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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue from external customers        
Net sales $ 91,970 $ 84,399 $ 184,662 $ 156,129
Canadian operations        
Revenue from external customers        
Net sales $ 5,400 $ 5,900 $ 11,000 $ 11,500