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Accumulated Other Comprehensive Income Attributable to SMP (Tables) | 6 Months Ended
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Jun. 30, 2024
Accumulated Other Comprehensive Income Attributable to SMP [Abstract] |
Changes in Accumulated Other Comprehensive Income by Component | Changes in Accumulated Other Comprehensive Income by Component (in thousands)
|  | Three Months Ended June 30, 2024 |
|  | Foreign Currency Translation |  |  | Unrealized derivative gains (losses) |  |  | Unrecognized Postretirement Benefit Costs (Credit) |  |  | Total |
Balance at March 31, 2024 |  | $ | (10,117 | ) |  | $ | 4,290 |  |  | $ | 21 |  |  | $ | (5,806 | )
Other comprehensive income (loss) before reclassifications |  |  | (3,733 | ) |  |  | 573 | (a) |  |  | — |  |  |  | (3,160 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (494 | ) |  |  | (2 | ) |  |  | (496 | )
Other comprehensive income (loss), net |  |  | (3,733 | ) |  |  | 79 |  |  |  | (2 | ) |  |  | (3,656 | )
Balance at June 30, 2024 |  | $ | (13,850 | ) |  | $ | 4,369 |  |  | $ | 19 |  |  | $ | (9,462 | )
|  | Six Months Ended June 30, 2024 |
|  | Foreign Currency Translation |  |  | Unrealized derivative gains (losses) |  |  | Unrecognized Postretirement Benefit Costs (Credit) |  |  | Total |
Balance at December 31, 2023 |  | $ | (8,897 | ) |  | $ | 2,899 |  |  | $ | 24 |  |  | $ | (5,974 | )
Other comprehensive income (loss) before reclassifications |  |  | (4,953 | ) |  |  | 2,461 | (a) |  |  | — |  |  |  | (2,492 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (991 | ) |  |  | (5 | ) |  |  | (996 | )
Other comprehensive income (loss), net |  |  | (4,953 | ) |  |  | 1,470 |  |  |  | (5 | ) |  |  | (3,488 | )
Balance at June 30, 2024 |  | $ | (13,850 | ) |  | $ | 4,369 |  |  | $ | 19 |  |  | $ | (9,462 | )
| (a) | Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $0.1 million ($0.1 million, net of tax) and $2 million ($1.5 million, net of tax) in the three and six months ended June 30, 2024, respectively, and cash settlement receipts of $0.7 million ($0.5 million, net of tax) and $1.3 million ($1 million, net of tax) in the three and six months ended June 30, 2024, respectively.
Reclassifications Out of Accumulated Other Comprehensive Income | Reclassifications Out of Accumulated Other Comprehensive Income (in thousands)
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2024 |  |  | June 30, 2024 |
Derivative cash flow hedge: |  |  |  |  |  |
Unrecognized loss (a) |  | $ | (668 | ) |  | $ | (1,339 | )
Postretirement benefit plans: |  |  |  |  |  |  |  |
Unrecognized loss (b) |  |  | (4 | ) |  |  | (9 | )
Total before income tax |  |  | (672 | ) |  |  | (1,348 | )
Income tax benefit |  |  | (176 | ) |  |  | (352 | )
Total reclassifications attributable to SMP |  | $ | (496 | ) |  | $ | (996 | )
| (a) | Unrecognized accumulated other comprehensive income (loss) related to the cash flow interest rate hedge is reclassified to earnings and reported as part of interest expense in our consolidated statements of operations when the interest payments on the underlying borrowings are recognized.
| (b) | Unrecognized accumulated other comprehensive income (loss) related to our postretirement benefit plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations (see Note 12, “Employee Benefits,” for additional information).

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