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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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