Quarterly report pursuant to Section 13 or 15(d)

Foreign Currency Translation (Details)

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Foreign Currency Translation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue from external customers        
Net sales $ 97,653 $ 90,505 $ 282,314 $ 246,635
Canadian operations        
Revenue from external customers        
Net sales $ 5,500 $ 5,700 $ 16,500 $ 17,300