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Balance Sheet Components Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Schedule of Other Current Assets [Table Text Block] | Other current assets consisted of the following as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities | $ | — |  |  | $ | 26,809 |
Prepayments | 24,515 |  |  | 17,536 |
Other | 6,084 |  |  | 9,665 |
Total | $ | 30,599 |  |  | $ | 54,010 |
Schedule of Inventory, Current [Table Text Block] | 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, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Materials and supplies | $ | 46,886 |  |  | $ | 47,403 |
Fuel stock | 6,332 |  |  | 4,869 |
Stored natural gas | 14,441 |  |  | 11,609 |
Total | $ | 67,659 |  |  | $ | 63,881 |
Public Utility Property, Plant, and Equipment [Table Text Block] | Net utility property consisted of the following as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Utility plant in service | $ | 6,262,789 |  |  | $ | 6,209,968 |
Construction work in progress | 191,845 |  |  | 160,598 |
Total | 6,454,634 |  |  | 6,370,566 |
Less: Accumulated depreciation and amortization | 1,769,980 |  |  | 1,721,636 |
Total net utility property | $ | 4,684,654 |  |  | $ | 4,648,930 |
Schedule of Other Current Assets [Table Text Block] | Other property and investments-net and other non-current assets consisted of the following as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Operating lease ROU assets | $ | 70,442 |  |  | $ | — |
Finance lease ROU assets | 52,800 |  |  | — |
Non-utility property | 28,438 |  |  | 31,355 |
Equity investments | 36,921 |  |  | 29,257 |
Investment in affiliated trust | 11,547 |  |  | 11,547 |
Notes receivable | 11,376 |  |  | 11,073 |
Deferred compensation assets | 8,557 |  |  | 8,400 |
Other | 20,549 |  |  | 23,065 |
Total | $ | 240,630 |  |  | $ | 114,697 |
Other Current Liabilities [Table Text Block] | Other current liabilities consisted of the following as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Accrued taxes other than income taxes | $ | 35,502 |  |  | $ | 36,858 |
Employee paid time off accruals | 22,092 |  |  | 20,992 |
Accrued interest | 16,536 |  |  | 16,704 |
Current portion of pensions and other postretirement benefits | 11,175 |  |  | 9,151 |
Derivative liabilities | 9,274 |  |  | 3,908 |
Other current liabilities | 29,590 |  |  | 32,745 |
Total other current liabilities | $ | 124,169 |  |  | $ | 120,358 |
Other Noncurrent Liabilities [Table Text Block] | Other non-current liabilities and deferred credits consisted of the following as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Operating lease liabilities | $ | 68,228 |  |  | $ | — |
Finance lease liabilities | 53,150 |  |  | — |
Deferred investment tax credits | 31,172 |  |  | 29,725 |
Asset retirement obligations | 18,595 |  |  | 18,266 |
Derivative liabilities | 27,198 |  |  | 10,300 |
Other | 13,058 |  |  | 12,740 |
Total | $ | 211,401 |  |  | $ | 71,031 |
Schedule Of Regulated Asset And Liability [Table Text Block] | Regulatory assets and liabilities consisted of the following as of June 30, 2019 and December 31, 2018 (dollars in thousands):
| June 30, 2019 |  | December 31, 2018
| Current |  | Non-Current |  | Current |  | Non-Current
Regulatory Assets |  |  |  |  |  |  |
Energy commodity derivatives | $ | 25,125 |  |  | $ | 10,764 |  |  | $ | 41,428 |  |  | $ | 16,866 |
Decoupling surcharge | 6,498 |  |  | 16,167 |  |  | 3,408 |  |  | 17,501 |
Pension and other postretirement benefit plans | — |  |  | 221,454 |  |  | — |  |  | 228,062 |
Interest rate swaps | — |  |  | 155,787 |  |  | — |  |  | 133,854 |
Deferred income taxes | — |  |  | 95,217 |  |  | — |  |  | 91,188 |
Settlement with Coeur d'Alene Tribe | — |  |  | 41,988 |  |  | — |  |  | 42,643 |
Demand side management programs | — |  |  | 13,705 |  |  | — |  |  | 19,674 |
Utility plant to be abandoned | — |  |  | 25,273 |  |  | — |  |  | 24,334 |
Other regulatory assets | 7,162 |  |  | 50,096 |  |  | 3,716 |  |  | 40,232 |
Total regulatory assets | $ | 38,785 |  |  | $ | 630,451 |  |  | $ | 48,552 |  |  | $ | 614,354 |
Regulatory Liabilities |  |  |  |  |  |  |
Income tax related liabilities | $ | 23,079 |  |  | $ | 418,039 |  |  | $ | 27,997 |  |  | $ | 425,613 |
Deferred natural gas costs | 1,852 |  |  | — |  |  | 40,713 |  |  | — |
Deferral power costs | 6,612 |  |  | 32,617 |  |  | 25,072 |  |  | 16,933 |
Decoupling rebate | 437 |  |  | 2,861 |  |  | 6,782 |  |  | 204 |
Utility plant retirement costs | — |  |  | 302,734 |  |  | — |  |  | 297,379 |
Interest rate swaps | — |  |  | 17,659 |  |  | — |  |  | 28,078 |
Other regulatory liabilities | 5,974 |  |  | 15,745 |  |  | 12,645 |  |  | 12,494 |
Total regulatory liabilities | $ | 37,954 |  |  | $ | 789,655 |  |  | $ | 113,209 |  |  | $ | 780,701 |

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