Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales	$ 165,944	$ 189,630
Cost of goods sold	129,401	148,914
Gross profit	36,543	40,716
Operating expenses:
Selling, general and administrative	19,308	18,235
Research & development expenses	830	996
Total operating expenses	20,138	19,231
Operating income	16,405	21,485
Interest expense, net	1,353	1,799
Foreign exchange loss	(57)	(39)
Income before income taxes	15,109	19,725
Provision for income taxes	4,186	6,883
Net income	10,923	12,842
Net income attributable to participating common shareholders	$ 10,873	$ 12,793
Income per participating share:
Basic	$ 0.56	$ 0.67
Diluted	$ 0.55	$ 0.66
Weighted average participating shares outstanding:
Basic	19,376,258	19,229,501
Diluted	19,694,751	19,430,029
Other comprehensive income (loss), net of tax:
Change in interest rate swaps, (net of tax of ($56) and $219)	$ 92	$ (358)
Change in pension and post-retirement plans, (net of tax of ($10) and $50)	(5)	(142)
Other comprehensive income (loss), net of tax	87	(500)
Comprehensive income	$ 11,010	$ 12,342