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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-Based Compensation        
Share-based compensation, remaining shares available for issuance (in shares) 4,981,582   4,981,582  
Stock-based compensation expense (in dollars) $ 3.0 $ 1.6 $ 6.1 $ 4.1
Director        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0 0 50,673 22,936
Stock Options        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0 24,208 210,243 187,484
Restricted Stock Units (RSUs)        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares) 2,000 26,710 178,371 57,930
Performance Shares        
Stock-Based Compensation        
Number of shares of other than options granted during the period (in shares) 0 15,425 228,037 93,298
Options Granted in 2019 | Stock Options        
Stock-Based Compensation        
Vesting period (in years)     3 years  
Expiration period (in years)     10 years  
Options Granted in 2018 | 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  
Performance Shares 2018 | 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