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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Cost of sales, related party transactions $ 6,698 $ 12,187 $ 12,939 $ 23,364