Intangible Assets

9 Months Ended

Sep. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

7. Intangible Assets

The following table presents intangible assets as of:

	September 30, 2020					December 31, 2019
	Gross carrying amount		Accumulated amortization			Gross carrying amount		Accumulated amortization
	(In thousands)
Customer relationships	$	191,305	$	(90,384	)	$	183,445	$	(77,016	)
Trade names		52,061		(37,638	)		51,361		(36,082	)
Subcontractor relationships		5,440		(1,490	)		4,700		(131	)
Non-compete agreements		3,719		(1,868	)		3,579		(1,468	)
Total intangible assets	$	252,525	$	(131,380	)	$	243,085	$	(114,697	)

In connection with the acquisition of Bianchi, we recorded intangible assets of $9.4 million, which includes $7.9 million of customer relationships, $0.7 million of subcontractor relationships, $0.7 million of trade names and $0.1 million of non-compete agreements. The weighted average useful lives of the acquired assets are 8.2 years in total, 9.3 years for customer relationships, 3.0 years for subcontractor relationships, 3.0 years for trade names and 3.0 years for non-compete agreements.

During the three and nine months ended September 30, 2020, we recorded amortization expense in relation to the above-listed intangible assets of $5.4 million and $16.7 million, respectively. During the three and nine months ended September 30, 2019, we recorded amortization expense in relation to the above-listed intangible assets of $4.1 million and $11.8 million, respectively.

The following table presents the estimated amortization expense for these intangible assets for the years ending December 31 (in thousands):

2020 (from October 1, 2020)	$	5,241
2021		20,231
2022		18,671
2023		15,408
2024		14,094
Thereafter		47,500
Total future net intangible amortization expense	$	121,145