Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net sales:
Net sales	$ 603,593	$ 538,548	$ 454,825
Cost of sales	468,508	421,634	360,264
Gross profit	135,085	116,914	94,561
Selling, general and administrative expense	92,347	86,041	76,100
Gain on bargain purchase	(7,745)	0	(30,177)
Goodwill impairment	1,898	0	14,104
Income from operations	48,585	30,873	34,534
Interest expense	(2,422)	(3,664)	(4,766)
Interest income	246	1,533	713
Other income (expense), net	848	290	625
Income before income taxes	47,257	29,032	31,106
Provision for income taxes	15,187	7,915	12,473
Net Income	32,070	21,117	18,633
Net income per common share:
Basic (in dollars per share)	$ 2.71	$ 1.79	$ 1.80
Diluted (in dollars per share)	$ 2.68	$ 1.78	$ 1.80
Average common shares:
Basic (in shares)	11,848	11,782	10,330
Diluted (in shares)	11,966	11,893	10,363
North American Industrial
Net sales:
Net sales	229,594	196,783	177,593
North American Agricultural
Net sales:
Net sales	203,993	181,349	95,188
European
Net sales:
Net sales	$ 170,006	$ 160,416	$ 182,044