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Summary of Goodwill and Acquired Intangible Assets (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Change in goodwill carrying value	$ 0

Change in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment, if any, goodwill written off related to the sale of a business or other adjustments to goodwill.

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