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Goodwill and other intangible assets (Tables)

3 Months Ended

Mar. 31, 2021

The changes in the carrying amount of goodwill were as follows:


	Balance at January 1, 2021		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at March 31, 2021
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	226,003		—		—		226,003
Construction services	143,224		—		—		143,224
Total	$	714,963	$	—	$	—	$	714,963


	Balance at January 1, 2020		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at March 31, 2020
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	217,234		6,483		—		223,717
Construction services	118,388		25,686		—		144,074
Total	$	681,358	$	32,169	$	—	$	713,527


	Balance at January 1, 2020		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at December 31, 2020
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	217,234		8,778		(9)		226,003
Construction services	118,388		24,436		400		143,224
Total	$	681,358	$	33,214	$	391	$	714,963

Other amortizable intangible assets were as follows:


	March 31, 2021		March 31, 2020		December 31, 2020
	(In thousands)
Customer relationships	$	28,836	$	30,087	$	28,836
Less accumulated amortization	7,792		4,138		6,887
	21,044		25,949		21,949
Noncompete agreements	3,941		4,229		3,941
Less accumulated amortization	2,441		1,928		2,309
	1,500		2,301		1,632
Other	11,957		13,060		12,927
Less accumulated amortization	10,540		7,060		11,012
	1,417		6,000		1,915
Total	$	23,961	$	34,250	$	25,496

Estimated amortization expense for identifiable intangible assets as of March 31, 2021, was: