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Stock-Based Compensation Arrangements (Non-cash stock-based compensation recorded in general and administrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
G & A Expenses	$ 4,641,000	$ 2,988,000	$ 3,191,000
Capitalized G & A	1,634,000	1,051,000	988,000
Total non-cash stock-based compensation	6,275,000	4,039,000	4,179,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,700,000

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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