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Goodwill and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2020

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


	Balance at January 1, 2020		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at September 30, 2020
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	217,234		6,483		—		223,717
Construction services	118,388		24,436		400		143,224
Total	$	681,358	$	30,919	$	400	$	712,677


	Balance at January 1, 2019		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at September 30, 2019
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	209,421		14,473		(6,669)		217,225
Construction services	109,765		8,623		—		118,388
Total	$	664,922	$	23,096	$	(6,669)	$	681,349


	Balance at January 1, 2019		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at December 31, 2019
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	209,421		14,482		(6,669)		217,234
Construction services	109,765		8,623		—		118,388
Total	$	664,922	$	23,105	$	(6,669)	$	681,358

Other amortizable intangible assets were as follows:


	September 30, 2020		September 30, 2019		December 31, 2019
	(In thousands)
Customer relationships	$	27,551	$	18,011	$	17,958
Less accumulated amortization	5,958		5,823		6,268
	21,593		12,188		11,690
Noncompete agreements	3,941		3,419		3,439
Less accumulated amortization	2,176		1,868		1,957
	1,765		1,551		1,482
Other	12,853		7,488		8,094
Less accumulated amortization	9,835		5,716		6,020
	3,018		1,772		2,074
Total	$	26,376	$	15,511	$	15,246

Estimated amortization expense for identifiable intangible assets as of September 30, 2020, was: