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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract] |
Schedule of Inventory | Inventories of materials and supplies, emissions allowances, stored natural gas and fuel stock are recorded at average cost and consisted of the following as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Materials and supplies |  | $ | 81,651 |  |  | $ | 75,766 |
Emission allowances |  |  | 56,097 |  |  |  | — |
Stored natural gas |  |  | 16,272 |  |  |  | 26,788 |
Fuel stock |  |  | 5,964 |  |  |  | 5,120 |
Total |  | $ | 159,984 |  |  | $ | 107,674 |
Schedule of Other Current Assets | Other current assets consisted of the following as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities |  | $ | — |  |  | $ | 66,142 |
Prepayments |  |  | 52,752 |  |  |  | 30,201 |
Income taxes receivable |  |  | 29,234 |  |  |  | 30,740 |
Derivative assets net of collateral |  |  | 11,821 |  |  |  | 18,198 |
Other |  |  | 9,977 |  |  |  | 5,886 |
Total |  | $ | 103,784 |  |  | $ | 151,167 |
Other Property and Investments-Net and Other Non-Current Assets | Other property and investments-net and other non-current assets consisted of the following as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Equity investments |  | $ | 153,350 |  |  | $ | 147,809 |
Operating lease ROU assets |  |  | 67,585 |  |  |  | 68,238 |
Finance lease ROU assets |  |  | 36,414 |  |  |  | 40,056 |
Non-utility property |  |  | 33,813 |  |  |  | 25,401 |
Notes receivable |  |  | 15,287 |  |  |  | 17,954 |
Long-term prepaid license fees |  |  | 19,448 |  |  |  | 17,936 |
Pension assets |  |  | 32,997 |  |  |  | 13,382 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Deferred compensation assets |  |  | 7,794 |  |  |  | 7,541 |
Other |  |  | 15,750 |  |  |  | 15,221 |
Total |  | $ | 393,985 |  |  | $ | 365,085 |
Other Current Liabilities | Other current liabilities consisted of the following as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Accrued taxes other than income taxes |  | $ | 31,928 |  |  | $ | 38,568 |
Employee paid time off accruals |  |  | 32,072 |  |  |  | 29,279 |
Accrued interest |  |  | 23,539 |  |  |  | 20,863 |
Pensions and other postretirement benefits |  |  | 14,082 |  |  |  | 15,625 |
Derivative liabilities |  |  | 17,217 |  |  |  | 26,910 |
Climate Commitment Act obligations |  |  | 19,081 |  |  |  | — |
Deferred wholesale revenue |  |  | — |  |  |  | 8,481 |
Other |  |  | 54,017 |  |  |  | 49,689 |
Total |  | $ | 191,936 |  |  | $ | 189,415 |
Schedule of Other Non-Current Liabilities and Deferred Credits | Other non-current liabilities and deferred credits consisted of the following as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Operating lease liabilities |  | $ | 63,559 |  |  | $ | 64,284 |
Finance lease liabilities |  |  | 39,095 |  |  |  | 42,495 |
Deferred investment tax credits |  |  | 28,233 |  |  |  | 28,784 |
Climate Commitment Act obligations |  |  | 26,026 |  |  |  | — |
Asset retirement obligations |  |  | 18,058 |  |  |  | 15,783 |
Derivative liabilities |  |  | 17,902 |  |  |  | 7,892 |
Other |  |  | 17,357 |  |  |  | 16,617 |
Total |  | $ | 210,230 |  |  | $ | 175,855 |

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