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Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP | $ 601,580,000 |  |
Other comprehensive income before reclassifications | (4,312,000) |  | $ (2,477,000)
Amounts reclassified from accumulated other comprehensive income | 11,000 |  | (16,000)
Other comprehensive income, net | (4,301,000) |  | (2,493,000)
Balance attributable to SMP | 610,020,000 |  | 601,580,000
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 | 5,200,000 |  |
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax | 3,800,000 |  |
Unrecognized gain, net of cash settlements payments | 42,000 |  |
Unrecognized gain, net of cash settlements payments, net of tax | 31,000 |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP | (8,169,000) |  | (5,676,000)
Balance attributable to SMP | (12,470,000) |  | (8,169,000)
Foreign Currency Translation [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP | (8,221,000) |  | (5,744,000)
Other comprehensive income before reclassifications | (8,109,000) |  | (2,477,000)
Amounts reclassified from accumulated other comprehensive income | 0 |  | 0
Other comprehensive income, net | (8,109,000) |  | (2,477,000)
Balance attributable to SMP | (16,330,000) |  | (8,221,000)
Unrecognized Postretirement Benefit Costs (Credit) [Member] |  |  |
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward] |  |  |
Balance attributable to SMP | 52,000 |  | 68,000
Other comprehensive income before reclassifications | 0 |  | 0
Amounts reclassified from accumulated other comprehensive income | (15,000) |  | (16,000)
Other comprehensive income, net | (15,000) |  | (16,000)
Balance attributable to SMP | 37,000 |  | 52,000
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 | 3,797,000 | [1] | 0
Amounts reclassified from accumulated other comprehensive income | 26,000 |  | 0
Other comprehensive income, net | 3,823,000 |  | 0
Balance attributable to SMP | $ 3,823,000 |  | $ 0
[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.

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