Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Exit activity costs	$ 2,161	$ 624	$ 6,208	$ 917
Asset impairment charges	0	72	1,193	72
Total	2,161	696	7,401	989
Renewables
Restructuring Cost and Reserve [Line Items]
Exit activity costs	786	0	4,564	18
Asset impairment charges	0	0	1,193	0
Total	786	0	5,757	18
Residential
Restructuring Cost and Reserve [Line Items]
Exit activity costs	29	263	94	484
Asset impairment charges	0	0	0	0
Total	29	263	94	484
Agtech
Restructuring Cost and Reserve [Line Items]
Exit activity costs	1,287	316	1,491	316
Asset impairment charges	0	72	0	72
Total	1,287	388	1,491	388
Infrastructure
Restructuring Cost and Reserve [Line Items]
Exit activity costs	0	0	0	0
Asset impairment charges	0	0	0	0
Total	0	0	0	0
Corporate
Restructuring Cost and Reserve [Line Items]
Exit activity costs	59	45	59	99
Asset impairment charges	0	0	0	0
Total	$ 59	$ 45	$ 59	$ 99