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Share-Based Compensation - Performance Restricted Stock Units Activity (Details) - PRSUs - $ / shares
shares in Thousands
7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
May 31, 2016
Units      
Outstanding at beginning of period: (in shares) 328 290  
Granted (in shares) 105 128  
Performance condition adjustments, net (in shares) (54) (68)  
Released (in shares) (89) (72)  
Forfeited (in shares) 0 0  
Outstanding at end of period: (in shares) 290 278 328
Weighted Average Grant-Date Fair Value      
Outstanding at beginning of period: (in dollars per share) $ 16.01 $ 17.00 $ 17.02
Granted (in dollars per share) 24.90 20.42  
Performance condition adjustments, net (in dollars per share) 24.49 20.55  
Released (in dollars per share) 24.50 15.82  
Forfeited (in dollars per share) 0.00 0.00  
Outstanding at end of period: (in dollars per share) $ 16.01 $ 17.00 $ 17.02