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Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenue, Major Customer [Line Items]        
Sales $ 26,001 $ 17,121 $ 47,358 $ 35,884
Customer A [Member]        
Revenue, Major Customer [Line Items]        
Sales     9,667 6,770
Customer B [Member]        
Revenue, Major Customer [Line Items]        
Sales     $ 6,382