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Accumulated Other Comprehensive Income Attributable to SMP (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 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 |  |  | (1,220 | ) |  |  | 1,888 | (a) |  |  | – |  |  |  | 668 |
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (497 | ) |  |  | (3 | ) |  |  | (500 | )
Other comprehensive income (loss), net |  |  | (1,220 | ) |  |  | 1,391 |  |  |  | (3 | ) |  |  | 168 |
Balance at March 31, 2024 |  | $ | (10,117 | ) |  | $ | 4,290 |  |  | $ | 21 |  |  | $ | (5,806 | )
| (a) | Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $1.9 million ($1.4 million, net of tax), plus cash settlement receipts of $0.7 million ($0.5 million, net of tax) in the three months ended March 31, 2024.
Reclassifications Out of Accumulated Other Comprehensive Income | Reclassifications Out of Accumulated Other Comprehensive Income (in thousands)
|  | Three Months Ended |
|  | March 31, 2024 |
Derivative cash flow hedge: |  |  |
Unrecognized (gain) loss (a) |  | $ | (671 | )
Postretirement benefit plans: |  |  |  |
Unrecognized (gain) loss (b) |  |  | (5 | )
Total before income tax |  |  | (676 | )
Income tax (expense) benefit |  |  | (176 | )
Total reclassifications |  | $ | (500 | )
| (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 post retirement plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income (expense), net in our consolidated statements of operations (see Note 12, “Employee Benefits,” for additional information).

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