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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 0.7 $ 0.5 $ 0.5
Income tax benefit recognized 0.3 0.2 0.2
Options exercisable 1,563,725 1,684,140 1,638,623
Exercisable options, weighted average exercise price $ 11.67    
Unrecognized compensation cost, period for recognition 4 years    
Exercisable options, contractual term 3 years 9 months 18 days    
Exercisable options, intrinsic value $ 6.47    
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
2010 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares under the plan     2,500,000
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    
Restricted stock units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost 1.8 0.8  
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost $ 0.1    
Restricted stock units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding 142,248 75,922 0
Restricted stock units | 2010 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years