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Goodwill and other intangible assets (Tables)
 6 Months Ended
Jun. 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 June 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 June 30, 2021
 (In thousands)
Natural gas distribution$345,736 $— $— $345,736 
Construction materials and contracting226,003 2,900 — 228,903 
Construction services143,224 — — 143,224 
Total$714,963 $2,900 $— $717,863 
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:
 June 30, 2022June 30, 2021December 31, 2021
 (In thousands)
Customer relationships$28,990 $29,423 $29,740 
Less accumulated amortization11,812 8,765 10,650 
 17,178 20,658 19,090 
Noncompete agreements4,591 3,991 4,591 
Less accumulated amortization3,206 2,576 2,856 
1,385 1,415 1,735 
Other5,607 11,957 12,601 
Less accumulated amortization4,130 10,629 10,848 
 1,477 1,328 1,753 
Total$20,040 $23,401 $22,578 
Estimated amortization expense Estimated amortization expense for identifiable intangible assets as of June 30, 2022, was:
Remainder of 20222023202420252026Thereafter
(In thousands)
Amortization expense$2,285 $4,591 $4,305 $2,291 $1,781 $4,787