INTANGIBLE ASSETS

6 Months Ended

Jun. 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):

		June 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	$	38,183	$	(8,996	)	$	29,187	$	34,149	$	(7,785	)	$	26,364
Trade name	10 - 17 years	6,108		(2,040		)	4,068		4,775		(1,793		)	2,982
Design and technologies	8 - 15 years	4,780		(1,765		)	3,015		2,189		(1,570		)	619
Patents		24		(6		)	18		24		(5		)	19
Total		$	49,095	$	(12,807	)	$	36,288	$	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 $828 and $660 for the quarters ending June 30, 2016 and 2015, respectively; and $1,607 and $1,322 for the six months ended June 30, 2016 and 2015, respectively.

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

	Estimated Amortization Expense
Remainder of 2016	$	1,602
2017	3,204
2018	3,204
2019	3,204
2020	3,204
Thereafter	21,870
Total estimated amortization expense	$	36,288