(7)OTHER INTANGIBLE ASSETS

Other intangible assets which are included in Other long-term assets in the accompanying Consolidated Balance Sheets consisted of the following (in thousands):


							Acquisitions		Effect of
	December 31,						and		Foreign		December 31,
	2018		Amortization		Impairments		Adjustments		Currency		2019
Customer relationships, gross	$	123,527	$	—	$	—	$	38,540	$	(311)	$	161,756
Customer relationships - accumulated amortization		(43,223)		(11,055)		(423)		—		48		(54,653)
Other intangible assets, gross		4,575		—		—		8,600		(13)		13,162
Other intangible assets - accumulated amortization		(3,968)		(541)		(170)		—		10		(4,669)
Other intangible assets, net	$	80,911	$	(11,596)	$	(593)	$	47,140	$	(266)	$	115,596


							Acquisitions		Effect of
	December 31,						and		Foreign		December 31,
	2017		Amortization		Impairments		Adjustments		Currency		2018
Customer relationships, gross	$	127,431	$	—	$	—	$	1,956	$	(5,860)	$	123,527
Customer relationships - accumulated amortization		(35,217)		(10,546)		—		1,203		1,337		(43,223)
Other intangible assets, gross		4,784		—		—		—		(209)		4,575
Other intangible assets - accumulated amortization		(3,913)		(212)		—		—		157		(3,968)
Other intangible assets, net	$	93,085	$	(10,758)	$	—	$	3,159	$	(4,575)	$	80,911

The acquisitions recorded during 2019 relate to the purchase of FCR (see Note 2 for further information). The impairments recorded during 2019 relate to rogenSi intangible assets (see below)

The acquisitions and adjustments recorded during 2018 relate to the purchase of SCS (see Note 2 for further information) and the fair value of the Digital-PRG balance sheet (see below).

Digital - PRG

As of December 31, 2018, in connection with reclassifying a business unit from assets held for sale to assets held and used, a fair value assessment was completed and it was determined that due to continuing estimated losses, the fair value of the customer relationship balance was zero. The Company recorded a $0.7 million expense related to a fair value adjustment during the fourth quarter of 2018 which was included in Other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss).

Digital - rogenSi

In connection with reduced profitability of the rogenSi component of the TTEC Digital segment, an interim impairment analysis was completed during the second quarter of 2019. The long-lived assets reviewed for impairment consisted of the customer relationship intangible, intellectual property, and right of use assets. The Company completed an asset group recoverability evaluation based on the current estimated cash flow based on forecasted revenues and operating income using significant inputs not observable in the market (Level 3 inputs). Based on this calculation, the Company recorded an impairment expense of $2.0 million in the three months ended June 30, 2019, which was included in Impairment losses in the Consolidated Statements of Comprehensive Income (Loss). As part of the $2.0 million impairment $0.4 million was assigned to the customer relationship intangible asset and $0.2 million to the IP intangible asset. At December 31, 2019, the Company reviewed the evaluation completed as of June 30, 2019, and noted no material changes, thus no additional impairment is required.

Customer relationships are being amortized over the remaining weighted average useful life of 8.2 years and other intangible assets are being amortized over the remaining weighted average useful life of 5.5 years. Amortization expense related to intangible assets was $10.5 million, $10.8 million and $7.5 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Expected future amortization of other intangible assets as of December 31, 2019 is as follows (in thousands):


2020	$	14,942
2021		14,686
2022		14,066
2023		13,204
2024		11,122
Thereafter		47,576
Total	$	115,596