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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2023
Accumulated Other Comprehensive Income [Abstract]  
Changes in Accumulated Other Comprehensive Income by Component
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, 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 )
Other comprehensive income before reclassifications
     7,433       —       831   (1)      8,264  
Amounts reclassified from accumulated other comprehensive income
     —       (13 )     (1,755 )       (1,768 )
Other comprehensive income, net
     7,433       (13 )     (924 )       6,496  
Balance at December 31, 2023 attributable to SMP
  
$
(8,897
)
  
$
24
    
$
2,899
      
$
(5,974
)

 
(1)
Consists of the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $1.2 million ($0.9 million, net of tax) plus cash settlement receipts of $2.4 million ($1.7 million, net of tax) in the year ended December 31, 2023; and 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) minus cash settlement payments of $42,000 ($31,000, net of tax) in the year December 31, 2022.
Reclassifications Out of Accumulated Other Comprehensive Income
Reclassifications Out of Accumulated Other Comprehensive Income (in thousands):

 
  
Year Ended December 31,
 
Details About Accumulated Other Comprehensive Income Components
  
2023
    
2022
  
Derivative cash flow hedge:
            
Unrecognized gain (loss) (1)
  
$
(2,372
)
  
$
35
  
Postretirement Benefit Plans:
                
Unrecognized gain (loss) (2)
    
(22
)
    
(25
)
Total before income tax
    
(2,394
)
    
10
  
Income tax expense (benefit)
    
(626
)
    
(1
)
Total reclassifications attributable to SMP
  
$
(1,768
)
  
$
11
  

 
(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).