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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Period of stock option exercisable 10 years    
Aggregate number of shares 146,000 186,334  
Limit of shares to individual participant in one calendar year 500,000    
Stock options awards 0 0 0
Average contractual life 2 years 8 months 12 days    
Intrinsic value of options exercised $ 1.1 $ 0.8 $ 3.6
Issuance of common stock awards 0.4 0.5 0.5
Total fair value of restricted stock units vested 6.1 4.6 4.0
Unrecognized compensation expense 8.0    
Total weighted average period 2 years 1 month 6 days    
Number of shares available for future grants 267,953    
Range One
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Aggregate number of shares 111,000    
Exercise prices for options outstanding, lower limit $ 14.12    
Exercise prices for options outstanding, upper limit $ 15.61    
Range Two
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Aggregate number of shares 35,000    
Exercise prices for options outstanding, lower limit $ 20.00    
Exercise prices for options outstanding, upper limit $ 24.92    
Stock Options
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense     0.1
Stock Compensation Plan
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense 0.1    
Employee option to purchase common stock 0.5    
Current market value discount rate 20.00%    
Restricted Shares
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense $ 4.7 $ 2.7 $ 2.1
1998 Long Term Incentive Plan
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Aggregate number of shares 3,700,000