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Commitments and Contingencies (Details Textual) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Letter Of Credit [Member]
Site Contingency, Accrual, Undiscounted Amount $ 1,921 $ 1,921  
Environmental Exit Costs, Anticipated Cost     2,000
Loss Contingency, Estimate of Possible Loss 13,915    
Product Warranty Accrual, Noncurrent $ 169 $ 175