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Intangible Assets, Net (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Schedule of activity in intangible assets
Balance, beginning of period	$ 52,096	$ 52,977
Purchases		141
Amortization	(1,985)	(2,040)
Balance, end of period	$ 50,187	$ 51,078

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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