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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 20, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
May 07, 2013
Stock-Based Compensation            
Stock-based compensation expense (in dollars)   $ 1.5 $ 1.0 $ 4.7 $ 3.8  
Number of share options granted during the period (in shares)   0 0 1,100,000 1,800,000  
Restricted Stock Units (RSUs)            
Stock-Based Compensation            
Number of shares of other than options granted during the period (in shares)   0 0 500,000 600,000  
Restricted Stock Units (RSUs) | Officers And Employees | Minimum            
Stock-Based Compensation            
Expiration period of restrictions (in years)       1 year    
Restricted Stock Units (RSUs) | Officers And Employees | Maximum            
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    
Performance Shares            
Stock-Based Compensation            
Number of shares of other than options granted during the period (in shares)   0 0 500,000 800,000  
Options Granted in 2017 | Stock Options            
Stock-Based Compensation            
Vesting period (in years)       3 years    
Expiration period (in years)       10 years    
Options Granted 2016 | Stock Options            
Stock-Based Compensation            
Vesting period (in years)         4 years  
Expiration period (in years)         10 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          
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%  
Performance period (in years)         3 years  
Percentage of shares paid based on weighted average return on investment (as a percent)         50.00%  
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