INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2021

INTANGIBLE ASSETS

INTANGIBLE ASSETS

6.    INTANGIBLE ASSETS

Intangible assets on the Company’s condensed consolidated balance sheets consist of the following (in thousands):

		June 30, 2021						December 31, 2020
		Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
	Life	Amount		Amortization		Value		Amount		Amortization		Value
Customer lists	8 - 17 years	$	69,489	$	(25,611)	$	43,878	$	69,833	$	(23,636)	$	46,197
Trade name	10 - 19 years		13,951		(5,497)		8,454		14,055		(5,061)		8,994
Design and technologies	10 - 15 years		15,295		(5,225)		10,070		15,531		(4,874)		10,657
Patents	17 years		24		(14)		10		24		(13)		11
Total		$	98,759	$	(36,347)	$	62,412	$	99,443	$	(33,584)	$	65,859

Amortization expense for intangible assets was $1,511 and $1,483 for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, amortization expense was $3,023 and $2,924, respectively.

Estimated future intangible asset amortization expense as of June 30, 2021 is as follows (in thousands):

	Estimated
	Amortization Expense
Remainder of 2021	$	3,011
2022		6,073
2023		6,087
2024		5,759
2025		5,741
2026		5,729
Thereafter		30,012
Total estimated amortization expense	$	62,412