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Certain Balance Sheet Components Depreciation Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Depreciation expense [Line Items]
Depreciation expense	$ 15,314	$ 15,934

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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