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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock-Based Compensation        
Share-based compensation, remaining shares available for issuance (in shares) 4,179,107   4,179,107  
Stock-based compensation (income) expense (in dollars) $ 2.3 $ 2.5 $ 4.8 $ 5.9
Director        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0 0 56,672 77,608
Stock Options        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0 0 0 250,432
Stock Options | Options Granted in 2020        
Stock-Based Compensation        
Vesting period (in years)     3 years  
Expiration period (in years)     10 years  
Stock Options | Options Granted in 2019        
Stock-Based Compensation        
Vesting period (in years)       3 years
Expiration period (in years)       10 years
Restricted Stock Units        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 750 28,070 317,724 305,519
Vesting period (in years)     3 years  
Performance Shares        
Stock-Based Compensation        
Number of share options granted during the period (in shares) 0 6,711 203,697 328,310
Vesting period (in years)     3 years  
2013 Omnibus Plan        
Stock-Based Compensation        
Share-based compensation, shares authorized (in shares) 7,477,395   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)     60.00%  
Percentage of shares paid based on adjusted EBITDA (as a percent)     40.00%  
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% 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)     200.00% 200.00%
Percentage of shares paid based on adjusted EBITDA (as a percent)       100.00%
Performance period (in years)     3 years 3 years