CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
CURRENT ASSETS:
Cash	$ 59,207	$ 72,031
Accounts receivable, less allowances for discounts and expected credit losses of $10,159 and $10,043 for 2026 and 2025, respectively	312,961	232,020
Inventories	726,308	727,922
Prepaid expenses and other current assets	21,069	18,477
Total current assets	1,119,545	1,050,450
Property, plant and equipment, net of accumulated depreciation of $299,761 and $300,283 for 2026 and 2025, respectively	186,442	188,562
Operating lease right-of-use assets	102,003	105,178
Goodwill	253,626	256,159
Customer relationships intangibles, net	204,526	212,056
Other intangibles, net	97,303	99,102
Deferred income taxes	25,599	25,384
Investments in unconsolidated affiliates	26,685	26,310
Other assets	32,570	32,040
Total assets	2,048,299	1,995,241
CURRENT LIABILITIES:
Current portion of revolving credit facility	30,000	30,000
Current portion of term loan and other debt	19,370	21,988
Accounts payable	179,524	169,089
Sundry payables and accrued expenses	98,246	92,054
Accrued customer returns	63,710	49,554
Accrued rebates	75,924	84,494
Payroll and commissions	34,298	46,135
Total current liabilities	501,072	493,314
Long-term debt	609,250	566,727
Noncurrent operating lease liabilities	90,345	93,381
Accrued asbestos liabilities	109,783	112,625
Other accrued liabilities	30,270	30,932
Total liabilities	1,340,720	1,296,979
Commitments and contingencies
Stockholders’ equity:
Common stock – par value $2.00 per share (Authorized – 30,000,000 shares; issued 23,936,036 shares)	47,872	47,872
Capital in excess of par value	101,104	99,005
Retained earnings	599,276	589,448
Accumulated other comprehensive income	11,664	17,857
Treasury stock – at cost (1,690,616 shares and 1,790,097 shares in 2026 and 2025, respectively)	(66,589)	(70,483)
Total SMP stockholders’ equity	693,327	683,699
Noncontrolling interest	14,252	14,563
Total stockholders’ equity	707,579	698,262
Total liabilities and stockholders’ equity	$ 2,048,299	$ 1,995,241