Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2020

GOODWILL AND OTHER INTANGIBLE ASSETS

The carrying value of goodwill from continuing operations as of December 31, 2020 and 2019 was as follows:


(in thousands)	Regulated Energy		Unregulated Energy		Total Goodwill
Balance at December 31, 2019	$	3,353	$	29,315	$	32,668
Additions (1)	4,264		1,799		6,063
Balance at December 31, 2020	$	7,617	$	31,114	$	38,731

(1)Includes goodwill from the purchase of operating assets of Elkton Gas in the third quarter of 2020 and Western Natural Gas in October 2020.

The annual impairment testing for 2020 and 2019 indicated no impairment of goodwill.

The carrying value and accumulated amortization of intangible assets subject to amortization as of December 31, 2020 and 2019 are as follows:


	As of December 31,
	2020				2019
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Customer relationships (1)	$	10,680	$	4,269	$	9,391	$	3,463
Non-Compete agreements (1)	2,375		768		2,252		451
Patents	452		236		452		118
Other	270		212		270		204
Total	$	13,777	$	5,485	$	12,365	$	4,236

(1) The customer relationship and non-compete agreements amounts includes $1.3 million and $0.1 million, respectively, recorded as a result of the purchase of the operating assets of Western Natural Gas in October 2020. The amounts also include customer relationship and non-compete agreements amounts of $4.6 million and $0.5 million, respectively, recorded as a result of the purchase of the operating assets of Boulden in December 2019.

The customer relationships, non-compete agreements, patents and other intangible assets acquired in the purchases of the operating assets of several companies are being amortized over a weighted average of 11 years. Amortization expense of intangible assets for the year ended December 31, 2020, 2019 and 2018 was $1.2 million, $0.8 million and $0.4 million, respectively. Amortization expense of intangible assets is expected to be $1.3 million for the year 2021, $1.0 million for the year 2022 and $0.9 million for the years 2023 through 2025.