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Contingencies and Commitments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]      
Rental expenses $ 2,872 $ 2,823 $ 2,838
Purchase Commitment, Remaining Minimum Amount Committed $ 147,139 $ 50,256