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Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share Based Payment Arrangements Expense [Abstract]
Expensed	$ 2,359	$ 4,395	$ 5,705
Amounts capitalized	(191)	(282)	(451)
Total share based payment	$ 2,168	$ 4,113	$ 5,254

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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