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Share-Based and Long-Term Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
May. 14, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   $ 5,100 $ 6,800  
Total compensation expense related to non-vested awards not yet recognized   $ 7,100    
Weighted average period over which expense is expected to be recognized   1 year 2 months    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options granted (in shares)   0    
Average price per option (dollars per share)   $ 4.18   $ 4.17
Time Vesting RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   267,596    
Average price per option (dollars per share)   $ 14.74   16.03
LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   147,302    
Average price per option (dollars per share)   $ 8.58   9.26
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)   $ 13.82   14.61
Deferred Incentive Share Units        
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)   $ 9.86   $ 16.63
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 | 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    
2013 Equity Plan | LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of time-vesting RSUs granted (in shares)   447,938    
Value of time-vesting RSUs outstanding   $ 3,800    
Average price per option (dollars per share)   $ 8.58    
2013 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)   1,850,000    
Award vesting rights (as a percent)   25.00%    
Number of options vested (in shares)   431,250    
Number of options remain unvested (in shares)   862,500    
Value of stock options   $ 3,600    
Average price per option (dollars per share)   $ 4.18    
2013 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)   449,850    
Value of time-vesting RSUs outstanding   $ 8,200    
Average price per option (dollars per share)   $ 18.16    
2013 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)   233,528    
Value of time-vesting RSUs outstanding   $ 1,900    
Average price per option (dollars per share)   $ 8.15    
2010 Equity Plan | Restricted Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   4 years    
Number of time-vesting RSUs granted (in shares)   5,426    
Value of time-vesting RSUs outstanding   $ 75    
Average price per option (dollars per share)   $ 13.82    
2010 Equity Plan | Deferred Incentive Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   4 years    
Number of time-vesting RSUs granted (in shares)   480    
Value of time-vesting RSUs outstanding   $ 5    
Average price per option (dollars per share)   $ 9.86