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Regulatory assets and liabilities (Tables) | 6 Months Ended
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Jun. 30, 2020
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets | The following table summarizes the individual components of unamortized regulatory assets and liabilities:
| Estimated Recovery Period as of June 30, 2020 | * | June 30, 2020 | June 30, 2019 | December 31, 2019 |  |
|  |  | (In thousands) |  |  |  |
Regulatory assets: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 42,582 |  | $ | 65,448 |  | $ | 42,823 |  |  |
Cost recovery mechanisms | Up to 1 year |  | 7,781 |  | 7,484 |  | 6,288 |  |  |
Conservation programs | Up to 1 year |  | 7,256 |  | 6,529 |  | 6,963 |  |  |
Other | Up to 1 year |  | 2,938 |  | 1,200 |  | 7,539 |  |  |
|  |  | 60,557 |  | 80,661 |  | 63,613 |  |  |
Noncurrent: |  |  |  |  |  |  |
Pension and postretirement benefits | ** |  | 157,033 |  | 165,861 |  | 157,069 |  |  |
Asset retirement obligations | Over plant lives |  | 68,191 |  | 64,215 |  | 66,000 |  |  |
Plant to be retired | - |  | 49,185 |  | 16,933 |  | 32,931 |  |  |
Natural gas costs recoverable through rate adjustments | Up to 3 years |  | 27,184 |  | 29,095 |  | 46,381 |  |  |
Manufactured gas plant site remediation | - |  | 14,826 |  | 15,387 |  | 15,126 |  |  |
Cost recovery mechanisms | Up to 10 years |  | 13,140 |  | 11,004 |  | 13,108 |  |  |
Taxes recoverable from customers | Over plant lives |  | 10,890 |  | 11,755 |  | 11,486 |  |  |
Long-term debt refinancing costs | Up to 17 years |  | 3,980 |  | 4,592 |  | 4,286 |  |  |
Other | Up to 19 years |  | 6,596 |  | 8,322 |  | 7,397 |  |  |
|  |  | 351,025 |  | 327,164 |  | 353,784 |  |  |
Total regulatory assets |  |  | $ | 411,582 |  | $ | 407,825 |  | $ | 417,397 |  |  |
Regulatory liabilities: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs refundable through rate adjustments |  |  | $ | 29,557 |  | $ | 25,737 |  | $ | 23,825 |  |  |
Electric fuel and purchased power deferral |  |  | 7,799 |  | 4,686 |  | 5,824 |  |  |
Taxes refundable to customers |  |  | 4,012 |  | 7,104 |  | 3,472 |  |  |
Other |  |  | 6,632 |  | 12,447 |  | 9,814 |  |  |
|  |  | 48,000 |  | 49,974 |  | 42,935 |  |  |
Noncurrent: |  |  |  |  |  |  |
Taxes refundable to customers |  |  | 236,142 |  | 256,921 |  | 246,034 |  |  |
Plant removal and decommissioning costs |  |  | 173,399 |  | 173,661 |  | 173,722 |  |  |
Pension and postretirement benefits |  |  | 18,015 |  | 15,215 |  | 18,065 |  |  |
Other |  |  | 11,096 |  | 10,067 |  | 9,549 |  |  |
|  |  | 438,652 |  | 455,864 |  | 447,370 |  |  |
Total regulatory liabilities |  |  | $ | 486,652 |  | $ | 505,838 |  | $ | 490,305 |  |  |
Net regulatory position |  |  | $ | (75,070) |  | $ | (98,013) |  | $ | (72,908) |  |  |
*Estimated recovery period for regulatory assets currently being recovered in rates charged to customers. ** Recovered as expense is incurred or cash contributions are made.
Regulatory Liabilities | The following table summarizes the individual components of unamortized regulatory assets and liabilities:
| Estimated Recovery Period as of June 30, 2020 | * | June 30, 2020 | June 30, 2019 | December 31, 2019 |  |
|  |  | (In thousands) |  |  |  |
Regulatory assets: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs recoverable through rate adjustments | Up to 1 year |  | $ | 42,582 |  | $ | 65,448 |  | $ | 42,823 |  |  |
Cost recovery mechanisms | Up to 1 year |  | 7,781 |  | 7,484 |  | 6,288 |  |  |
Conservation programs | Up to 1 year |  | 7,256 |  | 6,529 |  | 6,963 |  |  |
Other | Up to 1 year |  | 2,938 |  | 1,200 |  | 7,539 |  |  |
|  |  | 60,557 |  | 80,661 |  | 63,613 |  |  |
Noncurrent: |  |  |  |  |  |  |
Pension and postretirement benefits | ** |  | 157,033 |  | 165,861 |  | 157,069 |  |  |
Asset retirement obligations | Over plant lives |  | 68,191 |  | 64,215 |  | 66,000 |  |  |
Plant to be retired | - |  | 49,185 |  | 16,933 |  | 32,931 |  |  |
Natural gas costs recoverable through rate adjustments | Up to 3 years |  | 27,184 |  | 29,095 |  | 46,381 |  |  |
Manufactured gas plant site remediation | - |  | 14,826 |  | 15,387 |  | 15,126 |  |  |
Cost recovery mechanisms | Up to 10 years |  | 13,140 |  | 11,004 |  | 13,108 |  |  |
Taxes recoverable from customers | Over plant lives |  | 10,890 |  | 11,755 |  | 11,486 |  |  |
Long-term debt refinancing costs | Up to 17 years |  | 3,980 |  | 4,592 |  | 4,286 |  |  |
Other | Up to 19 years |  | 6,596 |  | 8,322 |  | 7,397 |  |  |
|  |  | 351,025 |  | 327,164 |  | 353,784 |  |  |
Total regulatory assets |  |  | $ | 411,582 |  | $ | 407,825 |  | $ | 417,397 |  |  |
Regulatory liabilities: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Natural gas costs refundable through rate adjustments |  |  | $ | 29,557 |  | $ | 25,737 |  | $ | 23,825 |  |  |
Electric fuel and purchased power deferral |  |  | 7,799 |  | 4,686 |  | 5,824 |  |  |
Taxes refundable to customers |  |  | 4,012 |  | 7,104 |  | 3,472 |  |  |
Other |  |  | 6,632 |  | 12,447 |  | 9,814 |  |  |
|  |  | 48,000 |  | 49,974 |  | 42,935 |  |  |
Noncurrent: |  |  |  |  |  |  |
Taxes refundable to customers |  |  | 236,142 |  | 256,921 |  | 246,034 |  |  |
Plant removal and decommissioning costs |  |  | 173,399 |  | 173,661 |  | 173,722 |  |  |
Pension and postretirement benefits |  |  | 18,015 |  | 15,215 |  | 18,065 |  |  |
Other |  |  | 11,096 |  | 10,067 |  | 9,549 |  |  |
|  |  | 438,652 |  | 455,864 |  | 447,370 |  |  |
Total regulatory liabilities |  |  | $ | 486,652 |  | $ | 505,838 |  | $ | 490,305 |  |  |
Net regulatory position |  |  | $ | (75,070) |  | $ | (98,013) |  | $ | (72,908) |  |  |
*Estimated recovery period for regulatory assets currently being recovered in rates charged to customers. ** Recovered as expense is incurred or cash contributions are made.

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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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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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