Goodwill and other intangible assets

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and other intangible assets

Goodwill and other intangible assets

The carrying amount of goodwill, which is related to the natural gas distribution and construction services segments, remained unchanged at $489.0 million at September 30, 2023 and 2022, and December 31, 2022. No impairments of goodwill have been recorded in these periods.

Other amortizable intangible assets were as follows:

	September 30, 2023		September 30, 2022		December 31, 2022
	(In thousands)
Customer relationships	$	10,450	$	10,450	$	10,450
Less accumulated amortization	7,924		5,834		6,356
	2,526		4,616		4,094
Noncompete agreements	292		552		552
Less accumulated amortization	292		520		544
	—		32		8
Total	$	2,526	$	4,648	$	4,102

Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2023, was $522,000 and $1.6 million, respectively. Amortization expense for amortizable intangible assets for the three and nine months ended September 30, 2022, was $565,000 and $1.7 million, respectively. Amortization expense for identifiable intangible assets as of September 30, 2023 is estimated to be as follows:

	Remainder of 2023		2024		2025		2026		2027		Thereafter
	(In thousands)
Amortization expense	$	522	$	1,888	$	116	$	—	$	—	$	—