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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 146,683 | $ 154,621
Less: current regulatory assets, net | 738 | 2,629
Total regulatory assets, net, less current portion | 145,945 | 151,992
Regulatory assets, net not earning a return | 86,113 | 84,887
Income tax temporary differences, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 33,811 | 22,420
Postretirement pensions and other postretirement benefits |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 64,934 | 62,197
Business combinations debt premium, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 18,031 | 19,937
Balancing and memorandum accounts, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 22,583 | 38,334
Water Rate Adjustment |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | (2,800) | 2,588
Other, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 10,124 | $ 9,145

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123406419&loc=d3e44360-110383 + Details
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