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Balance Sheet Components (Tables) | 9 Months Ended
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Sep. 30, 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 our regulated operations and the lower of cost or net realizable value for our non-regulated operations and consisted of the following as of September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Materials and supplies |  | $ | 58,238 |  |  | $ | 53,258 |
Fuel stock |  |  | 5,154 |  |  |  | 4,658 |
Stored natural gas |  |  | 23,811 |  |  |  | 9,535 |
Total |  | $ | 87,203 |  |  | $ | 67,451 |
Schedule of Other Current Assets | Other current assets consisted of the following as of September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities |  | $ | 10,604 |  |  | $ | 4,336 |
Prepayments |  |  | 18,523 |  |  |  | 24,411 |
Income taxes receivable |  |  | 39,151 |  |  |  | 49,814 |
Other |  |  | 13,106 |  |  |  | 6,324 |
Total |  | $ | 81,384 |  |  | $ | 84,885 |
Schedule of Net Utility Property Recorded at Original Cost Net of Accumulated Depreciation | Net utility property, which is recorded at original cost net of accumulated depreciation, consisted of the following as of September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Utility plant in service |  | $ | 7,067,842 |  |  | $ | 6,809,797 |
Construction work in progress |  |  | 204,384 |  |  |  | 175,767 |
Total |  |  | 7,272,226 |  |  |  | 6,985,564 |
Less: Accumulated depreciation and amortization |  |  | 2,103,401 |  |  |  | 1,993,952 |
Total net utility property |  | $ | 5,168,825 |  |  | $ | 4,991,612 |
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 September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Operating lease ROU assets |  | $ | 70,578 |  |  | $ | 71,891 |
Equity investments |  |  | 83,496 |  |  |  | 59,318 |
Finance lease ROU assets |  |  | 44,607 |  |  |  | 47,338 |
Non-utility property |  |  | 19,248 |  |  |  | 19,508 |
Notes receivable |  |  | 14,759 |  |  |  | 14,454 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Deferred compensation assets |  |  | 9,917 |  |  |  | 9,174 |
Assets held for sale (1) |  |  | — |  |  |  | 3,462 |
Other |  |  | 23,848 |  |  |  | 26,947 |
Total |  | $ | 278,000 |  |  | $ | 263,639 |
(1) During the second quarter of 2021, the Company sold certain subsidiary assets associated with the Spokane Steam Plant.
Other Current Liabilities | Other current liabilities consisted of the following as of September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |
Accrued taxes other than income taxes |  | $ | 42,945 |  |  | $ | 45,099 |
Derivative liabilities |  |  | 24,797 |  |  |  | 14,008 |
Employee paid time off accruals |  |  | 28,321 |  |  |  | 26,495 |
Accrued interest |  |  | 29,278 |  |  |  | 17,083 |
Pensions and other postretirement benefits |  |  | 10,970 |  |  |  | 11,987 |
Other |  |  | 35,417 |  |  |  | 35,159 |
Total other current liabilities |  | $ | 171,728 |  |  | $ | 149,831 |
Schedule of Other Non-Current Liabilities and Deferred Credits | Other non-current liabilities and deferred credits consisted of the following as of September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |
Operating lease liabilities |  | $ | 69,475 |  |  | $ | 67,716 |
Finance lease liabilities |  |  | 46,501 |  |  |  | 48,815 |
Deferred investment tax credits |  |  | 29,452 |  |  |  | 29,866 |
Asset retirement obligations |  |  | 16,425 |  |  |  | 17,194 |
Derivative liabilities |  |  | 5,580 |  |  |  | 37,427 |
Other |  |  | 15,542 |  |  |  | 13,981 |
Total |  | $ | 182,975 |  |  | $ | 214,999 |
Schedule of Regulatory Assets and Liabilities | Regulatory assets and liabilities consisted of the following as of September 30, 2021 and December 31, 2020 (dollars in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | Current |  |  | Non-Current |  |  | Current |  |  | Non-Current |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives |  | $ | 11,159 |  |  | $ | — |  |  | $ | 2,073 |  |  | $ | 5,722 |
Decoupling surcharge |  |  | 9,036 |  |  |  | 12,641 |  |  |  | 7,123 |  |  |  | 17,123 |
Deferred natural gas costs |  |  | 9,967 |  |  |  | 4,758 |  |  |  | 2,308 |  |  |  | — |
Deferred power costs |  |  | 7,606 |  |  |  | 4,043 |  |  |  | 1,775 |  |  |  | 1,562 |
Pension and other postretirement benefit plans |  |  | — |  |  |  | 192,220 |  |  |  | — |  |  |  | 198,746 |
Interest rate swaps |  |  | — |  |  |  | 195,909 |  |  |  | — |  |  |  | 214,851 |
Deferred income taxes (1) |  |  | — |  |  |  | 242,782 |  |  |  | — |  |  |  | 108,517 |
Settlement with Coeur d'Alene Tribe |  |  | — |  |  |  | 39,205 |  |  |  | — |  |  |  | 40,043 |
AFUDC above FERC allowed rate |  |  | — |  |  |  | 45,093 |  |  |  | — |  |  |  | 47,393 |
Demand side management programs |  |  | — |  |  |  | 3,124 |  |  |  | — |  |  |  | 3,814 |
Utility plant to be abandoned |  |  | — |  |  |  | 29,684 |  |  |  | — |  |  |  | 28,916 |
COVID-19 deferrals |  |  | — |  |  |  | 15,648 |  |  |  | — |  |  |  | 8,166 |
Other regulatory assets |  |  | — |  |  |  | 90,845 |  |  |  | 394 |  |  |  | 75,590 |
Total regulatory assets |  | $ | 37,768 |  |  | $ | 875,952 |  |  | $ | 13,673 |  |  | $ | 750,443 |
Regulatory Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Income tax related liabilities (1) |  | $ | 52,843 |  |  | $ | 475,607 |  |  | $ | 14,952 |  |  | $ | 399,677 |
Deferred power costs |  |  | 10,512 |  |  |  | 9,136 |  |  |  | 20,299 |  |  |  | 17,570 |
Decoupling rebate |  |  | 2,717 |  |  |  | 10,283 |  |  |  | 1,447 |  |  |  | 1,519 |
Utility plant retirement costs |  |  | — |  |  |  | 344,061 |  |  |  | — |  |  |  | 325,832 |
Interest rate swaps |  |  | — |  |  |  | 16,757 |  |  |  | — |  |  |  | 15,046 |
COVID-19 deferrals |  |  | — |  |  |  | 12,673 |  |  |  | — |  |  |  | 10,949 |
Other regulatory liabilities |  |  | 9,487 |  |  |  | 17,834 |  |  |  | 9,737 |  |  |  | 14,227 |
Total regulatory liabilities |  | $ | 75,559 |  |  | $ | 886,351 |  |  | $ | 46,435 |  |  | $ | 784,820 |
(1) In 2021, the Company received regulatory approval in all jurisdictions to change to flow-through tax treatment of certain basis adjustments, which was $128.8 million as of September 30, 2021.

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