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Commitments and Contingencies (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]    
Operating leases maximum expiration period 10 years  
Rent expense $ 2,458,000 $ 2,332,000
Outstanding purchase commitments $ 7,081,000