Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill
Goodwill, Beginning Balance	$ 871,808
Adjustments to identifiable assets acquired and liabilities assumed	(14,158)
Goodwill, Ending Balance	857,650
Utilities
Goodwill
Goodwill, Beginning Balance	716,284
Adjustments to identifiable assets acquired and liabilities assumed	(12,822)
Goodwill, Ending Balance	703,462
Energy
Goodwill
Goodwill, Beginning Balance	155,524
Adjustments to identifiable assets acquired and liabilities assumed	(1,336)
Goodwill, Ending Balance	$ 154,188