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Accounting for Stock-Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 08, 2010
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Total Shares authorized 70,000,000 70,000,000    
Fair value of stock awards historical Period 10 years      
Employee [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Issuance of shares pursuant to vesting of restricted stock units, Shares 1      
Maximum [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Annualized forfeiture rates 6.10%      
Minimum [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Annualized forfeiture rates 4.40%      
Stock Incentive Plan [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Additional shares authorized     1,800,000  
Total Shares authorized       2,700,000
Stock-based compensation expense $ 8.8 $ 6.7 $ 7.5  
Unrecognized compensation expense related to unvested stock-based compensation agreements 18.0      
Unrecognized compensation expense period for recognition 2 years 4 months 24 days      
Stock Options [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Stock-based compensation expense 1.4 1.1 0.6  
Unrecognized compensation expense related to unvested stock-based compensation agreements 2.2      
Contractual term period 10 years      
Expected life   5 years 7 months 6 days    
Volatility rate   42.30%    
Risk free rate of return   2.20%    
Closing stock price $ 23.44      
Weighted average grant date fair value $ 9.77 $ 9.18    
Weighted Average remaining contractual terms for options vested and expected to vest 7 years 2 months 12 days 5 years 7 months 6 days    
Stock Options [Member] | Maximum [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Expected life 5 years 4 months 24 days   5 years 6 months  
Volatility rate 42.30%   45.70%  
Risk free rate of return 1.10%   2.60%  
Vesting period 4 years      
Stock Options [Member] | Minimum [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Expected life 5 years 1 month 6 days   5 years 1 month 6 days  
Volatility rate 41.00%   45.00%  
Risk free rate of return 0.70%   2.30%  
Vesting period 3 years      
Restricted Stock Awards [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Stock-based compensation expense 0.8 0.8 0.6  
Unrecognized compensation expense related to unvested stock-based compensation agreements 0.4      
Unrecognized compensation expense period for recognition 4 months 24 days      
Closing stock price $ 23.44      
Issuance of shares pursuant to vesting of restricted stock units, Shares 36,139      
Weighted-Average Grant Date Fair Value, Granted $ 22.41 $ 24.32 $ 24.38  
Vesting period 1 year      
Restricted Stock Units [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Stock-based compensation expense 6.6 4.8 6.3  
Unrecognized compensation expense related to unvested stock-based compensation agreements 15.5      
Unrecognized compensation expense period for recognition 2 years 4 months 24 days      
Closing stock price $ 23.44      
Issuance of shares pursuant to vesting of restricted stock units, Shares 374,868      
Weighted-Average Grant Date Fair Value, Granted $ 25.42 $ 21.69 $ 24.90  
Vesting period 4 years      
Aggregate intrinsic value $ 18.9      
Restricted Stock Units [Member] | Maximum [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Vesting period 4 years      
Restricted Stock Units [Member] | Minimum [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Vesting period 3 years      
Omnibus Plan [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Shares deducted from plan     1.9  
Omnibus Plan [Member] | Stock Incentive Plan [Member]
       
Accounting for Stock-Based Compensation (Textual) [Abstract]        
Shares available for grant 1,000,000