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Share-based Compensation Performance Units (Details) (USD $)
In Thousands, except 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]      
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    
Performance Based Stock Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, shares 86,000 68,000  
Nonvested, Weighted Average Grant Date Fair Value $ 46.94 $ 41.07  
Granted, shares 19,000    
Granted, Weighted Average Grant Date Fair Value $ 68.21 $ 55.93 $ 36.45
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   9,386  
Forfeited, shares (1,000)    
Forfeitured, Weighted Average Grant Date Fair Value $ 36.45    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2,597    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 259 days    
Performance Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
2011 PSU [Member] | Performance Share Units [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Share Units Earned Out Of Performance Share Units Granted 0.00%    
2011 PSU [Member] | Performance Share Units [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Share Units Earned Out Of Performance Share Units Granted 150.00%    
2012 PSU [Member] | Performance Share Units [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Share Units Earned Out Of Performance Share Units Granted 0.00%    
2012 PSU [Member] | Performance Share Units [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Share Units Earned Out Of Performance Share Units Granted 200.00%    
2013 PSU [Member] | Performance Share Units [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Share Units Earned Out Of Performance Share Units Granted 0.00%    
2013 PSU [Member] | Performance Share Units [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Share Units Earned Out Of Performance Share Units Granted 200.00%