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Goodwill and Other Intangible Assets (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Goodwill and Other Intangible Assets (Textual) [Abstract]
Amortization expense on other intangible assets	$ 2,409,000	$ 1,801,000	$ 7,733,000	$ 5,295,000
Goodwill impairment charges			$ 0

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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