Stock-Based Compensation Plans (Details 2) (USD $)	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Additional disclosures
Restricted stock awards issued	123,977
Estimated aggregate compensation cost related to restricted stock awards	$ 36,996,000
Stock-based compensation expense	11,793,000	6,106,000
Capitalized stock-based compensation cost	3,922,000	2,603,000
Stock Options
Additional disclosures
Unrecognized compensation cost for unvested stock options	4,729,000
Weighted average period for recognition of unrecognized compensation cost	2 years 2 months 26 days
Restricted stock
Weighted average assumptions
Percentage of granted award which will vest	33.00%
Award vesting period	3 years
Additional disclosures
Outstanding unvested shares granted	192,212
Shares vested	132,790
Total fair value of shares vested	13,685,000	36,162,000
Unrecognized compensation cost for unvested restricted stock	$ 11,664,000
Weighted average period for recognition of unrecognized compensation cost	2 years 10 months 6 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

The historical volatility rate used in valuation technique of calculation of fair value of awards.

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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Price of a single share of a number of saleable stocks of a company.

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