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Balance Sheet Components Balance Sheet Components (Notes) | 9 Months Ended
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Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Supplemental Balance Sheet Disclosures [Text Block] | BALANCE SHEET COMPONENTS 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 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 |
Other Current Assets 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 |
Net Utility Property 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 |
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, 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 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 Non-Current Liabilities and Deferred Credits 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 |
Regulatory Assets and Liabilities 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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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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