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Equity Compensation Plans and Share-Based Compensation Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 1,074,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Options and warrants outstanding, intrinsic value $ 44,098,000    
Options and warrants exercisable, intrinsic value 41,741,000    
Options and warrants outstanding, weighted average remaining contractual term (years) 2 years 2 months 12 days    
Options and warrants exercises in period, total intrinsic value 22,375,000 16,878,000 6,345,000
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 680,000    
Income tax benefit from exercise of stock options and warrants (value) 1,288,000 0 0
Stock Options and Warrants | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 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) 2 years 6 months    
Stock options | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Award vesting period (years) 5 years    
Stock options | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Award vesting period (years) 10 years    
Nonvested stock
     
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Shares issued in period 1,000   50,000
Total intrinsic value for nonvested common stock awards vested during period 224,000 1,469,000 578,000
Total intrinsic value for nonvested common stock awards outstanding 7,229,000    
Weighted-average period of recognition (years) 1 year 10 months 24 days    
Total compensation cost not yet recognized, nonvested common stock awards $ 4,253,000    
Nonvested stock | Measurement period beginning 2012 through 2015
     
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Shares issued in period   50,000  
Nonvested stock | Measurement period beginning 2013 tthrough 2016
     
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Shares issued in period   50,000