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Goodwill and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2021

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, 2021			Goodwill Acquired During  the Year			Measurement Period Adjustments			Balance at September 30, 2021
			(In thousands)
Natural gas distribution			$	345,736		$	—		$	—		$	345,736
Construction materials and contracting			226,003			2,900			(217)			228,686
Construction services			143,224			—			—			143,224
Total			$	714,963		$	2,900		$	(217)		$	717,646

			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, 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

Other amortizable intangible assets were as follows:

			September 30, 2021			September 30, 2020			December 31, 2020
			(In thousands)
Customer relationships			$	29,423		$	27,551		$	28,836
Less accumulated amortization			9,705			5,958			6,887
			19,718			21,593			21,949
Noncompete agreements			3,991			3,941			3,941
Less accumulated amortization			2,710			2,176			2,309
			1,281			1,765			1,632
Other			11,957			12,853			12,927
Less accumulated amortization			10,715			9,835			11,012
			1,242			3,018			1,915
Total			$	22,241		$	26,376		$	25,496

Estimated amortization expense

Estimated amortization expense for identifiable intangible assets as of September 30, 2021, was:

			Remainder of 2021			2022			2023			2024			2025			Thereafter
			(In thousands)
Amortization expense			$	1,220		$	4,678		$	4,329		$	3,957		$	2,060		$	5,997

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Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
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-Topic 350
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Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
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Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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