Annual report pursuant to Section 13 and 15(d)

Industry, Segment and Geographic Information - Sales and Assets (Details)

v3.6.0.2
Industry, Segment and Geographic Information - Sales and Assets (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
country
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
country
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
country
Dec. 31, 2015
USD ($)
country
Dec. 31, 2014
USD ($)
country
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Number of countries other than USA that make up 10% or more of net sales | country 0       0       0 0 0
Net sales to Unaffiliated Customers $ 119,965 $ 99,586 $ 105,257 $ 93,323 $ 99,776 $ 97,653 $ 91,970 $ 92,691 $ 418,131 $ 382,090 $ 340,758
Identifiable Assets by Geographic Areas 113,698       94,082       113,698 94,082 94,981
USA                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Net sales to Unaffiliated Customers                 364,989 336,110 294,274
Identifiable Assets by Geographic Areas 106,014       87,679       106,014 87,679 87,324
Canada                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Net sales to Unaffiliated Customers                 28,491 23,957 23,757
Identifiable Assets by Geographic Areas $ 7,684       $ 6,403       7,684 6,403 7,657
Rest of the world                      
Net sales to unaffiliated customers and identifiable assets by geographic areas                      
Net sales to Unaffiliated Customers                 $ 24,651 $ 22,023 $ 22,727