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Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue, Major Customer [Line Items]        
Sales $ 17,121 $ 17,918 $ 35,884 $ 36,922
Customer "A" [Member]        
Revenue, Major Customer [Line Items]        
Sales     $ 6,770 $ 11,036