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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock-Based Compensation        
Share-based compensation, remaining shares available for issuance (in shares) 4,990,354   4,990,354  
Stock-based compensation expense (in dollars) $ 2.2 $ 1.9 $ 8.3 $ 6.0
Director        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0   50,673  
Stock Options        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0   210,243  
Restricted Stock Units (RSUs)        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares) 0   178,371  
Performance Shares        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares) 0   228,037  
Options Granted in 2019 | Stock Options        
Stock-Based Compensation        
Vesting period (in years)     3 years  
Expiration period (in years)     10 years  
2013 Omnibus Plan        
Stock-Based Compensation        
Share-based compensation, shares authorized (in shares) 7,477,395   7,477,395  
Restricted Stock Units 2019 | Restricted Stock Units (RSUs)        
Stock-Based Compensation        
Vesting period (in years)     3 years  
Performance Shares 2019 | 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