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Equity Compensation Plans and Share-Based Compensation Narrative (Details) (USD $)
In Thousands, 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]      
Number of shares available for grant 1,054,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Options and warrants outstanding, intrinsic value $ 50,859    
Options and warrants exercisable, intrinsic value 48,808    
Options and warrants outstanding, weighted average remaining contractual term (years) 3 years    
Options and warrants exercises in period, total intrinsic value 16,878 6,345 17,415
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Fair value assumptions, weighted average fair value of options granted $ 15.27    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Total compensation cost not yet recognized, nonvested stock options 840    
Stock Options and Warrants | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term (years) 10 years    
Stock options
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Fair value assumptions, expected volatility rate 40.00%    
Fair value assumptions, risk free interest rate 1.00%    
Fair value assumptions, expected term (years) 7 years 3 months    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Weighted-average period of recognition (years) 3 years 2 months 12 days    
Stock options | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (years) 5 years    
Stock options | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (years) 10 years    
Nonvested stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period   50,000 50,000
Total intrinsic value for nonvested common stock awards vested during period 1,469 578 930
Total intrinsic value for nonvested common stock awards outstanding 7,602    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Weighted-average period of recognition (years) 2 years 2 months 12 days    
Total compensation cost not yet recognized, nonvested common stock awards $ 5,643    
Measurement period beginning 2012 through 2015 | Nonvested stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period 50,000    
Measurement period beginning 2013 tthrough 2016 | Nonvested stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period 50,000