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Other Comprehensive Income: | 3 Months Ended
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Mar. 31, 2021
Statement of Comprehensive Income [Abstract] |
Other Comprehensive Income | Other Comprehensive Income We record deferred gains (losses) in AOCI related to interest rate swaps designated as cash flow hedges, commodity contracts designated as cash flow hedges and the amortization of components of our defined benefit plans. Deferred gains (losses) for our commodity contracts designated as cash flow hedges are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate swaps are recognized in earnings as they are amortized. 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 March 31,
|  |  | 2021 | 2020
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 |  |  |  | (31) |  | (486) |
|  |  |  |  | (744) |  | (1,199) |
Income tax | Income tax benefit |  |  |  | 198 |  | 285 |
Total reclassification adjustments related to cash flow hedges, net of tax |  |  |  |  | $ | (546) |  | $ | (914) |
Amortization of components of defined benefit plans: |  |  |  |  |  |
Prior service cost | Operations and maintenance |  |  |  | $ | 25 |  | $ | 30 |
Actuarial gain (loss) | Operations and maintenance |  |  |  | (598) |  | (597) |
|  |  |  |  | (573) |  | (567) |
Income tax | Income tax benefit |  |  |  | 208 |  | 88 |
Total reclassification adjustments related to defined benefit plans, net of tax |  |  |  |  | $ | (365) |  | $ | (479) |
Total reclassifications |  |  |  |  | $ | (911) |  | $ | (1,393) |
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, 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) |
| 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 | — |  | (175) |  | 55 |  | (120) |
Amounts reclassified from AOCI | 543 |  | 371 |  | 479 |  | 1,393 |
As of March 31, 2020 | $ | (14,579) |  | $ | (260) |  | $ | (14,543) |  | $ | (29,382) |

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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