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Accumulated Other Comprehensive Income Attributable to SMP- Schedule of Accumulated Other Comprehensive by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 654,322 $ 640,415 $ 650,873 $ 621,038
Other comprehensive income, net of tax (80) (2,245) (3,583) 2,188
Ending balance 653,444 645,473 653,444 645,473
Unrealized loss on cash flow hedge, pretax 3,500   1,500  
Unrealized loss on cash flow hedge, net of tax 2,600   1,100  
Cash settlements payments, pretax 700   2,000  
Cash settlement payments, net of tax 500   1,500  
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (13,850)   (8,897)  
Other comprehensive income (loss) before reclassifications 2,443   (2,510)  
Amounts reclassified from accumulated other comprehensive income 0   0  
Other comprehensive income, net of tax 2,443   (2,510)  
Ending balance (11,407)   (11,407)  
Cash Flow Hedge        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 4,369   2,899  
Other comprehensive income (loss) before reclassifications (2,055)   406  
Amounts reclassified from accumulated other comprehensive income (497)   (1,488)  
Other comprehensive income, net of tax (2,552)   (1,082)  
Ending balance 1,817   1,817  
Postretirement Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 19   24  
Other comprehensive income (loss) before reclassifications 0   0  
Amounts reclassified from accumulated other comprehensive income (3)   (8)  
Other comprehensive income, net of tax (3)   (8)  
Ending balance 16   16  
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (9,462) (7,927) (5,974) (12,470)
Other comprehensive income (loss) before reclassifications 388   (2,104)  
Amounts reclassified from accumulated other comprehensive income (500)   (1,496)  
Other comprehensive income, net of tax (112) (2,292) (3,600) 2,251
Ending balance $ (9,574) $ (10,219) $ (9,574) $ (10,219)