Goodwill and Intangible Assets, Net

Goodwill

The following table details the goodwill activity for the years ended December 31, 2018 and 2017:



(in thousands)
December 31, 2016	$	254,832
Acquisition of Code Plus	3,402
Acquisition of TexPly	3,558
December 31, 2017	261,792
Acquisition of Shone Lumber	2,526
Disposition of Coleman Floor	(1,321		)
December 31, 2018	$	262,997

Intangible assets

Intangible assets represent the value assigned to trademarks, customer relationships and non-compete agreements in connection with acquired companies. The following table provides the gross carrying amount and related accumulated amortization of definite-lived intangible assets.



	Trademarks						Customer Relationships					Non-Compete Agreements
	Gross						Gross					Gross
	Carrying			Accumulated			Carrying		Accumulated			Carrying		Accumulated
(in thousands)	Amount			Amortization			Amount		Amortization			Amount		Amortization			Total
December 31, 2015	$	5,350		$	(408	)	$	179,700	$	(2,664	)	$	6,512	$	(554	)	$	187,936
Amortization	—			(2,140		)	—		(12,845		)	—		(5,736		)	(20,721		)
December 31, 2016	5,350			(2,548		)	179,700		(15,509		)	6,512		(6,290		)	167,215
Acquisition of Code Plus	—			—			2,300		—			500		—			2,800
Acquisition of TexPly	—			—			13,600		—			—		—			13,600
Amortization	—			(2,010		)	—		(13,785		)	—		(208		)	(16,003		)
December 31, 2017	5,350			(4,558		)	195,600		(29,294		)	7,012		(6,498		)	167,612
Acquisition of Shone Lumber	—			—			7,000		—			—		—			7,000
Disposition of Coleman Floor	(1,000		)	291			—		—			—		—			(709		)
Amortization	—			(83		)	—		(14,743		)	—		(189		)	(15,015		)
December 31, 2108	$	4,350		$	(4,350	)	$	202,600	$	(44,037	)	$	7,012	$	(6,687	)	$	158,888

Aggregate amortization expense was $15.0 million, $16.0 million and $20.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. Based upon current assumptions, the Company expects that its definite-lived intangible assets will be amortized according to the following schedule:



(in thousands)
2019	$	14,972
2020	14,972
2021	14,972
2022	14,897
2023	14,872
Thereafter	84,203
	$	158,888