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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2022
Statement of Comprehensive Income [Abstract] |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | The following table details reclassifications out of AOCI and into Net income. The amounts in parentheses below indicate decreases to Net income in the Condensed Consolidated Statements of Income for the period, net of tax (in thousands):
| Location on the Condensed Consolidated Statements of Income |  |  |  | Amount Reclassified from AOCI
|  | Three Months Ended March 31,
|  |  | 2022 | 2021
Gains and (losses) on cash flow hedges: |  |  |  |  |  |
Interest rate swaps | Interest expense |  |  |  | $ | (713) |  | $ | (713) |
Commodity contracts | Fuel, purchased power and cost of natural gas sold |  |  |  | 2,254 |  | (31) |
|  |  |  |  | 1,541 |  | (744) |
Income tax | Income tax expense |  |  |  | (375) |  | 198 |
Total reclassification adjustments related to cash flow hedges, net of tax |  |  |  |  | $ | 1,166 |  | $ | (546) |
Amortization of components of defined benefit plans: |  |  |  |  |  |
Prior service cost | Operations and maintenance |  |  |  | $ | 24 |  | $ | 25 |
Actuarial gain (loss) | Operations and maintenance |  |  |  | (188) |  | (598) |
|  |  |  |  | (164) |  | (573) |
Income tax | Income tax expense |  |  |  | 39 |  | 208 |
Total reclassification adjustments related to defined benefit plans, net of tax |  |  |  |  | $ | (125) |  | $ | (365) |
Total reclassifications |  |  |  |  | $ | 1,041 |  | $ | (911) |
Schedule of Accumulated Other Comprehensive Income (Loss) | Balances by classification included within AOCI, net of tax on the accompanying Condensed 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, 2021 | $ | (10,384) |  | $ | 1,476 |  | $ | (11,176) |  | $ | (20,084) |
Other comprehensive income (loss) |  |  |  |
before reclassifications | — |  | 1,047 |  | — |  | 1,047 |
Amounts reclassified from AOCI | 536 |  | (1,702) |  | 125 |  | (1,041) |
As of March 31, 2022 | $ | (9,848) |  | $ | 821 |  | $ | (11,051) |  | $ | (20,078) |
| 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 | — |  | 107 |  | — |  | 107 |
Amounts reclassified from AOCI | 523 |  | 23 |  | 365 |  | 911 |
As of March 31, 2021 | $ | (12,035) |  | $ | 132 |  | $ | (14,425) |  | $ | (26,328) |

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