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Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
Commitments and Contingencies (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012
Commitments and Contingencies (Textual) [Abstract]
Rent payment under operating lease	$ 1,600,000	$ 1,600,000	$ 1,600,000
Unrecognized tax benefits ,penalties and interest expense	456,000	439,000
Liability associated with potential pre-acquisition sales	$ 1,500,000			$ 550,000

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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