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Rate and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2019
Regulated Operations [Abstract] |
Schedule of regulatory assets | We have recorded certain costs as regulatory assets because we expect full recovery of, or are currently recovering, these costs in the rates we charge customers. These deferred costs have been excluded from rate base and, therefore, we are not earning a return on the unamortized balances. These items are detailed as follows:
|  | (Thousands of Dollars) |  |
|  | December 31, |  | Remaining
Regulatory Assets |  | 2018 |  | 2017 |  | Recovery Periods
Retirement Benefits |  | $ | 44,281 |  |  | $ | 39,158 |  |  | Various
Income Taxes |  |  | 60,151 |  |  |  | 55,232 |  |  | Various
Rate Cases, Tank Painting, and Other |  |  | 6,047 |  |  |  | 4,846 |  |  | 2-10 years
Total |  | $ | 110,479 |  |  | $ | 99,236 |  |  |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + 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 http://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 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
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