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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
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)   7,000,000.0   7,000,000.0    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation   $ 1.1 $ 1.2 $ 3.2 $ 4.9  
Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation   1.0 1.2 $ 3.0 3.9  
Share-based payment awards vested (in 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) 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   $ 4.7   $ 4.6
Vesting period       3 years    
Compensation expense   $ 1.1 $ 0.8 $ 3.4 $ 2.4  
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (in shares)   1,800,000   1,800,000    
Purchase limit per employee (in shares)       260