Stock-Based Compensation Plans (Details 2) (USD $)	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012
Additional disclosures
Restricted stock awards issued	123,977
Estimated aggregate compensation cost related to restricted stock awards	$ 21,011,000
Stock-based compensation expense	16,768,000	8,394,000
Capitalized stock-based compensation cost	5,911,000	3,877,000
Stock Options
Additional disclosures
Unrecognized compensation cost for unvested stock options	3,421,000
Weighted average period for recognition of unrecognized compensation cost	2 years
Restricted stock
Weighted average assumptions
Percentage of granted award which will vest	33.00%
Award vesting period	3 years
Additional disclosures
Fair value of shares issued	16,019,000
Outstanding unvested shares granted	190,144
Shares vested	134,209
Total fair value of shares vested	13,857,000	36,232,000
Unrecognized compensation cost for unvested restricted stock	$ 9,451,000
Weighted average period for recognition of unrecognized compensation cost	2 years 7 months 13 days
Restricted stock \| Minimum
Additional disclosures
Grant date fair value per share (in dollars per share)	$ 48.60
Restricted stock \| Maximum
Additional disclosures
Grant date fair value per share (in dollars per share)	$ 149.05
Restricted stock units
Weighted average assumptions
Dividend yield (as a percent)	2.80%
Percentage of granted award which will vest	33.00%
Award vesting period	3 years
Measurement period for total shareholder return of the Company's common stock	3 years
Additional disclosures
Number of transitional awards maturing at the end of 2013 and 2014	2
Baseline share value (in dollars per share)	$ 130.23
Historical volatility (as a percent)	50.00%
Implied volatility (as a percent)	50.00%
Risk-free interest rate, minimum (as a percent)	0.08%
Risk-free interest rate, maximum (as a percent)	0.37%
Average estimated fair value (in dollars per share)	$ 110.00
Restricted stock units \| Maximum
Weighted average assumptions
Percentage of stock based compensation elected to be received in the form of stock options upon the election of the recipient	25.00%
2009 Plan \| Stock Options
Additional disclosures
Weighted average fair value per share (in dollars per share)	$ 26.78
Weighted average assumptions
Dividend yield (as a percent)	3.70%
Volatility (as a percent)	34.00%
Risk-free interest rate (as a percent)	0.90%
Expected life of option	5 years

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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