Interim Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net sales:
Net sales	$ 178,064	$ 167,009	$ 336,493	$ 322,920
Cost of sales	133,973	127,848	257,490	248,521
Gross profit	44,091	39,161	79,003	74,399
Selling, general and administrative expenses	26,530	24,836	51,703	49,081
Income from operations	17,561	14,325	27,300	25,318
Interest expense	(336)	(525)	(578)	(968)
Interest income	41	58	85	113
Other income (expense), net	343	152	632	(422)
Income before income taxes	17,609	14,010	27,439	24,041
Provision for income taxes	5,822	4,666	8,702	7,912
Net Income	11,787	9,344	18,737	16,129
Net income per common share:
Basic (in dollars per share)	$ 0.98	$ 0.79	$ 1.56	$ 1.36
Diluted (in dollars per share)	$ 0.97	$ 0.77	$ 1.54	$ 1.34
Average common shares:
Basic (in shares)	12,044	11,884	12,025	11,879
Diluted (in shares)	12,200	12,058	12,179	12,042
Dividends declared (in dollars per share)	$ 0.07	$ 0.06	$ 0.14	$ 0.12
North American Industrial
Net sales:
Net sales	77,639	70,137	146,973	134,869
Income from operations	8,344	6,247	13,541	11,086
North American Agricultural
Net sales:
Net sales	57,255	53,081	106,891	101,352
Income from operations	7,375	5,459	10,011	8,762
European
Net sales:
Net sales	43,170	43,791	82,629	86,699
Income from operations	$ 1,842	$ 2,619	$ 3,748	$ 5,470