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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Inventories
Schedule of Contingencies        
Long-term purchase commitment, amount       $ 2,862
Uncertain tax positions $ 1,901 $ 2,384 $ 523