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Share-Based and Long-Term Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May. 14, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   $ 1.5 $ 1.7  
Total compensation expense related to non-vested awards not yet recognized   $ 8.7    
Weighted average period over which expense is expected to be recognized   1 year 8 months    
Restricted Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   0    
Average price per option (dollars per share)   $ 0.00   $ 13.65
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options granted (in shares)   0    
Number of options remain unexercised   862,500   1,293,750
Average price per option (dollars per share)   $ 4.17   $ 4.17
LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   206,640    
Average price per option (dollars per share)   $ 6.80   $ 8.58
2015 Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of commons stock (in shares) 2,500,000      
2015 Equity Plan | LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   555,076    
Value of time-vesting RSUs outstanding   $ 3.8    
Average price per option (dollars per share)   $ 6.80    
2015 Equity Plan | 25% per Year in the First Four Years | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options granted (in shares)   1,293,750    
Number of options remain unvested (in shares)   431,250    
Number of options remain unexercised   862,500    
Value of stock options   $ 1.8    
Average price per option (dollars per share)   $ 4.17    
2015 Equity Plan | 25% per Year in the First Four Years | Time Vesting RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   536,764    
Value of time-vesting RSUs outstanding   $ 8.3    
Average price per option (dollars per share)   $ 15.51    
2015 Equity Plan | Performance | Time Vesting RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   336,240    
Value of time-vesting RSUs outstanding   $ 2.1    
Average price per option (dollars per share)   $ 6.20    
2015 Equity Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   3 years    
2015 Equity Plan | Minimum | Performance        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   1 year