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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract] |
Materials and Supplies, Fuel Stock and Stored Natural Gas | Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for regulated operations and the lower of cost or market for non-regulated operations and consisted of the following as of December 31 (dollars in thousands):
|  | 2021 |  |  | 2020 |
Materials and supplies |  | $ | 62,003 |  |  | $ | 53,258 |
Fuel stock |  |  | 5,126 |  |  |  | 4,658 |
Stored natural gas |  |  | 17,604 |  |  |  | 9,535 |
Total |  | $ | 84,733 |  |  | $ | 67,451 |
Schedule of Other Current Assets | Other current assets consisted of the following as of December 31 (dollars in thousands):
|  | 2021 |  |  | 2020 |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities |  | $ | 21,477 |  |  | $ | 4,336 |
Prepayments |  |  | 24,387 |  |  |  | 24,411 |
Income taxes receivable |  |  | 29,615 |  |  |  | 49,814 |
Other |  |  | 5,275 |  |  |  | 6,324 |
Total |  | $ | 80,754 |  |  | $ | 84,885 |
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):
|  | 2021 |  |  | 2020 |
Operating lease ROU assets |  | $ | 70,133 |  |  | $ | 71,891 |
Finance lease ROU assets |  |  | 43,697 |  |  |  | 47,338 |
Non-utility property |  |  | 20,033 |  |  |  | 19,508 |
Equity investments |  |  | 91,057 |  |  |  | 59,318 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Notes receivable |  |  | 14,949 |  |  |  | 14,454 |
Deferred compensation assets |  |  | 9,513 |  |  |  | 9,174 |
Assets held for sale (1) |  |  | — |  |  |  | 3,462 |
Other |  |  | 19,614 |  |  |  | 26,947 |
Total |  | $ | 280,543 |  |  | $ | 263,639 |
(1) The Company sold certain subsidiary assets associated with Steam Plant Square and Brew Pub during 2021.
Other Current Liabilities | Other current liabilities consisted of the following as of December 31 (dollars in thousands):
|  | 2021 |  |  | 2020 |
Accrued taxes other than income taxes |  | $ | 41,706 |  |  | $ | 45,099 |
Derivative liabilities |  |  | 28,801 |  |  |  | 14,008 |
Employee paid time off accruals |  |  | 27,741 |  |  |  | 26,495 |
Accrued interest |  |  | 17,538 |  |  |  | 17,083 |
Pensions and other postretirement benefits |  |  | 13,582 |  |  |  | 11,987 |
Other |  |  | 39,493 |  |  |  | 35,159 |
Total |  | $ | 168,861 |  |  | $ | 149,831 |
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):
|  | 2021 |  |  | 2020 |
Operating lease liabilities |  | $ | 66,068 |  |  | $ | 67,716 |
Finance lease liabilities |  |  | 45,730 |  |  |  | 48,815 |
Deferred investment tax credits |  |  | 29,313 |  |  |  | 29,866 |
Asset retirement obligations |  |  | 17,142 |  |  |  | 17,194 |
Derivative liabilities |  |  | 4,525 |  |  |  | 37,427 |
Other |  |  | 15,347 |  |  |  | 13,981 |
Total |  | $ | 178,125 |  |  | $ | 214,999 |

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