Goodwill and Acquired Intangible Assets

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 were as follows (in thousands):



	2014		2013
Beginning balance	$	757,368	$	723,701
Additions	293,926		35,606
Disposals	—		(1,939		)
Ending balance	$	1,051,294	$	757,368

The addition to goodwill during the year ended December 31, 2014 was related to the acquisition of Prolexic Technologies, Inc. ("Prolexic"). The additions to goodwill during the year ended December 31, 2013 were related to the acquisitions of strategic network assets from AT&T Services, Inc. ("AT&T") and of Velocius. The disposal of goodwill during the year ended December 31, 2013 was related to the sale of the Company's Advertising Decision Solutions ("ADS") business.

Acquired intangible assets that are subject to amortization consisted of the following as of December 31, 2014 and 2013 (in thousands):



	December 31, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Completed technologies	$	88,331	$	(45,537	)	$	42,794	$	65,631	$	(35,476	)	$	30,155
Customer relationships	173,600		(91,160		)	82,440		115,100		(75,563		)	39,537
Non-compete agreements	8,890		(4,224		)	4,666		7,950		(2,623		)	5,327
Trademarks and trade names	3,700		(1,188		)	2,512		3,400		(990		)	2,410
Acquired license rights	490		(490		)	—		490		(490		)	—
Total	$	275,011	$	(142,599	)	$	132,412	$	192,571	$	(115,142	)	$	77,429

Aggregate amortization expense of acquired intangible assets for the years ended December 31, 2014, 2013 and 2012 was $32.1 million, $21.5 million and $21.0 million, respectively. Based on intangible assets held as of December 31, 2014, amortization expense is expected to be approximately $26.8 million, $25.2 million, $23.1 million, $16.2 million and $12.6 million for the years ending December 31, 2015, 2016, 2017, 2018 and 2019, respectively.

- 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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