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Regulatory assets and liabilities (Tables) | 6 Months Ended
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Jun. 30, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets | The following table summarizes the individual components of unamortized regulatory assets and liabilities:
| Estimated Recovery or Refund Period as of June 30, 2021 | * | June 30, 2021 | June 30, 2020 | December 31, 2020 |  |
|  |  | (In thousands)
Regulatory assets: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 85,045 |  | $ | 42,582 |  | $ | 42,481 |  |  |
Conservation programs | Up to 1 year |  | 7,580 |  | 7,256 |  | 7,117 |  |  |
Cost recovery mechanisms | Up to 1 year |  | 5,692 |  | 7,781 |  | 10,645 |  |  |
Other | Up to 1 year |  | 11,264 |  | 2,938 |  | 8,284 |  |  |
|  |  | 109,581 |  | 60,557 |  | 68,527 |  |  |
Noncurrent: |  |  |  |  |  |  |
Pension and postretirement benefits | ** |  | 155,906 |  | 157,033 |  | 155,942 |  |  |
Plant costs/asset retirement obligations | Over plant lives |  | 72,853 |  | 68,191 |  | 71,740 |  |  |
Plant retirement | - |  | 46,061 |  | 49,185 |  | 65,919 |  |  |
Cost recovery mechanisms | Up to 10 years |  | 44,415 |  | 13,140 |  | 16,245 |  |  |
Manufactured gas plant site remediation | - |  | 26,155 |  | 14,826 |  | 26,429 |  |  |
Taxes recoverable from customers | Over plant lives |  | 10,929 |  | 10,890 |  | 10,785 |  |  |
Natural gas costs recoverable through rate adjustments | Up to 3 years |  | 8,389 |  | 27,184 |  | 21,539 |  |  |
Long-term debt refinancing costs | Up to 39 years |  | 4,110 |  | 3,980 |  | 4,426 |  |  |
Other | Up to 18 years |  | 8,095 |  | 6,596 |  | 6,356 |  |  |
|  |  | 376,913 |  | 351,025 |  | 379,381 |  |  |
Total regulatory assets |  |  | $ | 486,494 |  | $ | 411,582 |  | $ | 447,908 |  |  |
Regulatory liabilities: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | $ | 8,935 |  | $ | 29,557 |  | $ | 18,565 |  |  |
Electric fuel and purchased power deferral | Up to 1 year |  | 5,431 |  | 7,799 |  | 3,667 |  |  |
Taxes refundable to customers | Up to 1 year |  | 3,434 |  | 4,012 |  | 3,557 |  |  |
Other | Up to 1 year |  | 5,654 |  | 6,632 |  | 5,661 |  |  |
|  |  | 23,454 |  | 48,000 |  | 31,450 |  |  |
Noncurrent: |  |  |  |  |  |  |
Taxes refundable to customers | Over plant lives |  | 222,098 |  | 236,142 |  | 227,850 |  |  |
Plant removal and decommissioning costs | Over plant lives |  | 171,381 |  | 173,399 |  | 167,171 |  |  |
Pension and postretirement benefits | ** |  | 16,940 |  | 18,015 |  | 16,989 |  |  |
Other | Up to 21 years |  | 18,048 |  | 11,096 |  | 16,065 |  |  |
|  |  | 428,467 |  | 438,652 |  | 428,075 |  |  |
Total regulatory liabilities |  |  | $ | 451,921 |  | $ | 486,652 |  | $ | 459,525 |  |  |
Net regulatory position |  |  | $ | 34,573 |  | $ | (75,070) |  | $ | (11,617) |  |  |
Regulatory Liabilities | The following table summarizes the individual components of unamortized regulatory assets and liabilities:
| Estimated Recovery or Refund Period as of June 30, 2021 | * | June 30, 2021 | June 30, 2020 | December 31, 2020 |  |
|  |  | (In thousands)
Regulatory assets: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 85,045 |  | $ | 42,582 |  | $ | 42,481 |  |  |
Conservation programs | Up to 1 year |  | 7,580 |  | 7,256 |  | 7,117 |  |  |
Cost recovery mechanisms | Up to 1 year |  | 5,692 |  | 7,781 |  | 10,645 |  |  |
Other | Up to 1 year |  | 11,264 |  | 2,938 |  | 8,284 |  |  |
|  |  | 109,581 |  | 60,557 |  | 68,527 |  |  |
Noncurrent: |  |  |  |  |  |  |
Pension and postretirement benefits | ** |  | 155,906 |  | 157,033 |  | 155,942 |  |  |
Plant costs/asset retirement obligations | Over plant lives |  | 72,853 |  | 68,191 |  | 71,740 |  |  |
Plant retirement | - |  | 46,061 |  | 49,185 |  | 65,919 |  |  |
Cost recovery mechanisms | Up to 10 years |  | 44,415 |  | 13,140 |  | 16,245 |  |  |
Manufactured gas plant site remediation | - |  | 26,155 |  | 14,826 |  | 26,429 |  |  |
Taxes recoverable from customers | Over plant lives |  | 10,929 |  | 10,890 |  | 10,785 |  |  |
Natural gas costs recoverable through rate adjustments | Up to 3 years |  | 8,389 |  | 27,184 |  | 21,539 |  |  |
Long-term debt refinancing costs | Up to 39 years |  | 4,110 |  | 3,980 |  | 4,426 |  |  |
Other | Up to 18 years |  | 8,095 |  | 6,596 |  | 6,356 |  |  |
|  |  | 376,913 |  | 351,025 |  | 379,381 |  |  |
Total regulatory assets |  |  | $ | 486,494 |  | $ | 411,582 |  | $ | 447,908 |  |  |
Regulatory liabilities: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs refundable through rate adjustments | Up to 1 year |  | $ | 8,935 |  | $ | 29,557 |  | $ | 18,565 |  |  |
Electric fuel and purchased power deferral | Up to 1 year |  | 5,431 |  | 7,799 |  | 3,667 |  |  |
Taxes refundable to customers | Up to 1 year |  | 3,434 |  | 4,012 |  | 3,557 |  |  |
Other | Up to 1 year |  | 5,654 |  | 6,632 |  | 5,661 |  |  |
|  |  | 23,454 |  | 48,000 |  | 31,450 |  |  |
Noncurrent: |  |  |  |  |  |  |
Taxes refundable to customers | Over plant lives |  | 222,098 |  | 236,142 |  | 227,850 |  |  |
Plant removal and decommissioning costs | Over plant lives |  | 171,381 |  | 173,399 |  | 167,171 |  |  |
Pension and postretirement benefits | ** |  | 16,940 |  | 18,015 |  | 16,989 |  |  |
Other | Up to 21 years |  | 18,048 |  | 11,096 |  | 16,065 |  |  |
|  |  | 428,467 |  | 438,652 |  | 428,075 |  |  |
Total regulatory liabilities |  |  | $ | 451,921 |  | $ | 486,652 |  | $ | 459,525 |  |  |
Net regulatory position |  |  | $ | 34,573 |  | $ | (75,070) |  | $ | (11,617) |  |  |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
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