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Goodwill and other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill
The changes in the carrying amount of goodwill were as follows:
 Balance at January 1, 2022Goodwill
Acquired
During
 the Year		Measurement Period
Adjustments		Balance at December 31, 2022
 (In thousands)
Natural gas distribution$345,736 $— $— $345,736 
Construction materials and contracting276,426 238 (2,124)274,540 
Construction services143,224 — — 143,224 
Total$765,386 $238 $(2,124)$763,500 
Balance at January 1, 2021Goodwill Acquired
During the Year		Measurement Period
Adjustments		Balance at December 31, 2021
(In thousands)
Natural gas distribution$345,736 $— $— $345,736 
Construction materials and contracting226,003 50,640 (217)276,426 
Construction services143,224 — — 143,224 
Total$714,963 $50,640 $(217)$765,386 
Other amortizable intangible assets
Other amortizable intangible assets at December 31 were as follows:
 20222021
 (In thousands)
Customer relationships$28,990 $29,740 
Less accumulated amortization13,724 10,650 
 15,266 19,090 
Noncompete agreements4,591 4,591 
Less accumulated amortization3,529 2,856 
 1,062 1,735 
Other5,280 12,601 
Less accumulated amortization4,076 10,848 
 1,204 1,753 
Total$17,532 $22,578 
Estimated amortization expense The amounts of estimated amortization expense for identifiable intangible assets as of December 31, 2022, were:
20232024202520262027Thereafter
(In thousands)
Amortization expense$4,591 $4,249 $2,200 $1,782 $1,759 $2,951