Interim Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net sales:
Net sales	$ 240,455	$ 216,766	$ 669,120	$ 639,226
Cost of sales	175,516	162,055	495,338	482,060
Gross profit	64,939	54,711	173,782	157,166
Selling, general and administrative expenses	37,328	33,699	105,913	101,824
Income from operations	27,611	21,012	67,869	55,342
Interest expense	(1,414)	(1,405)	(4,241)	(4,334)
Interest income	100	43	257	161
Other income (expense), net	(1,411)	127	(2,284)	(253)
Income before income taxes	24,886	19,777	61,601	50,916
Provision for income taxes	8,294	6,541	20,526	18,459
Net Income	$ 16,592	$ 13,236	$ 41,075	$ 32,457
Net income per common share:
Basic (in dollars per share)	$ 1.43	$ 1.15	$ 3.56	$ 2.84
Diluted (in dollars per share)	$ 1.42	$ 1.14	$ 3.52	$ 2.81
Average common shares:
Basic (in shares)	11,586	11,460	11,535	11,424
Diluted (in shares)	11,708	11,595	11,666	11,551
Dividends declared (in dollars per share)	$ 0.1000	$ 0.09000	$ 0.3000	$ 0.27000
Industrial
Net sales:
Net sales	$ 132,388	$ 121,205	$ 375,546	$ 361,629
Income from operations	14,826	9,318	38,238	30,016
Agricultural
Net sales:
Net sales	64,923	56,443	170,921	156,950
Income from operations	8,563	7,928	19,190	16,735
European
Net sales:
Net sales	43,144	39,118	122,653	120,647
Income from operations	$ 4,222	$ 3,766	$ 10,441	$ 8,591