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Sales (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue, Major Customer [Line Items]        
Sales $ 17,918 $ 15,715 $ 36,922 $ 30,745
Customer Concentration Risk [Member] | Sales [Member] | Customer "A" [Member]
       
Revenue, Major Customer [Line Items]        
Sales     11,036 9,985
Customer Concentration Risk [Member] | Sales [Member] | Customer "B" [Member]
       
Revenue, Major Customer [Line Items]        
Sales        [1] $ 3,265
[1] Less than 10% of sales.