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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Statement of Comprehensive Income [Abstract] |
Reclassification out of Accumulated Other Comprehensive Income | The amounts in parentheses below indicate decreases to Net income in the Consolidated Statements of Income for the period, net of tax (in thousands):
| Location on the Consolidated Statements of Income | Amount Reclassified from AOCI
December 31, 2021 | December 31, 2020
Gains and (losses) on cash flow hedges: |  |  |
Interest rate swaps | Interest expense | $ | (2,851) |  | $ | (2,851) |
Commodity contracts | Fuel, purchased power and cost of natural gas sold | 2,051 |  | (601) |
|  | (800) |  | (3,452) |
Income tax | Income tax benefit (expense) | 175 |  | 383 |
Total reclassification adjustments related to cash flow hedges, net of tax |  | $ | (625) |  | $ | (3,069) |
Amortization of components of defined benefit plans: |  |  |
Prior service cost | Operations and maintenance | $ | 98 |  | $ | 103 |
Actuarial gain (loss) | Operations and maintenance | (2,391) |  | (2,387) |
|  | (2,293) |  | (2,284) |
Income tax | Income tax benefit (expense) | 638 |  | 935 |
Total reclassification adjustments related to defined benefit plans, net of tax |  | $ | (1,655) |  | $ | (1,349) |
Total reclassifications |  | $ | (2,280) |  | $ | (4,418) |
Schedule of Accumulated Other Comprehensive Income (Loss) | Balances by classification included within AOCI, net of tax on the accompanying Consolidated Balance Sheets were as follows (in thousands):
| Derivatives Designated as Cash Flow Hedges |  |
| Interest Rate Swaps | Commodity Derivatives | Employee Benefit Plans | Total
As of December 31, 2020 | $ | (12,558) |  | $ | 2 |  | $ | (14,790) |  | $ | (27,346) |
Other comprehensive income (loss) |  |  |  |
before reclassifications | — |  | 3,023 |  | 1,959 |  | 4,982 |
Amounts reclassified from AOCI | 2,174 |  | (1,549) |  | 1,655 |  | 2,280 |
As of December 31, 2021 | $ | (10,384) |  | $ | 1,476 |  | $ | (11,176) |  | $ | (20,084) |
| Derivatives Designated as Cash Flow Hedges |  |
| Interest Rate Swaps | Commodity Derivatives | Employee Benefit Plans | Total
As of December 31, 2019 | $ | (15,122) |  | $ | (456) |  | $ | (15,077) |  | $ | (30,655) |
Other comprehensive income (loss) |  |  |  |
before reclassifications | — |  | (47) |  | (1,062) |  | (1,109) |
Amounts reclassified from AOCI | 2,564 |  | 505 |  | 1,349 |  | 4,418 |
As of December 31, 2020 | $ | (12,558) |  | $ | 2 |  | $ | (14,790) |  | $ | (27,346) |

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