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Balance Sheet Components Balance Sheet Components (Policies) | 3 Months Ended
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Mar. 31, 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 March 31, 2019 and December 31, 2018 (dollars in thousands):
| March 31, |  | December 31,
| 2019 |  | 2018
Materials and supplies | $ | 47,705 |  |  | $ | 47,403 |
Fuel stock | 4,930 |  |  | 4,869 |
Stored natural gas | 8,719 |  |  | 11,609 |
Total | $ | 61,354 |  |  | $ | 63,881 |

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