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Share-Based Compensation (Reconciliation Of Stock Option Expense) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-Based Compensation [Abstract]
General and administrative expense	$ 2,450	$ 2,166	$ 7,397	$ 10,028
Lease operating expense	0	239	140	840
Total share-based compensation expense	2,450	2,405	7,537	10,868
Share-based compensation capitalized	1,509	1,362	4,309	3,537
Total share-based compensation	$ 3,959	$ 3,767	$ 11,846	$ 14,405

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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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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