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Stock-Based Payments (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2008
Vesting percentage after one year 25.00%     20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 91,800,000      
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, Weighted Average Period of Recognition, years 2 years 1 month      
Stock options, granted, shares 0      
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value   $ 13 $ 19  
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value 35,300,000 19,000,000 4,200,000  
Share-based compensation arrangement by share-based payment award, vesting period lower range 2 years      
Share-based compensation arrangement by share-based payment award, vesting period upper range 4 years      
Granted performance shares 143,134      
Granted performance shares, value 10,400,000      
Restricted Class A common stock, fair value 31,900,000 20,900,000 11,600,000  
Total expense for stock payments 54,400,000 61,400,000 51,300,000  
Share-based compensation arrangement by share-based payment award, discount from market price 90.00%      
Class A common stock issued to participating employees 18,632 27,768 32,085  
Employee Stock Purchase Plan; Class A Shares [Member]
       
Total expense for stock payments 100,000 100,000 200,000  
Director Stock Plan; Class A Shares [Member]
       
Total expense for stock payments 2,100,000 2,200,000 2,100,000  
Annual award of class A common stock value 75,000      
Annual stipend allowance in shares of stock 25,000      
Annual stipend allowance in shares of stock (in shares) 27,168 40,260 40,585  
Class A Common Stock (Shares) [Member]
       
Stock options, granted, shares 799,978      
Restricted Class A common stock, fair value $ 57,400,000      
Restricted Stock Units (RSUs) [Member]
       
Stock options, granted, shares 4,984      
Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   4.20% 1.20%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   40.00% 41.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   0.80% 2.00%  
Share-based compensation arrangements expected life   5.0 5.6  
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   4.50% 2.40%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   41.00% 42.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.50% 2.30%  
Share-based compensation arrangements expected life   6.2 6.2