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Commitments and Contingencies (Details Textual) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 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 14,272    
Product Warranty Accrual, Noncurrent $ 161 $ 175