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Goodwill and other intangible assets
 6 Months Ended
Jun. 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 June 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:
 June 30, 2023June 30, 2022December 31, 2022
 (In thousands)
Customer relationships$10,450 $10,450 $10,450 
Less accumulated amortization7,401 5,312 6,356 
 3,049 5,138 4,094 
Noncompete agreements292 552 552 
Less accumulated amortization292 477 544 
— 75 8 
Total$3,049 $5,213 $4,102 
Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2023, was $522,000 and $1.1 million, respectively. Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2022, was $568,000 and $1.1 million, respectively. Amortization expense for identifiable intangible assets as of June 30, 2023 is estimated to be as follows:
Remainder of 20232024202520262027Thereafter
(In thousands)
Amortization expense$1,045 $1,888 $116 $— $— $—