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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2020
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 our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |
Materials and supplies |  | $ | 53,258 |  |  | $ | 47,402 |
Fuel stock |  |  | 4,658 |  |  |  | 4,875 |
Stored natural gas |  |  | 9,535 |  |  |  | 14,306 |
Total |  | $ | 67,451 |  |  | $ | 66,583 |
Schedule of Other Current Assets | Other current assets consisted of the following as of December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities |  | $ | 4,336 |  |  | $ | 4,434 |
Prepayments |  |  | 24,411 |  |  |  | 19,652 |
Income taxes receivable |  |  | 49,814 |  |  |  | 11,047 |
Other |  |  | 6,324 |  |  |  | 5,009 |
Total |  | $ | 84,885 |  |  | $ | 40,142 |
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):
|  | 2020 |  |  | 2019 |
Operating lease ROU assets |  | $ | 71,891 |  |  | $ | 69,746 |
Finance lease ROU assets |  |  | 47,338 |  |  |  | 50,980 |
Non-utility property |  |  | 19,508 |  |  |  | 27,159 |
Equity investments |  |  | 59,318 |  |  |  | 51,258 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Notes receivable |  |  | 14,454 |  |  |  | 14,060 |
Deferred compensation assets |  |  | 9,174 |  |  |  | 8,948 |
Assets held for sale (1) |  |  | 3,462 |  |  |  | — |
Other |  |  | 26,947 |  |  |  | 23,394 |
Total |  | $ | 263,639 |  |  | $ | 257,092 |
| (1) | The Company is in the process of selling certain subsidiary assets associated with Steam Plant Square and Brew Pub.
Other Current Liabilities | Other current liabilities consisted of the following as of December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |
Accrued taxes other than income taxes |  | $ | 45,099 |  |  | $ | 36,965 |
Derivative liabilities |  |  | 14,008 |  |  |  | 10,928 |
Employee paid time off accruals |  |  | 26,495 |  |  |  | 22,343 |
Accrued interest |  |  | 17,083 |  |  |  | 16,486 |
Pensions and other postretirement benefits |  |  | 11,987 |  |  |  | 8,826 |
Other |  |  | 35,159 |  |  |  | 35,431 |
Total |  | $ | 149,831 |  |  | $ | 130,979 |
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):
|  | 2020 |  |  | 2019 |
Operating lease liabilities |  | $ | 67,716 |  |  | $ | 65,565 |
Finance lease liabilities |  |  | 48,815 |  |  |  | 51,750 |
Deferred investment tax credits |  |  | 29,866 |  |  |  | 30,444 |
Asset retirement obligations |  |  | 17,194 |  |  |  | 20,338 |
Derivative liabilities |  |  | 37,427 |  |  |  | 19,685 |
Other |  |  | 13,981 |  |  |  | 13,407 |
Total |  | $ | 214,999 |  |  | $ | 201,189 |

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