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Stock-Based Compensation (Stock-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
Stock-based compensation expense	$ 1,427	$ 1,989	$ 2,546	$ 5,483
Stock Options [Member]
Stock-based compensation expense	0	120	265	225
Time-based Restricted Stock [Member]
Stock-based compensation expense	925	1,210	1,559	4,343
Performance Shares And Units [Member]
Stock-based compensation expense	$ 502	$ 659	$ 722	$ 915

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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