INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2016

INTANGIBLE ASSETS

INTANGIBLE ASSETS

6.INTANGIBLE ASSETS

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

		September 30, 2016							December 31, 2015
	Life	Gross Amount		Accumulated amortization			Net Book Value		Gross Amount		Accumulated amortization			Net Book Value
Customer lists	8 - 15 years	$	38,241	$	(9,605	)	$	28,636	$	34,149	$	(7,785	)	$	26,364
Trade name	10 - 17 years	6,121		(2,163		)	3,958		4,775		(1,793		)	2,982
Design and technologies	8 - 15 years	4,825		(1,867		)	2,958		2,189		(1,570		)	619
Patents		24		(7		)	17		24		(5		)	19
Total		$	49,211	$	(13,642	)	$	35,569	$	41,137	$	(11,153	)	$	29,984

Intangible assets acquired from the Heidrive acquisition were approximately $7,710 (Note 2).

Amortization expense for intangible assets was $802 and $661 for the quarters ending September 30, 2016 and 2015, respectively; and $2,409 and $1,983 for the nine months ended September 30, 2016 and 2015, respectively.

Estimated future intangible asset amortization expense as of September 30, 2016 is as follows (in thousands):

	Estimated Amortization Expense
Remainder of 2016	$	803
2017	3,212
2018	3,212
2019	3,212
2020	3,212
2021	2,963
Thereafter	18,955
Total estimated amortization expense	$	35,569