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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Regulatory Assets [Line Items] |  |
Authorized revenue, threshold percentage | 2.00% |
Regulatory assets, net not earning a return | $ 43,141 | $ 66,373
Regulatory assets: |  |
Total regulatory assets | 240,186 | 265,775
Less: current regulatory asset | 4,276 | 19,740
Regulatory assets, less current portion | 235,910 | 246,035
Regulatory liabilities: |  |
Regulatory Liabilities | 464,167 | 122,432
Less: current regulatory liabilities | 3,059 | 3,672
Regulatory liabilities, less current portion | $ 461,108 | 118,760
Minimum |  |
Regulatory liabilities: |  |
Estimated service lives of assets | 4 years |
Maximum |  |
Regulatory liabilities: |  |
Estimated service lives of assets | 100 years |
Cost of removal |  |
Regulatory liabilities: |  |
Regulatory Liabilities | $ 346,418 | 0
Cost of removal | Public Utilities, Property, Plant and Equipment, Accumulated Depreciation |  |
Regulatory liabilities: |  |
Regulatory Liabilities |  | 316,647
Future income tax benefits due to customers |  |
Regulatory liabilities: |  |
Regulatory Liabilities | 88,610 | 94,426
Unrecognized pensions and other postretirement benefits |  |
Regulatory liabilities: |  |
Regulatory Liabilities | 20,196 | 14,307
Revenue adjustment mechanisms |  |
Regulatory liabilities: |  |
Regulatory Liabilities | 5,536 | 9,528
Other regulatory liabilities |  |
Regulatory liabilities: |  |
Regulatory Liabilities | 3,407 | 4,171
Future income tax benefits due to customers |  |
Regulatory assets: |  |
Total regulatory assets | 157,669 | 137,860
Unrecognized pensions and other postretirement benefits |  |
Regulatory assets: |  |
Total regulatory assets | 24,593 | 45,799
Business combinations debt premium |  |
Regulatory assets: |  |
Total regulatory assets | 14,855 | 17,396
Employee benefit costs |  |
Regulatory assets: |  |
Total regulatory assets | 9,815 | 8,068
MWRAM |  |
Regulatory assets: |  |
Total regulatory assets | 9,361 | 10,864
Customer Assistance Program (“CAP”) balancing account |  |
Regulatory assets: |  |
Total regulatory assets | 5,457 | 3,417
Catastrophic event memorandum accounts (“CEMA”) |  |
Regulatory assets: |  |
Total regulatory assets | 4,819 | 3,485
2022 general rate case interim memorandum account |  |
Regulatory assets: |  |
Total regulatory assets | 4,571 | 20,650
Water supply costs |  |
Regulatory assets: |  |
Total regulatory assets | 583 | 9,873
Other |  |
Regulatory assets: |  |
Total regulatory assets | $ 8,463 | $ 8,363

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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- Definition Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481849/980-340-55-2 + Details
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