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Stock-Based Compensation (Employee Stock-Based Compensation Costs) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-Based Compensation [Abstract]
Stock-based compensation costs - expensed	$ 2,677,000	$ 1,933,000	$ 8,226,000	$ 6,619,000
Stock-based compensation costs - capitalized	2,482,000	2,188,000	7,788,000	6,003,000
Unrecognized compensation cost related to unvested stock option and restricted stock grants	$ 35,700,000		$ 35,700,000
Weighted average period over which cost is recognized, years			2 years 4 months 25 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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