GOODWILL AND INTANGIBLE ASSETS:

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

The following table represents changes in the carrying amount of goodwill:



	(in thousands)
Carrying amount of goodwill at December 31, 2015	$	200,743
Acquisitions	275,294
Adjustments	—
Balance as of June 30, 2016	$	476,037

The carrying amounts of intangible assets as of June 30, 2016 were as follows:



	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(in thousands)
Licensed technology	$	2,638	$	(1,771	)	$	867
Developed technology	251,074		(56,298		)	194,776
Customer relationships	69,776		(14,205		)	55,571
Backlog	11,300		(8,399		)	2,901
Trade names	5,600		(657		)	4,943
Total finite-lived amortizable intangible assets	340,388		(81,330		)	259,058
In-process research and development	33,700		—			33,700
Total intangible assets	$	374,088	$	(81,330	)	$	292,758

The carrying amounts of intangible assets as of December 31, 2015 were as follows:



	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(in thousands)
Licensed technology	$	2,554	$	(1,589	)	$	965
Developed technology	69,828		(40,408		)	29,420
Customer relationships	13,376		(11,607		)	1,769
Total intangible assets	$	85,758	$	(53,604	)	$	32,154

Amortization expense of intangible assets totaled approximately $16.0 million and $2.6 million for the three months ended June 30, 2016 and 2015, respectively. Amortization expense of intangible assets totaled approximately $27.7 million and $4.9 million for the six months ended June 30, 2016 and 2015, respectively.

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



	(in thousands)
2016 (remaining six months)	$	27,765
2017	49,722
2018	46,736
2019	41,589
2020 and thereafter	93,246
Total	$	259,058

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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