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Stock-Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
ShareBasedCompensationPlan
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Employee Stock Option [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
2010 Plan [Member]
Dec. 31, 2013
2010 Plan [Member]
Class A Common Stock [Member]
May 20, 2010
2010 Plan [Member]
Class A Common Stock [Member]
Dec. 31, 2013
2008 Plan [Member]
Dec. 31, 2012
2008 Plan [Member]
Dec. 31, 2011
2008 Plan [Member]
Dec. 31, 2013
2008 Plan [Member]
Class A Common Stock [Member]
Dec. 31, 2012
2008 Plan [Member]
Class A Common Stock [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of equity participation plans 2                            
Contractual life of options and restricted stock units                           7 years 10 years
Maximum issuance of shares             15,000,000 15,000,000       500,000      
Maximum issuance of granted           7,500,000                  
Shares remaining available for future issuance under the plan             12,500,000   354,441            
Weighted-average fair value of options granted $ 17.38 $ 20.31 $ 18.53                        
Total intrinsic value for options exercised $ 39,300,000 $ 49,000,000 $ 12,700,000                        
Cash received from option exercises 21,400,000 32,000,000 15,200,000                        
Tax benefit realized from stock option exercises 0 0 0                        
Share price $ 89.84                            
Total unrecognized compensation cost related to unvested stock options       22,900,000                      
Weighted average period to recognize cost       2 years 7 months 24 days 2 years 4 months 24 days                    
Total fair value of shares vested 9,800,000 9,000,000 9,000,000                        
Total unrecognized compensation expense related to unvested restricted stock         11,900,000                    
Percentage of purchase plan price per share equal to the fair market value                 85.00%            
Class A common stock were issued under the purchase plan                       25,604 23,724    
Cash proceeds from issuance of shares under the purchase plan                       1,700,000 1,100,000    
Non-cash compensation expense 17,205,000 13,968,000 11,469,000           300,000 200,000 200,000        
Non-cash compensation capitalized to fixed and intangible assets $ 200,000 $ 200,000 $ 200,000