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Property and Equipment (Depreciation and Amortization Expense) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Property and Equipment
Depreciation expense	$ 2,246	$ 1,979	$ 4,162	$ 3,915

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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