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Balance Sheet Components Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2019
Balance Sheet Components [Abstract] |
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 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 |
Schedule of Other Current Assets [Table Text Block] | 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 |
Schedule of Other Assets, Noncurrent [Table Text Block] | 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 [Table Text Block] | 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 Noncurrent Liabilities [Table Text Block] | 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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