Revenue and Segment Information - Revenue, Income, Goodwill and Identifiable Assets by Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net Sales	$ 268,635	$ 285,186	$ 583,083	$ 547,120
Income from Operations	22,661	29,349	46,517	51,955
Goodwill	195,457		195,457		$ 198,022
Total Identifiable Assets	1,189,688		1,189,688		1,212,763
Industrial
Segment Reporting Information [Line Items]
Net Sales	182,257	194,304	412,232	367,834
Income from Operations	13,898	21,538	32,215	38,485
Goodwill	182,672		182,672		183,307
Total Identifiable Assets	913,295		913,295		922,738
Agricultural
Segment Reporting Information [Line Items]
Net Sales	86,378	90,882	170,851	179,286
Income from Operations	8,763	$ 7,811	14,302	$ 13,470
Goodwill	12,785		12,785		14,715
Total Identifiable Assets	$ 276,393		$ 276,393		$ 290,025