INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2019

5. INTANGIBLE ASSETS

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


		December 31, 2019						December 31, 2018
		Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
	Life	Amount		amortization		Value		Amount		amortization		Value
Customer lists	8 - 17 years	$	64,314	$	(19,311)	$	45,003	$	64,439	$	(15,343)	$	49,096
Trade name	10 - 19 years		12,222		(4,114)		8,108		12,249		(3,305)		8,944
Design and technologies	10 - 15 years		12,927		(3,554)		9,373		13,023		(2,723)		10,300
Patents	17 years		24		(11)		13		24		(10)		14
Total		$	89,487	$	(26,990)	$	62,497	$	89,735	$	(21,381)	$	68,354

Intangible assets resulting from the acquisition of TCI were approximately $36,400 (Note 2). The intangible assets acquired consist of customer lists, a trade name and technology.

Intangible assets resulting from the acquisition of the Maval OE Steering business were approximately $3,870 (Note 2). The intangible assets acquired consist of customer lists.

Total amortization expense for intangible assets for the years 2019, 2018 and 2017 was $5,718, $3,655 and $3,219, respectively.

Estimated amortization expense for intangible assets is as follows (in thousands):


Year ending December 31,	Total
2020	$	5,719
2021		5,470
2022		5,470
2023		5,389
2024		5,087
Thereafter		35,362
	$	62,497