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Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Intangible assets included operating costs and expenses
Amortization of purchased intangible assets	$ 224	$ 1,398
Cost of net revenues [Member]
Intangible assets included operating costs and expenses
Amortization of purchased intangible assets	84	961
General and administrative expenses [Member]
Intangible assets included operating costs and expenses
Amortization of purchased intangible assets	$ 140	$ 437

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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