Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net Revenue	$ 628,402	$ 603,593	$ 538,548
Income from Operations	45,349	49,456	30,873
Goodwill, balance at the end of the period	31,648	31,751	34,073	35,207
Total Identifiable Assets	404,339	381,665	370,983
North American Industrial
Segment Reporting Information [Line Items]
Net Revenue	263,353	229,594	196,783
Income from Operations	19,313	24,649	8,513
Goodwill, balance at the end of the period	13,418	13,316	13,316
Total Identifiable Assets	153,234	144,763	120,293
North American Agricultural
Segment Reporting Information [Line Items]
Net Revenue	200,467	203,993	181,349
Income from Operations	18,319	16,644	10,073
Goodwill, balance at the end of the period	0	0	0
Total Identifiable Assets	118,829	121,320	116,575
European
Segment Reporting Information [Line Items]
Net Revenue	164,582	170,006	160,416
Income from Operations	7,717	8,163	12,287
Goodwill, balance at the end of the period	18,230	18,435	20,757
Total Identifiable Assets	$ 132,276	$ 115,582	$ 134,115