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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares under the plan 2,500,000    
Vesting period 4 years    
Share-based compensation expense $ 2.2 $ 2.2 $ 2.5
Income tax benefit recognized $ 0.9 $ 0.9 $ 0.9
Options exercisable 198,867 95,259 289,367
Exercisable options, weighted average exercise price $ 10.34    
Total unrecognized compensation cost $ 2.1 $ 1.0  
Exercisable options, intrinsic value $ 0.00    
Weighted average remaining contractual terms options exercisable 5 years    
Granted 564,000 650,000  
Unvested (in shares) 1,050,666    
Accounting Standards Update 2016-09 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recorded tax deficiencies on vested shares in benefit from income taxes $ 0.4    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Expiration period 4 years    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Expiration period 7 years    
2010 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Equity Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Equity Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
GTS Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
GTS Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
GTS Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding 358,087 274,764 208,775
Total unrecognized compensation cost $ 2.5 $ 2.8  
Granted 271,279 190,179