Industry Segments - Additional Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment									2
Net sales	$ 139,194	$ 141,661	$ 164,335	$ 156,348	$ 158,271	$ 162,109	$ 152,784	$ 150,485	$ 601,538	$ 623,649	$ 584,733
Foreign Countries [Member]
Segment Reporting Information [Line Items]
Net sales									105,600	110,400	$ 95,100
Long-lived assets	$ 33,200				$ 44,800				$ 33,200	$ 44,800
Sales [Member] | Customer Concentration Risk [Member] | Brazil [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									4.70%	7.30%	8.20%
Sales [Member] | Customer Concentration Risk [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									5.20%	4.20%	3.30%