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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Stock-Based Compensation    
Share-based compensation, remaining shares available for issuance (in shares) 4,603,138  
Stock-based compensation expense (in dollars) $ 3.4 $ 3.1
Director    
Stock-Based Compensation    
Number of share options granted during the period (in shares) 77,608 50,673
Stock Options    
Stock-Based Compensation    
Number of share options granted during the period (in shares) 250,432 210,243
Restricted Stock Units    
Stock-Based Compensation    
Vesting period (in years) 3 years  
Number of shares of other than options granted during the period (in shares) 277,449 176,371
Performance Shares    
Stock-Based Compensation    
Vesting period (in years) 3 years  
Number of shares of other than options granted during the period (in shares) 321,599 228,037
Options Granted in 2020 | Stock Options    
Stock-Based Compensation    
Vesting period (in years) 3 years  
Expiration period (in years) 10 years  
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  
Performance Shares 2020 | Performance Shares    
Stock-Based Compensation    
Percentage of shares paid based on total shareholder return relative to defined peer group (as a percent) 100.00%  
Percentage of shares paid based on adjusted EBITDA (as a percent) 100.00%  
Performance period (in years) 3 years  
Increase decrease in percentage of shares paid based on total shareholder return relative to defined peer group 20.00%  
Performance Shares 2019 | Performance Shares    
Stock-Based Compensation    
Percentage of shares paid based on total shareholder return relative to defined 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