Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Revenue	$ 178,064	$ 167,009	$ 336,493	$ 322,920
Operating Income	17,561	14,325	27,300	25,318
Goodwill	30,923	31,558	30,923	31,558	31,648
Total Identifiable Assets	425,170	437,347	425,170	437,347	404,339
Industrial
Segment Reporting Information [Line Items]
Net Revenue	77,639	70,137	146,973	134,869
Operating Income	8,344	6,247	13,541	11,086
Goodwill	13,210	13,331	13,210	13,331
Total Identifiable Assets	155,314	159,987	155,314	159,987
Agricultural
Segment Reporting Information [Line Items]
Net Revenue	57,255	53,081	106,891	101,352
Operating Income	7,375	5,459	10,011	8,762
Goodwill	0	0	0	0
Total Identifiable Assets	138,501	136,310	138,501	136,310
European
Segment Reporting Information [Line Items]
Net Revenue	43,170	43,791	82,629	86,699
Operating Income	1,842	2,619	3,748	5,470
Goodwill	17,713	18,227	17,713	18,227
Total Identifiable Assets	$ 131,355	$ 141,050	$ 131,355	$ 141,050