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Revenue and Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 256,038	$ 257,572	$ 257,125	$ 238,087	$ 243,260	$ 240,455	$ 213,276	$ 215,389	$ 1,008,822	$ 912,380	$ 844,748
Income from Operations									101,088	88,738	67,620
Goodwill	83,243				84,761				83,243	84,761	74,825	$ 75,509
Total Identifiable Assets	721,633				639,671				721,633	639,671
Industrial
Segment Reporting Information [Line Items]
Net sales									598,930	522,706	484,088
Income from Operations									64,213	51,914	35,984
Goodwill	61,107				61,682				61,107	61,682	56,447	56,293
Total Identifiable Assets	421,539				369,271				421,539	369,271
Agricultural
Segment Reporting Information [Line Items]
Net sales									235,069	227,389	205,834
Income from Operations									22,649	24,059	20,720
Goodwill	6,230				6,357				6,230	6,357	3,489	2,984
Total Identifiable Assets	162,548				141,023				162,548	141,023
European
Segment Reporting Information [Line Items]
Net sales									174,823	162,285	154,826
Income from Operations									14,226	12,765	10,916
Goodwill	15,906				16,722				15,906	16,722	14,889	$ 16,232
Total Identifiable Assets	$ 137,546				$ 129,377				137,546	129,377
Wholegoods
Segment Reporting Information [Line Items]
Net sales									802,403	714,862	663,331
Parts
Segment Reporting Information [Line Items]
Net sales									186,979	182,412	167,411
Other
Segment Reporting Information [Line Items]
Net sales									$ 19,440	$ 15,106	$ 14,006

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