Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue, Net	$ 156,078	$ 155,057	$ 478,998	$ 456,596
Operating Income	13,078	14,461	38,396	37,508
Goodwill	32,019	33,949	32,019	33,949	31,751
Total Identifiable Assets	419,222	402,203	419,222	402,203	381,665
Industrial
Segment Reporting Information [Line Items]
Revenue, Net	61,972	56,965	196,841	165,319
Operating Income	3,866	4,146	14,954	12,248
Goodwill	13,453	13,132	13,453	13,132
Total Identifiable Assets	155,730	127,364	155,730	127,364
Agricultural
Segment Reporting Information [Line Items]
Revenue, Net	54,135	55,301	155,487	160,510
Operating Income	5,787	6,432	14,547	15,203
Goodwill	0	0	0	0
Total Identifiable Assets	118,773	132,784	118,773	132,784
European
Segment Reporting Information [Line Items]
Revenue, Net	39,971	42,791	126,670	130,767
Operating Income	3,425	3,883	8,895	10,057
Goodwill	18,566	20,817	18,566	20,817
Total Identifiable Assets	$ 144,719	$ 142,055	$ 144,719	$ 142,055