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Share-Based Compensation (Summary Of Share Based Compensation Expense) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-based compensation incurred	$ 1,859	$ 1,488	$ 4,048	$ 3,314
Capitalized share-based compensation	(176)	(191)	(358)	(384)
Share-based compensation expense	1,683	1,297	3,690	2,930
Grants Of Options [Member]
Share-based compensation incurred	208	290	462	562
Grants Of Common Shares [Member]
Share-based compensation incurred	$ 1,651	$ 1,198	$ 3,586	$ 2,752

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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