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Stock Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise Price   $ 318.45      
Grant date fair value   $ 82.03      
Stock-based compensation expense $ 16,567   $ 15,039 $ 51,465 $ 53,844
Stock-based compensation expense, net of tax 10,069   9,171 31,280 32,834
Stock only stock appreciation rights (SOSARs) granted   662      
Options or SOSARs exercised       245  
SOSARs forfeited       55  
Non-vested stock awards vested       6  
Performance SOSARs [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock only stock appreciation rights (SOSARs) granted   191      
Leasehold Improvements [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation recognized as capitalized development $ 278   $ 464 $ 843 $ 1,592
First Half Vested [Member] | Stock Options And SOSARs [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period for SOSARs   2 years      
Second Half Vested [Member] | Stock Options And SOSARs [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period for SOSARs   3 years