CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 28,485	$ 21,150
Accounts receivable, less allowances for discounts and expected credit losses of $5,872 and $5,375 for 2023 and 2022, respectively	208,053	167,638
Inventories	479,788	528,715
Unreturned customer inventories	21,847	19,695
Prepaid expenses and other current assets	24,240	25,241
Total current assets	762,413	762,439
Property, plant and equipment, net of accumulated depreciation of $252,614 and $239,176 for 2023 and 2022, respectively	113,012	107,148
Operating lease right-of-use assets	99,067	49,838
Goodwill	134,382	132,087
Other intangibles, net	94,324	100,504
Deferred income taxes	36,455	33,658
Investments in unconsolidated affiliates	22,909	41,745
Other assets	37,368	27,510
Total assets	1,299,930	1,254,929
CURRENT LIABILITIES:
Current portion of revolving credit facility	47,400	50,000
Current portion of term loan and other debt	5,026	5,031
Accounts payable	103,237	89,247
Sundry payables and accrued expenses	71,298	49,990
Accrued customer returns	48,556	37,169
Accrued core liability	19,778	22,952
Accrued rebates	46,329	37,381
Payroll and commissions	31,718	31,361
Total current liabilities	373,342	323,131
Long-term debt	95,170	184,589
Noncurrent operating lease liabilities	88,186	40,709
Other accrued liabilities	23,797	22,157
Accrued asbestos liabilities	73,962	63,305
Total liabilities	654,457	633,891
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	108,058	105,615
Retained earnings	573,110	564,242
Accumulated other comprehensive income	(10,219)	(12,470)
Treasury stock - at cost (2,208,069 shares and 2,350,377 shares in 2023 and 2022, respectively)	(89,473)	(95,239)
Total SMP stockholders' equity	629,348	610,020
Noncontrolling interest	16,125	11,018
Total stockholders' equity	645,473	621,038
Total liabilities and stockholders' equity	$ 1,299,930	$ 1,254,929