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Accumulated Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2022
Accumulated Other Comprehensive Income [Abstract] |
Accumulated Other Comprehensive Income | 12. Accumulated Other Comprehensive Income Changes in Accumulated Other Comprehensive Income by Component (in thousands)
|  | Foreign Currency Translation |  |  | Unrecognized Postretirement Benefit Costs (Credit) |  |  | Unrealized derivative gains (losses) |  |  | Total |
Balance at December 31, 2020 attributable to SMP |  | $ | (5,744 | ) |  | $ | 68 |  |  | $ | — |  |  | $ | (5,676 | )
Other comprehensive income before reclassifications |  |  | (2,477 | ) |  |  | — |  |  |  | — |  |  |  | (2,477 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (16 | ) |  |  | — |  |  |  | (16 | )
Other comprehensive income, net |  |  | (2,477 | ) |  |  | (16 | ) |  |  | — |  |  |  | (2,493 | )
Balance at December 31, 2021 attributable to SMP |  | $ | (8,221 | ) |  | $ | 52 |  |  | $ | — |  |  | $ | (8,169 | )
Other comprehensive income before reclassifications |  |  | (8,109 | ) |  |  | — |  |  |  | 3,797 | (1) |  |  | (4,312 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (15 | ) |  |  | 26 |  |  |  | 11 |
Other comprehensive income, net |  |  | (8,109 | ) |  |  | (15 | ) |  |  | 3,823 |  |  |  | (4,301 | )
Balance at December 31, 2022 attributable to SMP |  | $ | (16,330 | ) |  | $ | 37 |  |  | $ | 3,823 |  |  | $ | (12,470 | )
| (1) | Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $5.2 million ($3.8 million, net of tax), net of cash settlements payments of $42,000 ($31,000, net of tax) in the year ended December 31, 2022.
Reclassifications Out of Accumulated Other Comprehensive Income (in thousands):
|  | Year Ended December 31, |
Details About Accumulated Other Comprehensive Income Components |  | 2022 |  |  | 2021 |
Derivative cash flow hedge: |  |  |  |  |  |
Unrecognized gain (loss) (1) |  | $ | 35 |  |  | $ | — |
Postretirement Benefit Plans: |  |  |  |  |  |  |  |
Unrecognized gain (loss) (2) |  |  | (25 | ) |  |  | (27 | )
Total before income tax |  |  | 10 |  |  |  | (27 | )
Income tax expense (benefit) |  |  | (1 | ) |  |  | (11 | )
Total reclassifications attributable to SMP |  | $ | 11 |  |  | $ | (16 | )
| (1) | 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.
| (2) | 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 15, “Employee Benefits,” for additional information).

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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 https://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 https://asc.fasb.org/extlink&oid=126953954&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 https://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 https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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