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Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP |  |  | $ 601,580
Other comprehensive income before reclassifications |  | $ (6,460) | (7,101)
Amounts reclassified from accumulated other comprehensive income |  | 97 | 92
Other comprehensive income, net |  | (6,363) | (7,009)
Balance attributable to SMP |  | 601,586 | 601,586
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Unrecognized gain relating to change in fair value of cash flow interest rate hedge |  | 137 | 137
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax |  | 102 | 102
Unrecognized gain, net of cash settlements payments |  | 132 | 132
Unrecognized gain, net of cash settlements payments, net of tax |  | 98 | 98
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP |  | (8,815) | (8,169)
Balance attributable to SMP |  | (15,178) | (15,178)
Foreign Currency Translation [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP |  | (8,862) | (8,221)
Other comprehensive income before reclassifications |  | (6,464) | (7,105)
Amounts reclassified from accumulated other comprehensive income |  | 0 | 0
Other comprehensive income, net |  | (6,464) | (7,105)
Balance attributable to SMP |  | (15,326) | (15,326)
Unrecognized Postretirement Benefit Costs (Credit) [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP |  | 47 | 52
Other comprehensive income before reclassifications |  | 0 | 0
Amounts reclassified from accumulated other comprehensive income |  | (4) | (9)
Other comprehensive income, net |  | (4) | (9)
Balance attributable to SMP |  | 43 | 43
Unrealized Derivative Gains (Losses) [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP |  | 0 | 0
Other comprehensive income before reclassifications | [1] | 4 | 4
Amounts reclassified from accumulated other comprehensive income |  | 101 | 101
Other comprehensive income, net |  | 105 | 105
Balance attributable to SMP |  | $ 105 | $ 105
[1] | Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $137,000 ($102,000, net of tax) in the three months and six months ended June 30, 2022, net of cash settlements payments of $132,000 ($98,000, net of tax) in the three months and six months ended June 30, 2022.

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