Acquisition (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	May 30, 2012 Contingency	May 12, 2011
Acquisition (Additional Textual) [Abstract]
Entity acquisition liability incurred	$ 2.3
Acquisition (Textual) [Abstract]
Purchase Price	9.0
Cash paid on acquisition	1.4		6.7
Number of contingency provisions elapsed		2
Payment for employee retention and Lease extension	0.9
Goodwill deductible for tax purpose	2.1
Business acquisition effective date	May 12, 2011
Accrued Liabilities [Member]
Acquisition (Additional Textual) [Abstract]
Entity acquisition liability incurred	$ 0.9