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Stock-Based Compensation (Employee Stock-Based Compensation Costs) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-Based Compensation [Abstract]
Stock-based compensation costs - expensed	$ 2,994,000	$ 2,844,000
Stock-based compensation costs - capitalized	2,862,000	2,864,000
Unrecognized compensation cost related to unvested stock option and restricted stock grants	$ 49,900,000
Weighted average period over which cost is recognized, years	2 years 7 months 6 days

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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