Exit Activity Costs and Asset Impairments (Schedule Of Asset Impairment Charges Related To Restructuring Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Exit activity costs	$ 7,020	$ 2,207	$ 5,166
Asset impairment charges	1,193	81	408
Restructuring charges	8,213	2,288	5,574
Corporate
Restructuring Cost and Reserve [Line Items]
Exit activity costs	145	375	1,660
Asset impairment charges	0	0	0
Restructuring charges	145	375	1,660
Renewables | Operating Segments
Restructuring Cost and Reserve [Line Items]
Exit activity costs	4,769	15	66
Asset impairment charges	1,193	0	0
Restructuring charges	5,962	15	66
Residential | Operating Segments
Restructuring Cost and Reserve [Line Items]
Exit activity costs	393	731	3,440
Asset impairment charges	0	9	417
Restructuring charges	393	740	3,857
Infrastructure | Operating Segments
Restructuring Cost and Reserve [Line Items]
Exit activity costs	26	226	0
Asset impairment charges	0	0	0
Restructuring charges	26	226	0
Agtech | Operating Segments
Restructuring Cost and Reserve [Line Items]
Exit activity costs	1,687	860	0
Asset impairment charges	0	72	(9)
Restructuring charges	$ 1,687	$ 932	$ (9)