Intangible Assets

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

7. Intangible Assets

The following table presents intangible assets as of:

	March 31, 2021					December 31, 2020
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
	(In thousands)
Customer relationships	$	1,532,135	$	(155,107	)	$	195,435	$	(94,690	)
Trade names		185,361		(65,766	)		52,061		(38,138	)
Subcontractor relationships		5,440		(2,397	)		5,440		(1,944	)
Non-compete agreements		3,719		(2,135	)		3,719		(2,001	)
Total intangible assets	$	1,726,655	$	(225,405	)	$	256,655	$	(136,773	)

In connection with the BMC Merger, we recorded intangible assets of $1,470.0 million, which includes $1,336.7 million of customer relationships and $133.3 million of trade names. The weighted average useful lives of the acquired intangible assets are 11.3 years in total, 11.4 years for customer relationships and 5.5 years for trade names, respectively.

During the three months ended March 31, 2021 and 2020, we recorded amortization expense in relation to the above-listed intangible assets of $88.6 million and $5.7 million, respectively.

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

2021 (from April 1, 2021)	$	257,017
2022		207,258
2023		180,421
2024		159,158
2025		140,181
Thereafter		557,215
Total future net intangible amortization expense	$	1,501,250