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Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Mar. 15, 2018
Dec. 31, 2017
Nov. 08, 2017
Nov. 07, 2017
Oct. 04, 2017
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Business combination, assets and liabilities assumed, unrecognized stock-based compensation expenses   $ 14,300,000      
Expense for stock-based awards   3,400,000      
Expense for stock-based awards, fair value increase   1,300,000      
Share price     $ 11.00 $ 10.20 $ 10.20
Stock-based awards unrecognized compensation cost   $ 8,900,000      
Stock-based award weighted-average recognition period for unrecognized compensation cost   2 years      
Cash contribution to 401(k) plan   $ 154,000      
Phantom Stock Units          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Liability for phantom stock units   $ 19,500,000      
Granted stock-based awards, subsequent to year-end   0      
Restricted Stock Awards          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Granted stock-based awards, subsequent to year-end   10      
Restricted Stock Awards | Subsequent Event          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Granted stock-based awards, subsequent to year-end 800        
Performance Stock Awards | Subsequent Event          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Granted stock-based awards, subsequent to year-end 400