Revenue and Segment Information - Revenue, Income, Goodwill and Identifiable Assets by Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net Sales	$ 291,759	$ 271,829	$ 874,842	$ 818,949
Income from Operations	30,923	24,455	77,440	76,410
Goodwill	192,976		192,976		$ 198,022
Total Identifiable Assets	1,173,459		1,173,459		1,212,763
Industrial
Segment Reporting Information [Line Items]
Net Sales	196,241	178,180	608,473	546,014
Income from Operations	19,238	14,583	51,453	53,068
Goodwill	179,989		179,989		183,307
Total Identifiable Assets	909,188		909,188		922,738
Agricultural
Segment Reporting Information [Line Items]
Net Sales	95,518	93,649	266,369	272,935
Income from Operations	11,685	$ 9,872	25,987	$ 23,342
Goodwill	12,987		12,987		14,715
Total Identifiable Assets	$ 264,271		$ 264,271		$ 290,025