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Goodwill and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2019

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



Nine Months Ended September 30, 2019	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



Nine Months Ended September 30, 2018	Balance at January 1, 2018		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at September 30, 2018
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	176,290		8,412		—		184,702
Construction services	109,765		—		—		109,765
Total	$	631,791	$	8,412	$	—	$	640,203



Year Ended December 31, 2018	Balance at January 1, 2018		Goodwill Acquired During the Year		Measurement Period Adjustments		Balance at December 31, 2018
	(In thousands)
Natural gas distribution	$	345,736	$	—	$	—	$	345,736
Construction materials and contracting	176,290		33,131		—		209,421
Construction services	109,765		—		—		109,765
Total	$	631,791	$	33,131	$	—	$	664,922

Other amortizable intangible assets were as follows:



	September 30, 2019		September 30, 2018		December 31, 2018
	(In thousands)
Customer relationships	$	18,011	$	15,920	$	22,720
Less accumulated amortization	5,823		13,342		13,535
	12,188		2,578		9,185
Noncompete agreements	3,419		2,606		2,605
Less accumulated amortization	1,868		1,911		1,956
	1,551		695		649
Other	7,488		6,458		6,458
Less accumulated amortization	5,716		5,413		5,477
	1,772		1,045		981
Total	$	15,511	$	4,318	$	10,815

Estimated amortization expense for identifiable intangible assets as of September 30, 2019, was: