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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

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

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