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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Goodwill and Other Intangible Assets GOODWILL AND OTHER INTANGIBLE ASSETS
The carrying value of goodwill from continuing operations as of December 31, 2021 and 2020 was as follows:
(in thousands)Regulated EnergyUnregulated EnergyTotal Goodwill
Balance at December 31, 2020$7,617 $31,114 $38,731 
Additions (1)
72 5,905 5,977 
Balance at December 31, 2021$7,689 $37,019 $44,708 
(1)Includes goodwill from the purchase of operating assets of Diversified Energy in December 2021 and Elkton Gas in the third quarter of 2020.

The annual impairment testing for the years 2021 and 2020 indicated no impairment of goodwill.
The carrying value and accumulated amortization of intangible assets subject to amortization as of December 31, 2021 and 2020 are as follows:
As of December 31,
 20212020
(in thousands)Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Customer relationships (1)
$16,814 $5,125 $10,680 $4,269 
Non-Compete agreements (1)
2,431 1,078 2,375 768 
Patents452 354 452 236 
Other270 218 270 212 
Total$19,967 $6,775 $13,777 $5,485 
(1) The customer relationship and non-compete agreements amounts include $6.1 million and less than $0.1 million, respectively, as a result of the purchase of the operating assets of Diversified Energy in December 2021 and $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 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 12 years. Amortization expense of intangible assets for the year ended December 31, 2021, 2020 and 2019 was $1.3 million, $1.2 million and $0.8 million, respectively. Amortization expense of intangible assets is expected to be $1.4 million for the year 2022, $1.3 million for the years 2023 through 2025, and $1.1 million for 2026.