CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 23,019	$ 21,150
Accounts receivable, less allowances for discounts and expected credit losses of $5,757 and $5,375 for 2023 and 2022, respectively	218,105	167,638
Inventories	499,134	528,715
Unreturned customer inventories	19,722	19,695
Prepaid expenses and other current assets	27,903	25,241
Total current assets	787,883	762,439
Property, plant and equipment, net of accumulated depreciation of $250,382 and $239,176 for 2023 and 2022, respectively	107,590	107,148
Operating lease right-of-use assets	73,093	49,838
Goodwill	132,391	132,087
Other intangibles, net	96,291	100,504
Deferred income taxes	33,905	33,658
Investments in unconsolidated affiliates	41,557	41,745
Other assets	29,435	27,510
Total assets	1,302,145	1,254,929
CURRENT LIABILITIES:
Current portion of revolving credit facility	53,700	50,000
Current portion of term loan and other debt	5,028	5,031
Accounts payable	94,657	89,247
Sundry payables and accrued expenses	59,126	49,990
Accrued customer returns	43,664	37,169
Accrued core liability	20,187	22,952
Accrued rebates	43,781	37,381
Payroll and commissions	28,346	31,361
Total current liabilities	348,489	323,131
Long-term debt	164,488	184,589
Noncurrent operating lease liabilities	64,271	40,709
Other accrued liabilities	24,917	22,157
Accrued asbestos liabilities	59,565	63,305
Total liabilities	661,730	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	106,529	105,615
Retained earnings	572,753	564,242
Accumulated other comprehensive income	(7,927)	(12,470)
Treasury stock - at cost (2,210,069 shares and 2,350,377 shares in 2023 and 2022, respectively)	(89,554)	(95,239)
Total SMP stockholders' equity	629,673	610,020
Noncontrolling interest	10,742	11,018
Total stockholders' equity	640,415	621,038
Total liabilities and stockholders' equity	$ 1,302,145	$ 1,254,929