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Income Taxes - Federal Statutory Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income before income taxes | $ 90,943 | $ 82,324 | $ 68,847
Income Tax Statutory Rate Reconciliation [Abstract] |  |  |
Income tax at federal statutory rate | 19,098 | 17,288 | 14,458
Increase (decrease) in taxes attributable to: |  |  |
State taxes, net of federal income tax benefit | 6,001 | 5,328 | 4,572
Uncertain tax positions | (4,330) | 1,483 | 1,678
Property flow-through | (9,045) | (13,091) | (8,573)
Reversal of excess deferred taxes recognized in regulatory liability | (3,625) | (3,885) | (3,295)
Pension flow-through | (597) | 27 | 429
Stock-based compensation | (491) | (297) | (331)
Other items, net | (1,055) | 1,643 | (569)
Income tax expense | $ 5,956 | $ 8,496 | $ 8,369

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