NOTE 5 – GOODWILL AND INTANGIBLES

Goodwill

The change in carrying amount of goodwill was as follows (in thousands):


	Goodwill (Gross)		Accumulated Impairment Losses			Goodwill (Net)
January 1, 2018	$	225,470	$	(70,004	)	$	155,466
Business Combinations		11,771		—			11,771
Other		501		—			501

September 30, 2018	$	237,742	$	(70,004	)	$	167,738

Other changes included in the above table represent minor adjustments for the allocation of certain acquisitions still under measurement and one immaterial acquisition completed during the nine months ended September 30, 2018.

We test goodwill for impairment annually during the fourth quarter of our fiscal year or earlier if there is an impairment indicator. No impairment was recognized during either of the nine month periods ended September 30, 2018 or 2017.

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, 2018						As of December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Amortized intangibles:
Customer relationships	$	135,900	$	48,668	$	87,232	$	121,015	$	38,651	$	82,364
Covenants not-to-compete		13,780		6,826		6,954		11,807		4,773		7,034
Trademarks and trade names		62,248		17,166		45,082		58,136		14,076		44,060
Backlog		14,060		13,619		441		13,600		9,067		4,533

	$	225,988	$	86,279	$	139,709	$	204,558	$	66,567	$	137,991

The gross carrying amount of intangibles increased approximately $21.4 million during the nine months ended September 30, 2018 primarily due to business combinations. See Note 14, Business Combinations, for more information. Remaining estimated aggregate annual amortization expense is as follows (amounts, in thousands, are for the fiscal year ended):


Remainder of 2018			5,442
2019			21,332
2020			20,400
2021			19,094
2022			18,176
Thereafter			55,265