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Goodwill & Other Intangible Assets (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 10 months 24 days
Amortization of Intangible Assets	$ 4,598,000	$ 3,418,000	$ 2,256,000

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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