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Balance Sheet Components Balance Sheet Components (Tables) | 9 Months Ended
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Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Schedule of Other Current Assets [Table Text Block] | Other current assets consisted of the following as of September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities | $ | 1,400 |  |  | $ | 26,809 |
Prepayments | 19,377 |  |  | 17,536 |
Other | 16,216 |  |  | 9,665 |
Total | $ | 36,993 |  |  | $ | 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 September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Materials and supplies | $ | 46,721 |  |  | $ | 47,403 |
Fuel stock | 5,522 |  |  | 4,869 |
Stored natural gas | 15,489 |  |  | 11,609 |
Total | $ | 67,732 |  |  | $ | 63,881 |
Public Utility Property, Plant, and Equipment [Table Text Block] | Net utility property consisted of the following as of September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Utility plant in service | $ | 6,335,663 |  |  | $ | 6,209,968 |
Construction work in progress | 185,167 |  |  | 160,598 |
Total | 6,520,830 |  |  | 6,370,566 |
Less: Accumulated depreciation and amortization | 1,793,816 |  |  | 1,721,636 |
Total net utility property | $ | 4,727,014 |  |  | $ | 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 September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Operating lease ROU assets | $ | 70,140 |  |  | $ | — |
Finance lease ROU assets | 51,890 |  |  | — |
Non-utility property | 27,151 |  |  | 31,355 |
Equity investments | 41,609 |  |  | 29,257 |
Investment in affiliated trust | 11,547 |  |  | 11,547 |
Notes receivable | 15,751 |  |  | 11,073 |
Deferred compensation assets | 8,852 |  |  | 8,400 |
Other | 21,943 |  |  | 23,065 |
Total | $ | 248,883 |  |  | $ | 114,697 |
Other Current Liabilities [Table Text Block] | Other current liabilities consisted of the following as of September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Accrued taxes other than income taxes | $ | 35,618 |  |  | $ | 36,858 |
Employee paid time off accruals | 21,693 |  |  | 20,992 |
Accrued interest | 30,157 |  |  | 16,704 |
Current portion of pensions and other postretirement benefits | 8,826 |  |  | 9,151 |
Derivative liabilities | 3,109 |  |  | 3,908 |
Other current liabilities | 30,686 |  |  | 32,745 |
Total other current liabilities | $ | 130,089 |  |  | $ | 120,358 |
Other Noncurrent Liabilities [Table Text Block] | Other non-current liabilities and deferred credits consisted of the following as of September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Operating lease liabilities | $ | 68,925 |  |  | $ | — |
Finance lease liabilities | 52,450 |  |  | — |
Deferred investment tax credits | 30,639 |  |  | 29,725 |
Asset retirement obligations | 18,071 |  |  | 18,266 |
Derivative liabilities | 46,050 |  |  | 10,300 |
Other | 13,204 |  |  | 12,740 |
Total | $ | 229,339 |  |  | $ | 71,031 |
Schedule Of Regulated Asset And Liability [Table Text Block] | Regulatory assets and liabilities consisted of the following as of September 30, 2019 and December 31, 2018 (dollars in thousands):
| September 30, 2019 |  | December 31, 2018
| Current |  | Non-Current |  | Current |  | Non-Current
Regulatory Assets |  |  |  |  |  |  |
Energy commodity derivatives | $ | 6,374 |  |  | $ | 1,018 |  |  | $ | 41,428 |  |  | $ | 16,866 |
Decoupling surcharge | 10,266 |  |  | 18,395 |  |  | 3,408 |  |  | 17,501 |
Pension and other postretirement benefit plans | — |  |  | 218,006 |  |  | — |  |  | 228,062 |
Interest rate swaps | — |  |  | 189,872 |  |  | — |  |  | 133,854 |
Deferred income taxes | — |  |  | 93,818 |  |  | — |  |  | 91,188 |
Settlement with Coeur d'Alene Tribe | — |  |  | 41,660 |  |  | — |  |  | 42,643 |
AFUDC above FERC allowed rate (1) | — |  |  | 37,239 |  |  | — |  |  | 1,814 |
Demand side management programs | — |  |  | 11,701 |  |  | — |  |  | 19,674 |
Utility plant to be abandoned | — |  |  | 25,849 |  |  | — |  |  | 24,334 |
Other regulatory assets | 3,250 |  |  | 51,256 |  |  | 3,716 |  |  | 38,418 |
Total regulatory assets | $ | 19,890 |  |  | $ | 688,814 |  |  | $ | 48,552 |  |  | $ | 614,354 |
Regulatory Liabilities |  |  |  |  |  |  |
Income tax related liabilities | $ | 23,409 |  |  | $ | 414,857 |  |  | $ | 27,997 |  |  | $ | 425,613 |
Deferred natural gas costs | 3,762 |  |  | — |  |  | 40,713 |  |  | — |
Deferral power costs | 7,711 |  |  | 29,618 |  |  | 25,072 |  |  | 16,933 |
Decoupling rebate | 99 |  |  | 3,098 |  |  | 6,782 |  |  | 204 |
Utility plant retirement costs | — |  |  | 307,923 |  |  | — |  |  | 297,379 |
Interest rate swaps | — |  |  | 16,863 |  |  | — |  |  | 28,078 |
Other regulatory liabilities | 8,461 |  |  | 13,772 |  |  | 12,645 |  |  | 12,494 |
Total regulatory liabilities | $ | 43,442 |  |  | $ | 786,131 |  |  | $ | 113,209 |  |  | $ | 780,701 |
(1) See Note 1 for a description of a reclassification associated with this regulatory asset.

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