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Stock-Based Compensation Plans (Details 2) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Additional disclosures    
Stock-based compensation expense $ 3,154,000 $ 5,617,000
Capitalized stock-based compensation cost 1,435,000 1,860,000
Stock Options
   
Additional disclosures    
Unrecognized compensation cost for unvested stock options 2,242,000  
Weighted average period for recognition of unrecognized compensation cost 1 year 7 months 24 days  
Restricted stock
   
Additional disclosures    
Restricted stock awards issued 104,060  
Fair value of shares issued 13,331,000  
Outstanding unvested shares granted 211,967  
Shares vested 74,091  
Total fair value of shares vested 8,763,000 8,981,000
Restricted stock | Minimum
   
Additional disclosures    
Grant date fair value per share (in dollars per share) $ 74.20  
Restricted stock | Maximum
   
Additional disclosures    
Grant date fair value per share (in dollars per share) $ 149.05  
Restricted stock units
   
Additional disclosures    
Restricted stock granted (in shares) 131,941  
Estimated aggregate compensation cost related to restricted stock awards 15,627,000  
Restricted stock earned based on total shareholder return metrics related to common stock (in units) 57,493  
Baseline share value (in dollars per share) $ 128.97  
Dividend yield (as a percent) 3.50%  
Estimated volatility, Minimum (as a percent) 17.60%  
Estimated volatility, Maximum (as a percent) 18.60%  
Historical volatility (as a percent) 50.00%  
Implied volatility (as a percent) 50.00%  
Risk-free interest rate, minimum (as a percent) 0.04%  
Risk-free interest rate, maximum (as a percent) 0.72%  
Average estimated fair value (in dollars per share) $ 104.80  
Restricted stock and restricted stock units
   
Additional disclosures    
Unrecognized compensation cost for unvested restricted stock $ 32,631,000  
Weighted average period for recognition of unrecognized compensation cost 4 years 1 month 28 days