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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
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Goodwill and Other Intangible Assets | G OODWILL AND O THER I NTANGIBLE A SSETS The carrying value of goodwill as of December 31, 2018 and 2017 was as follows:
| As of December 31,
(in thousands) | 2018 |  | 2017
Goodwill |  |  |
Regulated Energy |  |  |
Florida Natural Gas Distribution(1) | $ | 3,353 |  |  | $ | 3,353 |
Unregulated Energy |  |  |
Mid-Atlantic Propane Operations | 2,147 |  |  | 674 |
Florida Propane Operations | 1,188 |  |  | 1,188 |
Aspire Energy | 10,119 |  |  | 10,119 |
Marlin Gas Services | 4,760 |  |  | — |
Natural Gas Marketing - PESCO | 4,270 |  |  | 4,270 |
Total Goodwill | $ | 25,837 |  |  | $ | 19,604 |
(1) Florida natural gas distribution includes Chesapeake Utilities' Central Florida Gas division, FPU and FPU's Indiantown and Fort Meade divisions. The annual impairment testing for 2018 and 2017 indicated no impairment of goodwill. The carrying value and accumulated amortization of intangible assets subject to amortization as of December 31, 2018 and 2017 are as follows:
| As of December 31,
| 2018 |  | 2017
(in thousands) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Customer lists | $ | 7,757 |  |  | $ | 3,664 |  |  | $ | 7,393 |  |  | $ | 2,880 |
Non-Compete agreements | 2,245 |  |  | 202 |  |  | 270 |  |  | 175 |
Other | 270 |  |  | 199 |  |  | 270 |  |  | 192 |
Total | $ | 10,272 |  |  | $ | 4,065 |  |  | $ | 7,933 |  |  | $ | 3,247 |
The customer lists, non-compete agreements and other intangibles acquired in the purchases of the operating assets of several companies are being amortized over five to 41 years. For the years ended December 31, 2018, 2017 and 2016, amortization expense of intangible assets was $818,000, $537,000, and $380,000, respectively. Amortization expense of intangible assets is expected to be $1.1 million for each of the years 2019, 2020 and 2021, $820,000 for 2022 and $813,000 for 2023.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- References No definition available. + Details
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