GOODWILL AND INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS:

There has been no change in the carrying amount of goodwill of $473.9 million during the six months ended June 30, 2019.

The carrying amounts of intangible assets as of June 30, 2019 were as follows:

	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Useful Life
	(in thousands)							(in years)
Licensed technology	$	56,526	$	(34,470	)	$	22,056	1-8
Developed technology	285,443		(183,849		)	101,594		4-7
Customer relationships	69,776		(34,380		)	35,396		4-9
Trade names	5,600		(5,600		)	—		3
Total intangible assets	$	417,345	$	(258,299	)	$	159,046

The carrying amounts of intangible assets as of December 31, 2018 were as follows:

	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Useful Life
	(in thousands)							(in years)
Licensed technology	$	49,546	$	(30,062	)	$	19,484	1-8
Developed technology	285,443		(164,406		)	121,037		4-7
Customer relationships	69,776		(31,246		)	38,530		4-9
Trade names	5,600		(5,323		)	277		3
Total intangible assets	$	410,365	$	(231,037	)	$	179,328

Amortization expense of intangible assets totaled approximately $14.6 million and $16.5 million for the three months ended June 30, 2019 and 2018, respectively. Amortization expense of intangible assets totaled approximately $29.6 million and $32.8 million for the six months ended June 30, 2019 and 2018, respectively.

The estimated future amortization expense from amortizable intangible assets is as follows:

	(in thousands)
2019 (remainder of the year)	$	32,245
2020	53,723
2021	43,113
2022	13,077
2023	8,291
Thereafter	8,597
Total	$	159,046