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Balance Sheet Components Balance Sheet Components (Notes) | 12 Months Ended
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Dec. 31, 2019
Balance Sheet Components [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 December 31 (dollars in thousands):
| 2019 |  | 2018
Materials and supplies | $ | 47,402 |  |  | $ | 47,403 |
Fuel stock | 4,875 |  |  | 4,869 |
Stored natural gas | 14,306 |  |  | 11,609 |
Total | $ | 66,583 |  |  | $ | 63,881 |
Other Current Assets Other current assets consisted of the following as of December 31 (dollars in thousands):
| 2019 |  | 2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities | $ | 4,434 |  |  | $ | 26,809 |
Prepayments | 19,652 |  |  | 17,536 |
Income taxes receivable | 11,047 |  |  | 822 |
Other | 5,009 |  |  | 8,843 |
Total | $ | 40,142 |  |  | $ | 54,010 |
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 December 31 (dollars in thousands):
| 2019 |  | 2018
Operating lease ROU assets | $ | 69,746 |  |  | $ | — |
Finance lease ROU assets | 50,980 |  |  | — |
Non-utility property | 27,159 |  |  | 31,355 |
Equity investments | 51,258 |  |  | 29,257 |
Investment in affiliated trust | 11,547 |  |  | 11,547 |
Notes receivable | 14,060 |  |  | 11,073 |
Deferred compensation assets | 8,948 |  |  | 8,400 |
Other | 23,394 |  |  | 23,065 |
Total | $ | 257,092 |  |  | $ | 114,697 |
Other Current Liabilities Other current liabilities consisted of the following as of December 31 (dollars in thousands):
| 2019 |  | 2018
Accrued taxes other than income taxes | $ | 36,965 |  |  | $ | 36,858 |
Unsettled interest rate swap derivative liabilities | 7,825 |  |  | — |
Employee paid time off accruals | 22,343 |  |  | 20,992 |
Accrued interest | 16,486 |  |  | 16,704 |
Pensions and other postretirement benefits | 8,826 |  |  | 9,151 |
Utility energy commodity derivative liabilities | 3,103 |  |  | 3,908 |
Other | 35,431 |  |  | 32,745 |
Total | $ | 130,979 |  |  | $ | 120,358 |
Other Non-Current Liabilities and Deferred Credits Other non-current liabilities and deferred credits consisted of the following as of December 31 (dollars in thousands):
| 2019 |  | 2018
Operating lease liabilities | $ | 65,565 |  |  | $ | — |
Finance lease liabilities | 51,750 |  |  | — |
Deferred investment tax credits | 30,444 |  |  | 29,725 |
Asset retirement obligations | 20,338 |  |  | 18,266 |
Derivative liabilities | 19,685 |  |  | 10,300 |
Other | 13,407 |  |  | 12,740 |
Total | $ | 201,189 |  |  | $ | 71,031 |

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- Definition Balance Sheet Components [Abstract] + References No definition available. + Details
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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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