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Employee Benefit Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 15, 2019
Jan. 31, 2020
Jan. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of active incentive plans       1    
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized for issuance (in shares) 1,500,000          
Period common stock may be purchased through payroll deductions       4 months    
Percentage of share of non-vested stock considered as call option       85.00%    
Purchase limit per employee (in shares)       260    
Shares available for issuance (in shares)       2,000,000.0    
2005 Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized for issuance (in shares) 7,000,000.0          
Vesting period       3 years    
Award vesting percentage       33.00%    
Shares authorized for issuance (in shares)       17,300,000    
Shares available for issuance (in shares)       8,300,000    
2005 Incentive Plan | Maximum Shares as Incentive Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized for issuance (in shares)       2,000,000.0    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       846,835 614,286 829,143
Granted (in dollars per share)       $ 6.02 $ 7.46 $ 8.39
Share-based compensation       $ 6.2 $ 6.0 $ 7.9
Future share-based compensation       $ 4.2    
Weighted average vesting period (in years)       1 year 3 months 18 days    
Share-based payment awards vested       993,361 823,310 817,791
Fair value of awards vested       $ 6.5 $ 6.4 $ 6.9
Restricted Stock | January 2020 Restricted Stock Grant | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   369,938        
Granted (in dollars per share)   $ 9.63        
Total market value of shares granted   $ 3.6        
PSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Award vesting percentage       100.00%    
Cash paid to settle share-based award liability     $ 11.1      
PSUs | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       200.00%    
PSUs | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       0.00%    
Equity PSU Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       688,540 449,271 671,771
Granted (in dollars per share)       $ 7.60 $ 10.44 $ 12.64
Share-based compensation       $ 5.1 $ 3.8 $ 2.8
Future share-based compensation       $ 4.2    
Weighted average vesting period (in years)       1 year    
Equity PSU Awards | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage   200.00%        
Share-based payment awards vested   589,335        
Equity PSU Awards | Subsequent Event | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based payment awards vested   1,178,670        
Fair value of awards vested   $ 11.4        
Equity PSU Awards | January 2020 PSU Grant | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   369,938        
Granted (in dollars per share)   $ 13.15        
Liability PSU Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation         0.9 4.6
Recorded liability         11.1  
Cash paid to settle share-based award liability         0.9 $ 0.6
Fixed Value Cash Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Long-term incentive cash awards granted       $ 4.6 5.2  
Compensation expense       $ 3.2 $ 1.7  
Fixed Value Cash Awards | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Long-term incentive cash awards granted   $ 4.7        
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 participant' salary (up to)       5.00%    
Plan cost recognized       $ 1.0