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Goodwill and other intangible assets (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2022
 (In thousands)
Natural gas distribution$345,736 $— $— $345,736 
Construction materials and contracting276,426 — (2,124)274,302 
Construction services143,224 — — 143,224 
Total$765,386 $— $(2,124)$763,262 
Balance at January 1, 2021Goodwill
Acquired
During
the Year		Measurement
Period
Adjustments		Balance at September 30, 2021
 (In thousands)
Natural gas distribution$345,736 $— $— $345,736 
Construction materials and contracting226,003 2,900 (217)228,686 
Construction services143,224 — — 143,224 
Total$714,963 $2,900 $(217)$717,646 
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 were as follows:
 September 30, 2022September 30, 2021December 31, 2021
 (In thousands)
Customer relationships$28,990 $29,423 $29,740 
Less accumulated amortization12,768 9,705 10,650 
 16,222 19,718 19,090 
Noncompete agreements4,591 3,991 4,591 
Less accumulated amortization3,377 2,710 2,856 
1,214 1,281 1,735 
Other5,279 11,957 12,601 
Less accumulated amortization3,970 10,715 10,848 
 1,309 1,242 1,753 
Total$18,745 $22,241 $22,578 
Estimated amortization expense Estimated amortization expense for identifiable intangible assets as of September 30, 2022, was:
Remainder of 20222023202420252026Thereafter
(In thousands)
Amortization expense$1,159 $4,591 $4,249 $2,200 $1,781 $4,765