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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 20, 2016
Mar. 31, 2017
Mar. 31, 2016
May 07, 2013
Stock-Based Compensation        
Stock-based compensation expense (in dollars)   $ 2.2 $ 1.3  
Restricted Stock Units (RSUs)        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares)   1,000,000 1,300,000  
Restricted Stock Units (RSUs) | Officers and Employees        
Stock-Based Compensation        
Expiration period of restrictions (in years)   3 years    
Restricted Stock Units (RSUs) | Director        
Stock-Based Compensation        
Expiration period of restrictions (in years)   2 years    
2013 Omnibus Plan        
Stock-Based Compensation        
Share-based compensation, shares authorized (in shares)       8,000,000
Additional shares authorized (in shares) 22,100,000.0      
Performance Shares 2017 | Performance Shares        
Stock-Based Compensation        
Percentage of shares paid based on total shareholder return relative to peer group (as a percent)   50.00%    
Percentage of shares paid based on adjusted EBITDA (as a percent)   50.00%    
Performance period (in years)   3 years    
Performance Shares 2017 | Performance Shares | Minimum        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares)   0    
Performance Shares 2017 | Performance Shares | Maximum        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares)   900,000    
Performance Shares 2016 | Performance Shares        
Stock-Based Compensation        
Percentage of shares paid based on total shareholder return relative to peer group (as a percent)     50.00%  
Percentage of shares paid based on weighted average return on investment (as a percent)     50.00%  
Performance period (in years)   3 years    
Performance Shares 2016 | Performance Shares | Minimum        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares)     0  
Performance Shares 2016 | Performance Shares | Maximum        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares)     1,200,000  
Options Granted in 2017        
Stock-Based Compensation        
Number of share options granted during the period (in shares)   1,100,000    
Options Granted in 2017 | Stock Options        
Stock-Based Compensation        
Exercisable increment (as a percent)   33.00%    
Vesting period (in years)   3 years    
Expiration period (in years)   10 years    
Options Granted 2016        
Stock-Based Compensation        
Number of share options granted during the period (in shares)     1,700,000  
Options Granted 2016 | Stock Options        
Stock-Based Compensation        
Exercisable increment (as a percent)     25.00%  
Vesting period (in years)     4 years  
Expiration period (in years)     10 years