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Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Materials and supplies |  | $ | 48,867 |  |  | $ | 47,402 |
Fuel stock |  |  | 5,208 |  |  |  | 4,875 |
Stored natural gas |  |  | 13,258 |  |  |  | 14,306 |
Total |  | $ | 67,333 |  |  | $ | 66,583 |
Schedule of Other Current Assets | Other current assets consisted of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities |  | $ | — |  |  | $ | 4,434 |
Prepayments |  |  | 21,813 |  |  |  | 19,652 |
Income taxes receivable |  |  | 1,941 |  |  |  | 11,047 |
Other |  |  | 18,608 |  |  |  | 5,009 |
Total |  | $ | 42,362 |  |  | $ | 40,142 |
Net Utility Property | Net utility property consisted of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Utility plant in service |  | $ | 6,613,219 |  |  | $ | 6,462,993 |
Construction work in progress |  |  | 195,937 |  |  |  | 164,941 |
Total |  |  | 6,809,156 |  |  |  | 6,627,934 |
Less: Accumulated depreciation and amortization |  |  | 1,926,023 |  |  |  | 1,830,927 |
Total net utility property |  | $ | 4,883,133 |  |  | $ | 4,797,007 |
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 June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Operating lease ROU assets |  | $ | 72,588 |  |  | $ | 69,746 |
Finance lease ROU assets |  |  | 49,159 |  |  |  | 50,980 |
Non-utility property |  |  | 26,774 |  |  |  | 27,159 |
Equity investments |  |  | 51,748 |  |  |  | 51,258 |
Investment in affiliated trust |  |  | 11,547 |  |  |  | 11,547 |
Notes receivable |  |  | 16,375 |  |  |  | 14,060 |
Deferred compensation assets |  |  | 8,435 |  |  |  | 8,948 |
Other |  |  | 25,842 |  |  |  | 23,394 |
Total |  | $ | 262,468 |  |  | $ | 257,092 |
Other Current Liabilities | Other current liabilities consisted of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
Accrued taxes other than income taxes |  | $ | 38,734 |  |  | $ | 36,965 |
Employee paid time off accruals |  |  | 25,728 |  |  |  | 22,343 |
Accrued interest |  |  | 16,226 |  |  |  | 16,486 |
Current portion of pensions and other postretirement benefits |  |  | 11,700 |  |  |  | 8,826 |
Income taxes payable |  |  | — |  |  |  | 298 |
Derivative liabilities |  |  | 3,064 |  |  |  | 10,928 |
Other current liabilities |  |  | 27,806 |  |  |  | 35,133 |
Total other current liabilities |  | $ | 123,258 |  |  | $ | 130,979 |
Schedule of Other Non-Current Liabilities and Deferred Credits | Other non-current liabilities and deferred credits consisted of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
Operating lease liabilities |  | $ | 70,330 |  |  | $ | 65,565 |
Finance lease liabilities |  |  | 50,283 |  |  |  | 51,750 |
Deferred investment tax credits |  |  | 30,162 |  |  |  | 30,444 |
Asset retirement obligations |  |  | 20,236 |  |  |  | 20,338 |
Derivative liabilities |  |  | 67,038 |  |  |  | 19,685 |
Other |  |  | 13,441 |  |  |  | 13,407 |
Total |  | $ | 251,490 |  |  | $ | 201,189 |
Schedule of Regulatory Assets and Liabilities | Regulatory assets and liabilities consisted of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
|  | Current |  |  | Non-Current |  |  | Current |  |  | Non-Current |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives |  | $ | 309 |  |  | $ | — |  |  | $ | 6,310 |  |  | $ | 264 |
Decoupling surcharge |  |  | 10,345 |  |  |  | 18,514 |  |  |  | 12,098 |  |  |  | 14,806 |
Pension and other postretirement benefit plans |  |  | — |  |  |  | 203,471 |  |  |  | — |  |  |  | 208,754 |
Interest rate swaps |  |  | — |  |  |  | 244,672 |  |  |  | — |  |  |  | 168,594 |
Deferred income taxes |  |  | — |  |  |  | 98,879 |  |  |  | — |  |  |  | 95,752 |
Settlement with Coeur d'Alene Tribe |  |  | — |  |  |  | 40,677 |  |  |  | — |  |  |  | 41,332 |
AFUDC above FERC allowed rate |  |  | — |  |  |  | 41,912 |  |  |  | — |  |  |  | 40,749 |
Demand side management programs |  |  | — |  |  |  | 6,538 |  |  |  | — |  |  |  | 12,170 |
Utility plant to be abandoned |  |  | — |  |  |  | 30,700 |  |  |  | — |  |  |  | 31,291 |
Other regulatory assets |  |  | 523 |  |  |  | 66,727 |  |  |  | 3,443 |  |  |  | 57,090 |
Total regulatory assets |  | $ | 11,177 |  |  | $ | 752,090 |  |  | $ | 21,851 |  |  | $ | 670,802 |
Regulatory Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax related liabilities |  | $ | 13,335 |  |  | $ | 400,564 |  |  | $ | 23,803 |  |  | $ | 407,549 |
Deferred natural gas costs |  |  | 2,778 |  |  |  | — |  |  |  | 3,189 |  |  |  | — |
Deferred power costs |  |  | 21,692 |  |  |  | 20,112 |  |  |  | 14,155 |  |  |  | 23,544 |
Decoupling rebate |  |  | 796 |  |  |  | 3,359 |  |  |  | 255 |  |  |  | 2,398 |
Provision for rate refund (Washington remand case) |  |  | 7,339 |  |  |  | — |  |  |  | 3,565 |  |  |  | — |
Utility plant retirement costs |  |  | — |  |  |  | 322,138 |  |  |  | — |  |  |  | 312,403 |
Interest rate swaps |  |  | — |  |  |  | 15,773 |  |  |  | — |  |  |  | 17,088 |
Other regulatory liabilities |  |  | 3,689 |  |  |  | 16,880 |  |  |  | 6,748 |  |  |  | 12,454 |
Total regulatory liabilities |  | $ | 49,629 |  |  | $ | 778,826 |  |  | $ | 51,715 |  |  | $ | 775,436 |

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