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Employee Benefit Plans - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
May 15, 2019
shares
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of active incentive plans     1      
2005 Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized for issuance (in shares) | shares         7,000,000.0  
Shares available for issuance (in shares) | shares 8,500,000   8,500,000      
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation | $ $ 2.4 $ 1.5 $ 3.7 $ 3.0    
Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation | $ 1.4 4.2 $ 2.7 5.2    
Share-based award liability | $           $ 11.1
Vesting period     3 years      
Fixed Value Cash Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Long-term incentive cash awards granted | $ 4.6   $ 4.6     $ 5.2
Vesting period     3 years      
Compensation expense | $ $ 0.8 $ 0.4 $ 1.6 $ 0.8    
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized for issuance (in shares) | shares         1,500,000  
Shares available for issuance (in shares) | shares 2,000,000.0   2,000,000.0      
Purchase limit per employee (in shares) | shares     130