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Revenue and Segment Reporting (Schedule of Segment Reporting) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Revenue	$ 288,624	$ 291,759	$ 268,635	$ 314,448	$ 300,189	$ 271,829	$ 285,186	$ 261,934	$ 1,163,466	$ 1,119,138	$ 1,008,822
Income from Operations									93,165	94,648	101,088
Goodwill	195,132				198,022				195,132	198,022	83,243	$ 84,761
Identifiable Assets	1,109,329				1,212,763				1,109,329	1,212,763
Industrial
Segment Reporting Information [Line Items]
Net Revenue									811,161	768,454	638,198
Income from Operations									59,881	65,262	65,077
Goodwill	181,338				183,307				181,338	183,307	68,672	69,504
Identifiable Assets	868,688				922,738				868,688	922,738
Agricultural
Segment Reporting Information [Line Items]
Net Revenue									352,305	350,684	370,624
Income from Operations									33,284	29,386	36,011
Goodwill	13,794				14,715				13,794	14,715	14,571	$ 15,257
Identifiable Assets	$ 240,641				$ 290,025				240,641	290,025
Wholegoods
Segment Reporting Information [Line Items]
Net Revenue									885,254	875,805	802,403
Parts
Segment Reporting Information [Line Items]
Net Revenue									247,126	207,766	186,979
Other
Segment Reporting Information [Line Items]
Net Revenue									$ 31,086	$ 35,567	$ 19,440

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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