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Goodwill and Other Intangible Assets (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Other Intangible Assets (Textual) [Abstract]
Accumulated goodwill impairment losses	$ 0
Amortization of intangible assets	$ 2,445	$ 2,562	$ 3,620

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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