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Share-Based Compensation (Share-Based Compensation Expense for Option Grants, Restricted Stock Awards and Restricted Stock Unit Awards) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-based compensation expense	$ 1,511	$ 1,064	$ 3,698	$ 2,891
Number of shares issued to non-employee directors	2,050	1,956	3,985	4,080
Restricted Stock Unit Awards [Member]
Share-based compensation expense	148	(41)	330	112
Stock Options and Restricted Stock Awards [Member]
Share-based compensation expense	$ 1,363	$ 1,105	$ 3,368	$ 2,779

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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