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Share-based Compensation Stock Options (Details) (USD $)
In Thousands, except Per 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]      
Share-based Compensation Expense $ 9,989 $ 7,461 $ 5,433
Tax benefit from exercise of stock options 6,673 8,972 7,879
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 9,146    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 321 days    
Director [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Fair market value of stock awards 393 368 360
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 2,222    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 106 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at beginning of period, shares 749    
Outstanding at beginning of period, price $ 24.21    
Granted, shares 82    
Granted, price $ 68.21    
Exercised (315)    
Exercised, price $ 16.97    
Expired or forfeited, shares (6)    
Expired or forfeited, price $ 43.17    
Outstanding at end of period, shares 510 749  
Outstanding at end of period, price $ 35.54 $ 24.21  
Exercisable at end of year, shares 236    
Exercisable at end of year, price $ 21.61    
Remaining contractual term (in years) 6 years 190 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 504    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 35.27    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 30,446    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 6 years 179 days    
Intrinsic value of the options oustanding 30,676    
Intrinsic value of the options exercisable 17,460    
Total intrinsic value of options exercised in period 21,199 18,310 28,784
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 2,673 2,216 1,957
Weighted average grant date fair value $ 41.52 $ 35.69 $ 24.33
Expected term (years) 6 years 3 months 6 years 3 months 6 years 3 months
Risk-free interest rate 1.00% 1.15% 2.43%
Expected volatility 66.80% 70.71% 72.47%
Award vesting period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 510 749  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 51 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Contractual Term 10 years    
Stock Options [Member] | Stock Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at end of period, shares 139    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 139    
Stock Options [Member] | Omnibus Equity Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at end of period, shares 371    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 371    
Performance Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Award vesting period 3 years    
Additional Paid-in Capital [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit from exercise of stock options $ 6,673 $ 8,972 $ 7,879
Maximum [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Award vesting period 5 years