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Stock-Based Compensation (Employee Stock-Based Compensation Costs) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-Based Compensation [Abstract]
Stock-based compensation costs - expensed	$ 2,705,000	$ 2,236,000	$ 5,549,000	$ 4,686,000
Stock-based compensation costs - capitalized	2,442,000	1,905,000	5,306,000	3,815,000
Unrecognized compensation cost related to unvested stock option and restricted stock grants	$ 41,300,000		$ 41,300,000
Weighted average period over which cost is recognized, years			2 years 6 months 0 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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