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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 29, 2016
Mar. 31, 2017
Mar. 31, 2016
Jan. 31, 2017
Dec. 31, 2016
2005 Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuance (in shares)   2,400,000      
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation   $ 2.0 $ 1.4    
Performance Share Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation   2.2 $ 1.0    
Share-based award liability   $ 8.0     $ 7.1
Cash paid to settle share-based award liability       $ 0.6  
ESPP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuance (in shares)   700,000      
Shares authorized for issuance (in shares)   1,500,000      
Purchase limit per employee (in shares) 130