ACQUIRED INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite Lived Intangible Assets

The following table presents the detail of acquired intangible assets as of the periods presented (in thousands):

	Balance at December 31, 2019
	Cost		Accumulated Amortization		Net
Technology assets	$	53,900	$	(31,873)	$	22,027
Customer assets	44,000		(6,934)		37,066
Trade name	11,300		(4,473)		6,827
Other	5,299		(2,140)		3,159
Total	$	114,499	$	(45,420)	$	69,079

	Balance at December 31, 2018
	Cost		Accumulated Amortization		Net
Technology assets	$	45,978	$	(28,420)	$	17,558
Customer assets	57,109		(8,068)		49,041
Trade name	11,300		(1,648)		9,652
Other	2,246		(1,395)		851
Total	$	116,633	$	(39,531)	$	77,102

The changes to the carrying value of intangible assets were as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Acquired intangible assets, net, beginning of the period	$	77,102	$	14,334	$	19,292
Acquisitions	14,559		75,871		2,657
Amortization expense	(15,000)		(13,103)		(7,615)
Sale of asset group (Note 8)	(7,582)		—		—
Acquired intangible assets, net, end of the period	$	69,079	$	77,102	$	14,334

Schedule of Annual Future Amortization Expense of Intangible Assets

The total estimated future amortization expense of these intangible assets as of December 31, 2019 is as follows (in thousands):

2020	$	12,800
2021	11,829
2022	10,134
2023	8,917
2024	5,940
Thereafter	19,459
Total	$	69,079