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Goodwill and Intangibles
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangibles GOODWILL AND INTANGIBLES
Goodwill
The change in carrying amount of goodwill by reporting segment was as follows (in thousands):
InstallationOtherConsolidated
Goodwill (gross) - January 1, 2023$355,226 $88,333 $443,559 
Business combinations15,860 — 15,860 
Other525 5,273 5,798 
Goodwill (gross) - September 30, 2023371,611 93,606 465,217 
Accumulated impairment losses (70,004)— (70,004)
Goodwill (net) - September 30, 2023$301,607 $93,606 $395,213 
Other changes presented in the above table primarily include one immaterial acquisition and adjustments for the allocation of certain acquisitions still under measurement made during the nine months ended September 30, 2023, including measurement period adjustments primarily associated with a tax election that resulted in a $4.4 million change in purchase price for a 2022 acquisition. For additional information regarding changes to goodwill resulting from acquisitions, see Note 17, Business Combinations.
We test goodwill for impairment annually during the fourth quarter of our fiscal year or earlier if there is an impairment indicator. Accumulated impairment losses included within the above table were incurred over multiple periods and were all associated with the Installation segment, with the latest impairment charge being recorded during the year ended December 31, 2010.
Intangibles, net
The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):
 As of September 30,As of December 31,
 20232022
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Book
Value		Gross
Carrying
Amount		Accumulated
Amortization		Net
Book
Value
Amortized intangibles:      
Customer relationships$351,806 $170,134 $181,672 $338,050 $145,722 $192,328 
Covenants not-to-compete31,439 22,852 8,587 30,899 20,086 10,813 
Trademarks and tradenames126,054 45,411 80,643 119,612 39,638 79,974 
Backlog21,635 21,228 407 20,815 20,457 358 
 $530,934 $259,625 $271,309 $509,376 $225,903 $283,473 
The gross carrying amount of intangibles increased approximately $21.6 million during the nine months ended September 30, 2023 primarily due to business combinations. For more information, see Note 17, Business Combinations.
Remaining estimated aggregate annual amortization expense is as follows (amounts, in thousands, are for the fiscal year ended):
Remainder of 2023$10,717 
202440,186 
202534,645 
202630,693 
202726,408 
Thereafter128,660