outstanding at beginning of period ($ per share) 790.91 $ 790.91
Granted ($ per share) 0  
Vested ($ per share) 812.91  
Forfeited ($ per share) 785.70  
Cancelled ($ per share) $ 775.66  
Shares    
Unvested and outstanding at beginning of period (in shares) 6,667 6,667
Granted (in shares) 0  
Vested (in shares) (2,602)  
Forfeited (in shares) (468)  
Cancelled (in shares) (3,597)  
Vest date fair value    
Vest date fair value $ 0  
Predecessor | Restricted Stock | 2010 Equity Incentive Plan | Common Class A | Performance Vested    
Weighted average grant date fair value    
Unvested and outstanding at beginning of period ($ per share) $ 277.33 $ 277.33
Granted ($ per share) 0  
Vested ($ per share) 0  
Forfeited ($ per share) 195.75  
Cancelled ($ per share) $ 281.26  
Shares    
Unvested and outstanding at beginning of period (in shares) 21,475 21,475
Granted (in shares) 0  
Vested (in shares) 0  
Forfeited (in shares) (986)  
Cancelled (in shares) (20,489)