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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
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 (in thousands):
| Location on the Condensed Consolidated Statements of Income | Amount Reclassified from AOCI
Three Months Ended September 30, |  | Nine Months Ended September 30,
2020 | 2019 |  | 2020 | 2019
Gains and (losses) on cash flow hedges: |  |  |  |  |  |
Interest rate swaps | Interest expense | $ | (712) |  | $ | (713) |  |  | $ | (2,138) |  | $ | (2,139) |
Commodity contracts | Fuel, purchased power and cost of natural gas sold | (178) |  | (129) |  |  | (734) |  | 508 |
|  | (890) |  | (842) |  |  | (2,872) |  | (1,631) |
Income tax | Income tax benefit (expense) | 209 |  | 170 |  |  | 680 |  | 358 |
Total reclassification adjustments related to cash flow hedges, net of tax |  | $ | (681) |  | $ | (672) |  |  | $ | (2,192) |  | $ | (1,273) |
Amortization of components of defined benefit plans: |  |  |  |  |  |
Prior service cost | Operations and maintenance | $ | 24 |  | $ | 19 |  |  | $ | 79 |  | $ | 58 |
Actuarial gain (loss) | Operations and maintenance | (597) |  | (83) |  |  | (1,791) |  | (524) |
|  | (573) |  | (64) |  |  | (1,712) |  | (466) |
Income tax | Income tax benefit (expense) | 143 |  | 89 |  |  | 407 |  | 184 |
Total reclassification adjustments related to defined benefit plans, net of tax |  | $ | (430) |  | $ | 25 |  |  | $ | (1,305) |  | $ | (282) |
Total reclassifications |  | $ | (1,111) |  | $ | (647) |  |  | $ | (3,497) |  | $ | (1,555) |
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):
| 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 | — |  | 181 |  | 55 |  | 236 |
Amounts reclassified from AOCI | 1,630 |  | 562 |  | 1,305 |  | 3,497 |
As of September 30, 2020 | $ | (13,492) |  | $ | 287 |  | $ | (13,717) |  | $ | (26,922) |
| Interest Rate Swaps | Commodity Derivatives | Employee Benefit Plans | Total
As of December 31, 2018 | $ | (17,307) |  | $ | 328 |  | $ | (9,937) |  | $ | (26,916) |
Other comprehensive income (loss) |  |  |  |
before reclassifications | — |  | (334) |  | — |  | (334) |
Amounts reclassified from AOCI | 1,639 |  | (366) |  | 282 |  | 1,555 |
As of September 30, 2019 | $ | (15,668) |  | $ | (372) |  | $ | (9,655) |  | $ | (25,695) |

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