Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Reportable_Segment	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of principal reporting segments	3
Net Revenue	$ 676,836	$ 628,402	$ 603,593
Income from Operations	50,737	45,349	49,456
Goodwill, balance at the end of the period	32,073	31,648	31,751	34,073
Total Identifiable Assets	438,476	404,339	381,665
North American Industrial
Segment Reporting Information [Line Items]
Net Revenue	296,617	263,353	229,594
Income from Operations	25,743	19,313	24,649
Goodwill, balance at the end of the period	13,176	13,418	13,316
Total Identifiable Assets	161,080	153,234	144,763
North American Agricultural
Segment Reporting Information [Line Items]
Net Revenue	215,340	200,467	203,993
Income from Operations	17,880	18,319	16,644
Goodwill, balance at the end of the period	0	0	0
Total Identifiable Assets	123,352	118,829	121,320
European
Segment Reporting Information [Line Items]
Net Revenue	164,879	164,582	170,006
Income from Operations	7,114	7,717	8,163
Goodwill, balance at the end of the period	18,897	18,230	18,435
Total Identifiable Assets	$ 154,044	$ 132,276	$ 115,582