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Certain Balance Sheet Components Depreciation Expense (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Depreciation expense [Line Items]
Depreciation expense	$ 16,571	$ 14,994	$ 32,505	$ 30,494

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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