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Revenue and Segment Reporting (Schedule of Segment Reporting) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Revenue	$ 300,189	$ 271,829	$ 285,186	$ 261,934	$ 256,038	$ 257,572	$ 257,125	$ 238,087	$ 1,119,138	$ 1,008,822	$ 912,380
Income from Operations									94,648	101,088	88,738
Goodwill	198,022				83,243				198,022	83,243	84,761	$ 74,825
Identifiable Assets	1,212,763				721,633				1,212,763	721,633
Industrial
Segment Reporting Information [Line Items]
Net Revenue									768,454	638,198	563,599
Income from Operations									65,262	65,077	55,752
Goodwill	183,307				68,672				183,307	68,672	69,504	63,152
Identifiable Assets	922,738				440,729				922,738	440,729
Agricultural
Segment Reporting Information [Line Items]
Net Revenue									350,684	370,624	348,781
Income from Operations									29,386	36,011	32,986
Goodwill	14,715				14,571				14,715	14,571	15,257	$ 11,673
Identifiable Assets	$ 290,025				$ 280,904				290,025	280,904
Wholegoods
Segment Reporting Information [Line Items]
Net Revenue									875,805	802,403	714,862
Parts
Segment Reporting Information [Line Items]
Net Revenue									207,766	186,979	182,412
Other
Segment Reporting Information [Line Items]
Net Revenue									$ 35,567	$ 19,440	$ 15,106

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