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Balance Sheet Components Balance Sheet Components (Policies) | 9 Months Ended
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Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Inventory, Policy [Policy 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 |

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