Goodwill and Acquired Intangible Assets

The changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017 were as follows (in thousands):



	2018			2017
Beginning balance	$	1,498,688		$	1,228,503
Acquisition of Soasta, Inc.	—			121,668
Acquisition of Nominum, Inc.	—			133,754
Measurement period adjustments	(6,667		)	4,217
Foreign currency translation	(4,617		)	10,546
Ending balance	$	1,487,404		$	1,498,688

Acquired intangible assets that are subject to amortization consisted of the following as of December 31, 2018 and 2017 (in thousands):



	December 31, 2018							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Completed technologies	$	145,091	$	(81,587	)	$	63,504	$	145,091	$	(65,283	)	$	79,808
Customer-related intangible assets	245,710		(144,786		)	100,924		245,310		(128,835		)	116,475
Non-compete agreements	700		(306		)	394		4,710		(3,975		)	735
Trademarks and trade names	7,200		(3,674		)	3,526		7,200		(2,959		)	4,241
Acquired license rights	490		(490		)	—		490		(490		)	—
Total	$	399,191	$	(230,843	)	$	168,348	$	402,801	$	(201,542	)	$	201,259

Aggregate expense related to amortization of acquired intangible assets for the years ended December 31, 2018, 2017 and 2016 was $33.3 million, $30.9 million and $26.6 million, respectively. Based on the Company's acquired intangible assets as of December 31, 2018, aggregate expense related to amortization of acquired intangible assets is expected to be approximately $36.6 million, $33.9 million, $28.0 million, $22.4 million and $17.1 million for the years ending December 31, 2019, 2020, 2021, 2022 and 2023, respectively.