Geographic Information (Tables)

12 Months Ended

Dec. 31, 2016

Segments Geographical Areas [Abstract]

Geographical Information Attributable to Net Sales

	Years ended December 31,
	2014		2015		2016
	(In thousands)
Net sales - point of destination:
United States	$	98,994	$	103,737	$	98,526
Canada		1,927		2,352		7,515
Other		2,925		2,905		2,879
Total	$	103,846	$	108,994	$	108,920