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Goodwill and Intangible Assets (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in the carrying amount of intangible assets
Beginning balance	$ 40,307	$ 40,543
Amortization	(235)	(236)	(236)
Ending balance	$ 40,072	$ 40,307	$ 40,543

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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