Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales:
Net sales:	$ 676,836	$ 628,402	$ 603,593
Cost of sales	518,326	484,890	468,508
Gross profit	158,510	143,512	135,085
Selling, general and administrative expenses	107,773	97,507	92,347
Gain on bargain purchase	0	0	(8,616)
Goodwill impairment	0	656	1,898
Income from operations	50,737	45,349	49,456
Interest expense	(1,161)	(1,620)	(2,422)
Interest income	186	234	247
Other income (expense), net	1,626	(517)	848
Income before income taxes	51,388	43,446	48,129
Provision for income taxes	15,294	14,543	15,442
Net income	36,094	28,903	32,687
Net income per common share:
Basic (in dollars per share)	$ 3.00	$ 2.43	$ 2.76
Diluted (in dollars per share)	$ 2.96	$ 2.40	$ 2.73
Average common shares:
Basic (in shares)	12,050,000	11,899,000	11,848,000
Diluted (in shares)	12,212,000	12,058,000	11,966,000
North American Industrial
Net sales:
Net sales:	296,617	263,353	229,594
Income from operations	25,743	19,313	24,649
North American Agricultural
Net sales:
Net sales:	215,340	200,467	203,993
Income from operations	17,880	18,319	16,644
European
Net sales:
Net sales:	164,879	164,582	170,006
Income from operations	$ 7,114	$ 7,717	$ 8,163