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Stock Option Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 5,433 $ 4,933 $ 3,279
Stock-based compensation recognized tax benefits 7,879 796 30
Total share-based compensation 3,660    
Share-based compensation expected period of recognition 2.1    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at beginning of period, shares 1,581,000 1,491,000  
Outstanding at beginning of period, price $ 11.68 $ 10.39  
Granted, shares 150,000 250,000  
Granted, price $ 36.75 $ 17.27  
Exercised (724,000) (143,000)  
Exercised, price $ 9.72 $ 7.42  
Expired or forfeited, shares (29,000) (17,000)  
Expired or forfeited, price $ 21.27 $ 17.35  
Outstanding at end of period, shares 978,000 1,581,000 1,491,000
Outstanding at end of period, price $ 16.69 $ 11.68 $ 10.39
Exercisable at end of year, shares 563,000 [1] 1,118,000 [1]  
Exercisable at end of year, price $ 11.72 $ 9.46  
Participants at end of year 73 65  
Available for future grants at end of year 533,000 795,000  
Remaining contractual term (in years) 7.0    
Intrinsic value of the options oustanding 36,558 34,940  
Intrinsic value of the options exercisable 23,801 27,190  
Total fair value of options vested 1,957 1,755 1,421
Total intrinsic value of options exercised in period 28,784 3,327 594
Weighted average grant date fair value $ 24.33 $ 12.03 $ 11.02
Expected term (years) 6.25 6.25 6.25
Risk-free interest rate 2.43% 2.46% 2.07%
Expected volatility 72.47% 77.84% 74.87%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 978,000 1,581,000 1,491,000
Stock Options [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Award vesting period 4 years    
Stock Options [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Award vesting period 5 years    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 2,198 1,162  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted in period 59,000 192,000  
Award vesting period 3 years   3 years
Weighted-average per share fair values $ 36.75 $ 17.85  
Performance Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Weighted average per share fair value $ 36.75   $ 5.26
Award vesting period 3 years   3 years
Performance Share Units [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Percent of total shared units earned out of total share units granted 0.00%    
Performance Share Units [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Percent of total shared units earned out of total share units granted 150.00%    
Stock Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance 3,421,000    
Stock Incentive Plan [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at end of period, shares 632,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 632,000    
Stock Incentive Plan [Member] | Performance Based Stock Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards oustanding 145,000    
Omnibus Equity Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance 1,250,000    
Omnibus Equity Plan [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at end of period, shares 348,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 348,000    
Omnibus Equity Plan [Member] | Performance Based Stock Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards oustanding 56,000    
Omnibus Equity Plan [Member] | Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards oustanding 172,000    
Omnibus Equity Plan [Member] | Performance Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted in period 59,000   164,000
Director [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 360 330 300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted in period 8,000 18,000 24,000
Fair market value of stock awards $ 360 $ 330 $ 300
[1] Remaining contractual term of 7.0 years