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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Commitments and contingencies (Textual) [Abstract]
Company leases office facilities expiration date	Dec. 31, 2028
Accrued liability relating to certain sales	$ 3.3	$ 3.0

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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