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Utility Plant Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Utility Plant Intangible Assets | Utility Plant Intangible Assets Intangible assets consist of a concession fee paid to the City of Cupertino of $6,800 for operating the City of Cupertino municipal water system, $13,400 related to the purchase premium for customer relationships and other intangibles of $14,967 as of December 31, 2020. Other intangibles primarily consist of $3,999 which was paid for service area and water rights related to CLWSC, $5,984 for infrastructure related to the Cupertino service concession arrangement, $1,400 for customer relationships and $1,040 incurred in conjunction with Valley Water water contracts related to the operation of SJWC. All intangible assets are recorded at cost and are primarily being amortized using the straight-line method over the legal or estimated economic life of the asset ranging from 5 to 70 years. Amortization expense for the intangible assets was $1,401, $745 and $647 for the years ended December 31, 2020, 2019 and 2018, respectively. Amortization expense for 2021 through 2025 and thereafter is anticipated to be $1,401 per year. The costs of intangible assets as of December 31, 2020 and 2019 are as follows:
| 2020 |  | 2019
Concession fees | $ | 6,800 |  |  | 6,800 |
Purchase premium customer relationships | 13,400 |  |  | 13,400 |
Other intangibles | 14,967 |  |  | 13,224 |
Intangible assets | 35,167 |  |  | 33,424 |
Less: Accumulated amortization |  |  |
Concession fees | 6,324 |  |  | 6,052 |
Purchase premium customer relationships | 1,094 |  |  | 201 |
Other intangibles | 6,479 |  |  | 6,926 |
Net intangible assets | $ | 21,270 |  |  | 20,245 |

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- Definition The entire disclosure for all or part of the information related to 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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