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Stock Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock authorized and reserved for issuances 3,360      
Shares authorized but not issued 2,014      
Expiration period of SOSARs 7 years      
Stock-based compensation expense $ 64,781 $ 66,274 $ 42,965  
Stock-based compensation expense, net of tax 39,465 40,361 26,166  
Change in estimate expense non-vested stock awards   5,578    
Change in estimate expense non-vested stock awards, net of tax   3,397    
Change in estimate expense non-vested stock awards, earnings per share   $ 0.11    
Stock only stock appreciation rights (SOSARs) granted 672 617 587  
Total intrinsic value of options and SOSARs exercised 91,178 183,097 113,752  
Outstanding, end of year, shares 71 120 207 205
Cumulative cash flow from operations measurement period 3 years      
Shares vested, fair value 58,941 31,309 961  
Stock Options And SOSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unearned compensation 31,912      
Weighted average period 1 year 4 months      
Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, end of year, shares 66      
Performance SOSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock only stock appreciation rights (SOSARs) granted 191      
Non-Vested Stock Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unearned compensation 26,357      
Weighted average period 2 years 8 months      
Leasehold Improvements [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation recognized as capitalized development $ 1,124 $ 1,998 $ 1,583  
First Half Vested [Member] | Alternative 2 [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] | Alternative 2 [Member] | Stock Options And SOSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for SOSARs 3 years