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Employee Benefit Plans - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of active incentive plans   1    
401(k) Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employer matching contribution (as a percent)   50.00%    
Employer matching contribution percent of employees' salary (up to)   5.00%    
2005 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for issuance (in shares) | shares   7,000,000.0    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation | $   $ 1.1 $ 1.3  
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation | $   $ 1.1 1.3  
Share-based payment awards vested (in shares) | shares 589,335      
Award vesting percentage 200.00%      
Vesting period   3 years    
Performance Share Units | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment awards vested (in shares) | shares 1,178,670      
Fair value of awards vested | $ $ 11.4      
Fixed Value Cash Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long-term incentive cash awards granted | $   $ 4.7   $ 4.6
Vesting period   3 years    
Compensation expense | $   $ 1.2 $ 0.8  
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for issuance (in shares) | shares   1,900,000    
Purchase limit per employee (in shares) | shares   260