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Deferred compensation (Stock-based compensation cost) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 21, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Stock-Based Compensation [Line Items]              
Stock-based compensation cost (credit) $ 3,577     $ 3,577      
Less: stock-based compensation cost capitalized (801)     (801)      
Stock-based compensation expense (credit) $ 2,776     $ 2,776      
Market price per share of common stock $ 23.25     $ 23.25 $ 23.25    
Aggregate intrinsic value of unvested restricted shares outstanding $ 41,779     $ 41,779 $ 41,779    
Stock-based compensation costs included in accrued payroll and benefits payable 0     0 0   $ 0
Unrecognized stock-based compensation cost $ 25,805     $ 25,805 $ 25,805    
Weighted-average period for unrecognized compensation cost to be recognized         1 year 6 months    
Predecessor              
Stock-Based Compensation [Line Items]              
Stock-based compensation cost (credit)   $ 194 $ (5,705)     $ (6,220)  
Less: stock-based compensation cost capitalized   (39) 1,167     965  
Stock-based compensation expense (credit)   $ 155 $ (4,538)     (5,255)  
Payments for stock-based compensation           $ 49