Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Revenue	$ 174,738	$ 156,078	$ 511,231	$ 478,998
Operating Income	15,326	13,078	42,626	38,396
Goodwill	31,814	32,019	31,814	32,019	31,648
Total Identifiable Assets	449,644	419,222	449,644	419,222	404,339
Industrial
Segment Reporting Information [Line Items]
Net Revenue	71,890	61,972	218,863	196,841
Operating Income	6,489	3,866	20,030	14,954
Goodwill	13,282	13,453	13,282	13,453
Total Identifiable Assets	171,463	155,730	171,463	155,730
Agricultural
Segment Reporting Information [Line Items]
Net Revenue	61,157	54,135	168,048	155,487
Operating Income	6,250	5,787	16,261	14,547
Goodwill	0	0	0	0
Total Identifiable Assets	124,096	118,773	124,096	118,773
European
Segment Reporting Information [Line Items]
Net Revenue	41,691	39,971	124,320	126,670
Operating Income	2,587	3,425	6,335	8,895
Goodwill	18,532	18,566	18,532	18,566
Total Identifiable Assets	$ 154,085	$ 144,719	$ 154,085	$ 144,719