Standard Motor Products (SMP) 10-Q 1 May 24 2024 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	Apr. 29, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Document Transition Report	false
Entity File Number	001-04743
Entity Registrant Name	Standard Motor Products, Inc.
Entity Central Index Key	0000093389
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-1362020
Entity Address, Address Line One	37-18 Northern Blvd.
Entity Address, City or Town	Long Island City
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11101
City Area Code	718
Local Phone Number	392-0200
Title of 12(b) Security	Common Stock, par value $2.00 per share
Trading Symbol	SMP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		21,814,673

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	[1]	$ 331,403		$ 328,028
Cost of sales		241,881		236,761
Gross profit		89,522		91,267
Selling, general and administrative expenses		74,733		69,633
Restructuring and integration expenses		192	[2]	912
Other income, net		22		24
Operating income		14,619		20,746
Other non-operating income, net		819		225
Interest expense		2,067		3,862
Earnings from continuing operations before income taxes		13,371		17,109
Provision for income taxes		3,342		4,372
Earnings from continuing operations		10,029		12,737
Loss from discontinued operations, net of income taxes		(1,039)		(780)
Net earnings		8,990		11,957
Net earnings attributable to noncontrolling interest		166		39
Net earnings attributable to SMP	[3]	8,824		11,918
Net earnings attributable to SMP
Earnings from continuing operations		9,863		12,698
Discontinued operations		(1,039)		(780)
Net earnings attributable to SMP	[3]	$ 8,824		$ 11,918
Net earnings per common share - Basic:
Earnings from continuing operations (in dollars per share)		$ 0.45		$ 0.59
Discontinued operations (in dollars per share)		(0.05)		(0.04)
Net earnings per common share - Basic (in dollars per share)		0.4		0.55
Net earnings per common share - Diluted:
Earnings from continuing operations (in dollars per share)		0.44		0.57
Discontinued operations (in dollars per share)		(0.05)		(0.03)
Net earnings per common share - Diluted (in dollars per share)		0.39		0.54
Dividend declared per share (in dollars per share)		$ 0.29		$ 0.29
Average number of common shares (in shares)		21,923,830		21,609,618
Average number of common shares and dilutive common shares (in shares)		22,372,543		22,097,750
[1] There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments. Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$ 8,990	$ 11,957
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(1,224)	2,820
Derivative instruments	1,391	(1,377)
Pension and postretirement plans	(3)	(3)
Total other comprehensive income, net of tax	164	1,440
Total comprehensive income	9,154	13,397
Comprehensive income (loss) attributable to noncontrolling interest, net of tax:
Net earnings	166	39
Foreign currency translation adjustments	(4)	(29)
Comprehensive income attributable to noncontrolling interest, net of tax	162	10
Comprehensive income attributable to SMP	$ 8,992	$ 13,387

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 27,113	$ 32,526
Accounts receivable, less allowances for discounts and expected credit losses of $8,284 and $8,045 in 2024 and 2023, respectively	203,940	160,282
Inventories	520,702	507,075
Unreturned customer inventories	18,007	18,240
Prepaid expenses and other current assets	26,674	26,100
Total current assets	796,436	744,223
Property, plant and equipment, net of accumulated depreciation of $264,168 and $259,656 for 2024 and 2023, respectively	124,822	121,872
Operating lease right-of-use assets	102,060	100,065
Goodwill	134,624	134,729
Other intangibles, net	90,000	92,308
Deferred income taxes	40,241	40,533
Investments in unconsolidated affiliates	24,751	24,050
Other assets	38,627	35,267
Total assets	1,351,561	1,293,047
CURRENT LIABILITIES:
Current portion of term loan and other debt	5,030	5,029
Accounts payable	98,293	107,455
Sundry payables and accrued expenses	58,714	63,303
Accrued customer returns	47,220	38,238
Accrued core liability	17,438	18,399
Accrued rebates	45,191	42,278
Payroll and commissions	27,326	29,561
Total current liabilities	299,212	304,263
Long-term debt	209,872	151,182
Noncurrent operating lease liabilities	90,667	88,974
Other accrued liabilities	27,704	25,742
Accrued asbestos liabilities	68,985	72,013
Total liabilities	696,440	642,174
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	102,704	101,751
Retained earnings	575,658	573,226
Accumulated other comprehensive income	(5,806)	(5,974)
Treasury stock - at cost (2,022,276 shares and 2,018,892 shares in 2024 and 2023, respectively)	(81,278)	(81,811)
Total SMP stockholders' equity	639,150	635,064
Noncontrolling interest	15,971	15,809
Total stockholders' equity	655,121	650,873
Total liabilities and stockholders' equity	$ 1,351,561	$ 1,293,047

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
CURRENT ASSETS:
Accounts receivable, allowances for discounts and expected credit losses	$ 8,284	$ 8,045
Property, plant and equipment, accumulated depreciation	$ 264,168	$ 259,656
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 2	$ 2
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	23,936,036	23,936,036
Treasury stock - at cost (in shares)	2,022,276	2,018,892

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 8,990	$ 11,957
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	7,301	7,082
Amortization of deferred financing cost	120	124
Increase to allowance for expected credit losses	191	388
Increase to inventory reserves	1,068	962
Equity income from joint ventures	(694)	(154)
Employee Stock Ownership Plan allocation	697	742
Stock-based compensation	1,270	1,532
(Increase) decrease in deferred income taxes	(180)	213
Loss on discontinued operations, net of tax	1,039	780
Change in assets and liabilities:
Increase in accounts receivable	(43,978)	(42,617)
(Increase) decrease in inventories	(14,670)	6,195
Decrease in prepaid expenses and other current assets	1,649	1,165
Increase (decrease) in accounts payable	(9,274)	4,809
Increase (decrease) in sundry payables and accrued expenses	3,988	(10,656)
Net changes in other assets and liabilities	(3,233)	(2,964)
Net cash used in operating activities	(45,716)	(20,442)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(10,086)	(4,363)
Other investing activities	15	13
Net cash used in investing activities	(10,071)	(4,350)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of term loan	(1,250)	(1,250)
Net borrowings under revolving credit facilities	59,950	34,750
Net repayments of other debt and lease obligations	(8)	(22)
Purchase of treasury stock	(2,235)	0
Increase in overdraft balances	315	125
Dividends paid	(6,392)	(6,261)
Net cash provided by financing activities	50,380	27,342
Effect of exchange rate changes on cash	(6)	496
Net increase (decrease) in cash and cash equivalents	(5,413)	3,046
CASH AND CASH EQUIVALENTS at beginning of period	32,526	21,150
CASH AND CASH EQUIVALENTS at end of period	27,113	24,196
Cash paid during the period for:
Interest	2,241	3,970
Income taxes	$ 3,532	$ 3,163

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total SMP [Member]	Non-Controlling Interest [Member]	Total
Balance at beginning of period at Dec. 31, 2022	$ 47,872	$ 105,615	$ 564,242	$ (12,470)	$ (95,239)	$ 610,020	$ 11,018	$ 621,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0	0	11,918	0	0	11,918	39	11,957
Other comprehensive income (loss), net of tax	0	0	0	1,469	0	1,469	(29)	1,440
Cash dividends paid	0	0	(6,261)	0	0	(6,261)	0	(6,261)
Stock-based compensation	0	1,044	0	0	488	1,532	0	1,532
Employee Stock Ownership Plan	0	16	0	0	2,950	2,966	0	2,966
Balance at end of period at Mar. 31, 2023	47,872	106,675	569,899	(11,001)	(91,801)	621,644	11,028	632,672
Balance at beginning of period at Dec. 31, 2023	47,872	101,751	573,226	(5,974)	(81,811)	635,064	15,809	650,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0	0	8,824	0	0	8,824	166	8,990
Other comprehensive income (loss), net of tax	0	0	0	168	0	168	(4)	164
Cash dividends paid	0	0	(6,392)	0	0	(6,392)	0	(6,392)
Purchase of treasury stock	0	0	0	0	(2,571)	(2,571)	0	(2,571)
Stock-based compensation	0	950	0	0	320	1,270	0	1,270
Employee Stock Ownership Plan	0	3	0	0	2,784	2,787	0	2,787
Balance at end of period at Mar. 31, 2024	$ 47,872	$ 102,704	$ 575,658	$ (5,806)	$ (81,278)	$ 639,150	$ 15,971	$ 655,121

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Basis of Presentation [Abstract]
Basis of Presentation	Note 1. Basis of Presentation Standard Motor Products, Inc. and its subsidiaries (referred to hereinafter in these notes to the consolidated financial statements as “we,” “us,” “our,” “SMP,” or the “Company”) is a leading manufacturer and distributor of premium replacement parts in the automotive aftermarket, and a custom-engineered solutions provider to vehicle and equipment manufacturers in diverse non-aftermarket end markets. Our automotive aftermarket is comprised of two segments, Vehicle Control and Temperature Control, while our Engineered Solutions segment offers a broad array of conventional and future-oriented technologies in markets for commercial and light vehicles, construction, agriculture, power sports, marine, hydraulics and lawn and garden. We sell our products primarily to retailers, warehouse distributors, original equipment manufacturers and original equipment service part operations in the United States, Canada, Europe, Asia, Mexico and other Latin American countries. The accompanying unaudited financial information should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form -K for the year ended December The unaudited consolidated financial statements include our accounts and all domestic and international companies in which we have more than a equity ownership, except in instances where the minority shareholder maintains substantive participating rights, in which case we follow the equity method of accounting. In instances where we have more than a equity ownership and the minority shareholder does not maintain substantive participating rights, our consolidated financial statements include the accounts of the company on a consolidated basis with its net income and equity reported at amounts attributable to both our equity position and that of the noncontrolling interest. Investments in unconsolidated affiliates are accounted for on the equity method, as we do not have a controlling financial interest but have the ability to exercise significant influence. All significant inter-company items have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form -Q and Rule - of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for the interim periods are not necessarily indicative of the results of operations for the entire year. Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2024 presentation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies The preparation of consolidated annual and quarterly financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amount of assets and liabilities, the disclosure of contingent assets and liabilities at the date of our consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. We have made a number of estimates and assumptions in the preparation of these consolidated financial statements. We can give no assurance that actual results will not differ from those estimates. Although we do not believe that there is a reasonable likelihood that there will be a material change in the future estimates, or in the assumptions that we use in calculating the estimates, the uncertain future effects, if any, of disruptions in the supply chain caused by geo-political risks, future increases in interest rates, inflation, macroeconomic uncertainty, and other unforeseen changes in the industry, or business, could materially impact the estimates, and may have a material adverse effect on our business, financial condition and results of operations. Some of the more significant estimates include allowances for expected credit losses, cash discounts, valuation of inventory, valuation of long-lived assets, goodwill and other intangible assets, depreciation and amortization of long-lived assets, product liability exposures, asbestos, environmental and litigation matters, valuation of deferred tax assets, share based compensation and sales returns and other allowances. There have been no material changes to our critical accounting policies and estimates from the information provided in Note 1 of the notes to our consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2023. Recently Issued Accounting Pronouncements Standards not yet adopted as of March 31, 2024 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required effective income tax rate reconciliation disclosures to include (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, the ASU 2023-09 will expand required annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is December 31, 2025, with prospective application. Early adoption and retrospective application are permitted. The new standard will require expanding our annual income tax disclosures in our financial statements. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2025. We have reviewed all other recently issued accounting pronouncements and concluded they were either not applicable or not expected to have a material impact on the Company’s consolidated financial statements.

Business Acquisitions and Inves

Business Acquisitions and Investments	3 Months Ended
	Mar. 31, 2024
Business Acquisitions and Investments [Abstract]
Business Acquisitions and Investments	Note 3. Business Acquisitions and Investments 2023 Increase in Equity Investment Investment in Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. In April 2014, we formed Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (“Gwo Yng”), a 50/50 joint venture with Gwo Yng Enterprise Co., Ltd., a China-based manufacturer of air conditioner accumulators, filter driers, hose assemblies and switches. We acquired our 50% interest in the joint venture for approximately $14 million. In March 2018, we acquired an additional 15% equity interest in the joint venture for Chinese yuan renminbi 26,475,583 (approximately $4.2 million), thereby increasing our equity interest in the joint venture to 65%. While we increased our equity interest in the joint venture to 65%, the minority shareholder maintained substantive participating rights that allowed it to participate in certain significant financial and operating decisions that occur in the ordinary course of business. As a result, we continued to account for our investment in the joint venture under the equity method of accounting. In July 2023, we acquired an additional 15% equity interest in the joint venture for Chinese yuan renminbi 27,378,290 (approximately $4 million), thereby increasing our equity interest in Gwo Yng to 80%. In connection with the transaction, we amended and restated the charter documents of Gwo Yng to remove all minority shareholder substantive participating rights, giving SMP control of Gwo Yng. As a result, as of the closing date of the transaction, Gwo Yng was accounted for as a business combination achieved in stages (“a step acquisition”). Accordingly, commencing on the closing of the transaction, we reported the results of Gwo Yng on a consolidated basis with the minority ownership interest reported as a noncontrolling interest. The following table summarizes the allocation of the total step acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (a) $ 21,725 Assets acquired and liabilities assumed: Cash and cash equivalents $ 6,779 Receivables 5,912 Inventory 5,945 Other current assets 528 Property, plant and equipment, net 2,924 Operating lease right-of-use assets 4,372 Intangible assets (b) 532 Goodwill 2,208 Long term investments and other assets 7,257 Current liabilities (6,004 ) Noncurrent operating lease liabilities (3,455 ) Subtotal 26,998 Fair value of acquired noncontrolling interest (5,273 ) Total purchase consideration allocated to net assets acquired $ 21,725 (a) Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest. (b) Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million. Intangible assets of $0.4 million consisting of customer relationships is amortized on a straight-line basis over the estimated useful life of 10 years. Goodwill of $2.2 million was allocated to the Temperature Control and Engineered Solutions segments in the amounts of $1.2 million and $1 million, respectively. The goodwill reflects relationships, business specific knowledge and the replacement cost of an assembled workforce associated with personal reputations. Incremental revenues from Gwo Yng included in our consolidated statement of operations for the three months ended March 31, 2024 were not material.

Restructuring and Integration E

Restructuring and Integration Expenses	3 Months Ended
	Mar. 31, 2024
Restructuring and Integration Expenses [Abstract]
Restructuring and Integration Expenses	Note 4. Restructuring and Integration Expenses The aggregated liabilities included in “sundry payables and accrued expenses” and “other accrued liabilities” in the consolidated balance sheet relating to the restructuring and integration activities as of March 31, 2024 and December 31, 2023 and for the three months ended March 31, 2024, consisted of the following (in thousands): Workforce Reduction Other Exit Costs Total Exit activity liability at December 31, 2023 $ 1,729 $ — $ 1,729 Restructuring and integration costs: Amounts provided for during 2024 (a) 17 175 192 Cash payments (415 ) (175 ) (590 ) Foreign currency exchange rate changes (18 ) — (18 ) Exit activity liability at March 31, 2024 $ 1,313 $ — $ 1,313 (a) Restructuring and integration expenses incurred during the three months ended March 31, 2024 consist of $101,000 in our Vehicle Control segment, $58,000 in our Temperature Control segment and $33,000 in our Engineered Solutions segment. Restructuring Costs Cost Reduction Initiative During the fourth quarter of 2022, to further our ongoing efforts to improve operating efficiencies and reduce costs, we announced plans for a reduction in our sales force, and initiated plans to relocate certain product lines from our Independence, Kansas manufacturing facility and from our St. Thomas, Canada manufacturing facility to our manufacturing facilities in Reynosa, Mexico. Restructuring expenses related to the Cost Reduction Initiative of $192,000 were incurred during the three months ended March 31, 2024 consisting of (1) expenses of $17,000 of employee severance related to our product line relocations, and (2) expenses of $175,000 related to the relocation of machinery and equipment to our manufacturing facilities in Reynosa, Mexico. Cash payments made of $590,000 during the three months ended March 31, 2024 consisted primarily of severance payments related to the sales force reduction. the second quarter of 2024. Additional restructuring costs related to the initiative are expected to be immaterial.

Sale of Receivables

Sale of Receivables	3 Months Ended
	Mar. 31, 2024
Sale of Receivables [Abstract]
Sale of Receivables	Note 5. Sale of Receivables We are party to several supply chain financing arrangements, in which we may sell certain of our customers’ trade accounts receivable to such customers’ financial institutions. We sell our undivided interests in certain of these receivables at our discretion when we determine that the cost of these arrangements is less than the cost of servicing our receivables with existing debt. Under the terms of the agreements, we retain no rights or interest, have no obligations with respect to the sold receivables, and do not service the receivables after the sale. As such, these transactions are accounted for as a sale. Pursuant to these agreements, we sold $170.8 million and $170.9 million of receivables during the three months ended March 31, 2024 and 2023, March $10.9 million and $4.5 million, respectively, and March To the extent that these arrangements are terminated, our financial condition, results of operations, cash flows and liquidity could be adversely affected by extended payment terms, or delays or failures in collecting trade accounts receivable. The utility of the supply chain financing arrangements also depends upon a benchmark reference rate for the purpose of determining the discount rate applicable to each arrangement. If the benchmark reference rate increases significantly, we may be negatively impacted as we may not be able to pass these added costs on to our customers, which could have a material and adverse effect upon our financial condition, results of operations and cash flows.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2024
Inventories [Abstract]
Inventories	Note 6. Inventories Inventories, which are stated at the lower of cost (determined by means of the first-in, first-out method) and net realizable value, consist of the following: March 31, 2024 December 31, 2023 (In thousands) Finished goods $ 314,809 $ 302,557 Work in process 17,344 18,503 Raw materials 188,549 186,015 Subtotal 520,702 507,075 Unreturned customer inventories 18,007 18,240 Total inventories $ 538,709 $ 525,315

Acquired Intangible Assets

Acquired Intangible Assets	3 Months Ended
	Mar. 31, 2024
Acquired Intangible Assets [Abstract]
Acquired Intangible Assets	Note 7. Acquired Intangible Assets Acquired identifiable intangible assets consist of the following: March 31, 2024 December 31, 2023 (In thousands) Customer relationships $ 159,843 $ 159,641 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 8,880 8,880 Non-compete agreements 3,308 3,295 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets 187,114 186,899 Less: Accumulated amortization (a) (98,163 ) (95,681 ) Net acquired intangible assets $ 88,951 $ 91,218 (a) Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which has an indefinite useful life and, as such, is not being amortized. Total amortization expense for acquired intangible assets was $2.1 million and $2.2 million for the three months ended March 31, 2024 and 2023, respectively. Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $6.4 million for the remainder of 2024, $8.5 million in 2025, $8.5 million in 2026, $8.5 million in 2027 and $54.5 million in the aggregate for the years 2028 through 2041.

Leases

Leases	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Leases	Note 8. Leases We have operating and finance leases for our manufacturing facilities, warehouses, office space, automobiles, and certain equipment. Our leases have remaining lease terms of up to ten years, some of which may include one or more five-year renewal options. Leases with an initial term of twelve months or less are not recorded on the balance sheet. Operating lease expense is recognized on a straight-line basis over the lease term. Finance leases are not material. The following tables provide quantitative disclosures related to our operating leases and includes all operating leases acquired from the date of acquisition (in thousands): Balance Sheet Information March 31, 2024 December 31, 2023 Assets Operating lease right-of-use assets $ 102,060 $ 100,065 Liabilities Sundry payables and accrued expenses $ 17,973 $ 17,139 Noncurrent operating lease liabilities 90,667 88,974 Total operating lease liabilities $ 108,640 $ 106,113 Weighted Average Remaining Lease Term Operating leases 8.3 8.3 Weighted Average Discount Rate Operating leases 4.9% 4.8% Three Months Ended Expense and Cash Flow Information March 31, Lease Expense 2024 2023 Operating lease expense (a) $ 4,820 $ 3,109 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 4,131 $ 2,834 Right-of-use assets obtained in exchange for new operating lease obligations (b) $ 5,628 $ 29,092 (a) Excludes expenses of approximately $0.8 million for each of the three months ended March 31, 2024 and 2023, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material. (b) Includes $ 4.7 Minimum Lease Payments At March 31, 2024, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows (in thousands): 2024 $ 13,904 2025 16,624 2026 15,190 2027 14,245 2028 12,616 Thereafter 62,092 Total lease payments $ 134,671 Less: Interest (26,031 ) Present value of lease liabilities $ 108,640

Credit Facilities and Long-Term

Credit Facilities and Long-Term Debt	3 Months Ended
	Mar. 31, 2024
Credit Facilities and Long-Term Debt [Abstract]
Credit Facilities and Long-Term Debt	Note 9. Credit Facilities and Long-Term Debt Total debt outstanding is summarized as follows: March 31, 2024 December 31, 2023 (In thousands) Credit facility – term loan due 2027 $ 91,250 $ 92,500 Credit facility – revolver due 2027 123,450 63,500 Other 202 211 Total debt $ 214,902 $ 156,211 Current maturities of debt $ 5,030 $ 5,029 Long-term debt 209,872 151,182 Total debt $ 214,902 $ 156,211 Term Loan and Revolving Credit Facility In June 2022, the Company entered into a new Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders (the “Credit Agreement”). The Credit Agreement provides for a $500 million credit facility comprised of a $100 million term loan facility (the “term loan”) and a $400 million multi-currency revolving credit facility available in U.S. dollars, euros, British pound sterling, Swiss francs, Canadian dollars and other currencies as agreed to by the administrative agent and the lenders (the “revolving facility”). The Credit Agreement replaces and refinances the 2015 Credit Agreement. Borrowings under the Credit Agreement were used to repay all outstanding borrowings under the 2015 Credit Agreement, and pay certain fees and expenses incurred in connection with the Credit Agreement, with future borrowings used for other general corporate purposes of the Company and its subsidiaries. The term loan amortizes in quarterly installments of 1.25% in each of the first four years, and quarterly installments of 2.5% in the fifth year of the Credit Agreement. The revolving facility has a $25 million sub-limit for the issuance of letters of credit and a $25 million sub-limit for the borrowing of swingline loans. The maturity date is June 1, 2027. The Company may request up to two one-year extensions of the maturity date. The Company may, upon the agreement of one or more then existing lenders or of additional financial institutions not currently party to the Credit Agreement, increase the revolving facility commitments or obtain incremental term loans by an aggregate amount not to exceed (x) the greater of (i) $168 million or (ii) 100% of consolidated EBITDA (as defined in the Credit Agreement) for the four fiscal quarters ended most recently before such date, plus (y) the amount of any voluntary prepayment of term loans, plus (z) an unlimited amount so long as, immediately after giving effect thereto, the pro forma First Lien Net Leverage Ratio (as defined in the Credit Agreement) does not exceed 2.5 to 1.0. Term loan and revolver facility borrowings in U.S. dollars bear interest, at the Company’s election, at a rate per annum equal to Term SOFR plus 0.10% plus an applicable margin, or an alternate base rate plus an applicable margin, where the alternate base rate is the greater of the prime rate, the federal funds effective rate plus 0.50%, and one-month Term SOFR plus 0.10% plus 1.00%. Term loan borrowings are being made at one-month Term SOFR. The applicable margin for the term benchmark borrowings ranges from 1.0% to 2.0%, and the applicable margin for alternate base rate borrowings ranges from 0% to 1.0%, in each case, based on the total net leverage ratio of the Company and its restricted subsidiaries. The Company may select interest periods of one, three or six months for Term SOFR borrowings. Interest is payable at the end of the selected interest period, but no less frequently than quarterly. The Company’s obligations under the Credit Agreement are guaranteed by its material domestic subsidiaries (each, a “Guarantor”), and secured by a first priority perfected security interest in substantially all of the existing and future personal property of the Company and each Guarantor, subject to certain exceptions. The collateral security described above also secures certain banking services obligations and interest rate swaps and currency or other hedging obligations of the Company owing to any of the then existing lenders or any affiliates thereof. Concurrently with the Company’s entry into the Credit Agreement, the Company also entered into a seven year interest rate swap agreement with Wells Fargo Bank, N.A., Co-Syndication Agent and lender under the Credit Agreement, on $100 million of borrowings under the Credit Agreement. The interest rate swap agreement matures in May 2029. Outstanding borrowings at March 31, 2024 under the Credit Agreement were $214.7 million, consisting of current borrowings of $5 million and long-term debt of $209.7 million; while outstanding borrowings at December 31, 2023 were $156 million, consisting of current borrowings of $5 million and long-term debt of $151 million. Letters of credit outstanding under the Credit Agreement were $2.3 million at both March 31, 2024 and December 31, 2023. At March 31, 2024, the weighted average interest rate under our Credit Agreement was 5.5%, which consisted of $211 million in borrowings under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings, and an alternative base rate borrowing of $3.7 million at 8.8%. At December 31, 2023, the weighted average interest rate under our Credit Agreement was 5%, which consisted of $156 million in borrowings at 5% under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings. During the three months ended March 31, 2024, our average daily alternative base rate loan balance was $1.7 million, compared to a balance of $0.3 million for the three months ended March 31, 2023 and a balance of $0.1 million for the year ended December 31, 2023. The Credit Agreement contains customary covenants limiting, among other things, the incurrence of additional indebtedness, the creation of liens, mergers, consolidations, liquidations and dissolutions, sales of assets, dividends and other payments in respect of equity interests, acquisitions, investments, loans and guarantees, subject, in each case, to customary exceptions, thresholds and baskets. The Credit Agreement also contains customary events of default. Polish Overdraft Facility In November 2023, our Polish subsidiary, SMP Poland sp. z.o.o., further amended its overdraft facility with HSBC Continental Europe (Spolka Akcyjna) Oddzial w Polsce. The overdraft facility, as amended, provides The facility automatically renewed in March 2024 to a June 2024 maturity date. Maturities of Debt As of March 31, 2024, maturities of debt through 2027, assuming no prepayments, are as follows (in thousands): Revolving Credit Facility Term Loan Facility Polish Overdraft Facility and Other Debt Total Remainder of 2024 $ — $ 3,750 $ 22 $ 3,772 2025 — 5,000 31 5,031 2026 — 7,500 48 7,548 2027 123,450 75,000 101 198,551 Total $ 123,450 $ 91,250 $ 202 $ 214,902 Less: Current maturities — (5,000 ) (30 ) (5,030 ) Long-term debt $ 123,450 $ 86,250 $ 172 $ 209,872 Deferred Financing Costs We have deferred financing costs of approximately $1.5 million and $1.6 million as of March 31, 2024 and December 31, 2023, respectively. Deferred financing costs are related to our term loan and revolving credit facilities. Deferred financing costs as of March 31, 2024, assuming no prepayments, are being amortized in the amounts of $0.4 million for the remainder of 2024, $0.5 million in 2025, $0.5 million in 2026 and $0.1 million in 2027.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income Attributable to SMP	3 Months Ended
	Mar. 31, 2024
Accumulated Other Comprehensive Income Attributable to SMP [Abstract]
Accumulated Other Comprehensive Income Attributable to SMP	Note 10. Accumulated Other Comprehensive Income Attributable to SMP Changes in Accumulated Other Comprehensive Income by Component (in thousands) Three Months Ended March 31, 2024 Foreign Currency Translation Unrealized derivative gains (losses) Unrecognized Postretirement Benefit Costs (Credit) Total Balance at December 31, 2023 $ (8,897 ) $ 2,899 $ 24 $ (5,974 ) Other comprehensive income (loss) before reclassifications (1,220 ) 1,888 (a) – 668 Amounts reclassified from accumulated other comprehensive income — (497 ) (3 ) (500 ) Other comprehensive income (loss), net (1,220 ) 1,391 (3 ) 168 Balance at March 31 2024 $ (10,117 ) $ 4,290 $ 21 $ (5,806 ) (a) Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $1.9 million ($ 1.4 Reclassifications Out of Accumulated Other Comprehensive Income (in thousands) Three Months Ended March 31, 2024 Derivative cash flow hedge: Unrecognized (gain) loss (a) $ (671 ) Postretirement benefit plans: Unrecognized (gain) loss (b) (5 ) Total before income tax (676 ) Income tax (expense) benefit (176 ) Total reclassifications $ (500 ) (a) 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. (b) 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 12, “Employee Benefits,” for additional information).

Stock-Based Compensation Plans

Stock-Based Compensation Plans	3 Months Ended
	Mar. 31, 2024
Stock-Based Compensation Plans [Abstract]
Stock-Based Compensation Plans	Note 11. Stock-Based Compensation Plans We account for our stock-based compensation plans in accordance with the provisions of FASB ASC 718, Stock Compensation Restricted and Performance Stock Grants We are authorized to issue, among other things, shares of restricted and performance-based stock to eligible employees and restricted stock to directors of up to shares under the Amended and Restated Omnibus Incentive Plan (“Plan”). As part of the Plan, we currently grant shares of restricted stock to eligible employees and our independent directors and performance-based shares to eligible employees. We grant eligible employees types of restricted stock (standard restricted shares and long-term retention restricted shares). Standard restricted shares granted to employees become fully vested no earlier than after the date of grant. Long-term retention restricted shares granted to selected executives vest at a rate on or within approximately of an executive reaching the ages 60 and 63 and become fully vested on or within approximately of an executive reaching the age 65 Restricted shares granted to directors become fully vested upon the first anniversary of the date of grant. Performance-based shares issued to eligible employees are subject to a three-year measuring period and the achievement of performance targets and, depending upon the achievement of such performance targets, they may become vested no earlier than three years after the date of grant. Each period we evaluate the probability of achieving the applicable targets, and we adjust our accrual accordingly. Restricted shares (other than long-term retention restricted shares) and performance shares issued to certain key executives and directors are subject to a one Our : Shares Weighted Average Grant Date Fair Value Per Share Balance at 2023 880,976 $ 29.48 Granted — — Vested (7,928 ) 27.70 Forfeited (7,150 ) 32.47 Balance at March 31 2024 865,898 $ 29.47 We recorded compensation expense related to restricted shares and performance-based shares of $ million ($ million, net of tax) and $ million ($ million, net of tax) for the three . The unamortized compensation expense related to our restricted and performance-based shares was $ million at March 31, 2024, and is expected to be recognized as they vest over a weighted average period of years and years for employees and directors, respectively.

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2024
Employee Benefits [Abstract]
Employee Benefits	Note 12. Employee Benefits We provide certain medical and dental care benefits to former U.S. union employees. We maintain a defined contribution Supplemental Executive Retirement Plan for key employees. Under the plan, these employees may elect to defer a portion of their compensation and, in addition, we may at our discretion make contributions to the plan on behalf of the employees. In March 2024, we made company contributions to the plan of $0.5 million related to calendar year 2023. We also have an Employee Stock Ownership Plan and Trust for employees who are not covered by a collective bargaining agreement. In connection therewith, we maintain an employee benefits trust to which we contribute shares of treasury stock. We are authorized to instruct the trustees to distribute such shares toward the satisfaction of our future obligations under the plan. The shares held in trust are not considered outstanding for purposes of calculating earnings per share until they are committed to be released. The trustees will vote the shares in accordance with their fiduciary duties. During the three months ended March 31, 2024, we contributed to the trust an additional shares from our treasury and released shares from the trust leaving shares remaining in the trust as of March 31, 2024.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2024
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	Note 13. Derivative Financial Instruments Interest Rate Swap Agreements We occasionally use derivative financial instruments to reduce our market risk for changes in interest rates on our variable rate borrowings. The principal financial instruments used for cash flow hedging purposes are interest rate swap agreements. The interest rate swaps effectively convert a portion of our variable rate borrowings under our existing facilities to a fixed rate based upon determined notional amount. We do not enter into interest rate swap agreements, or other financial instruments, for trading or speculative purposes. In June 2022, we entered into a seven year interest rate swap agreement with a notional amount of $100 million that is to mature in May 2029 The fair value of the interest rate swap agreement as of March 31, 2024

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2024
Fair Value Measurements [Abstract]
Fair Value Measurements	Note 14. Fair Value Measurements We follow a three-level fair value hierarchy that prioritizes the inputs to measure fair value. This hierarchy requires entities to maximize the use of “observable inputs” and minimize the use of “unobservable inputs.” The three levels of inputs used to measure fair value are as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect assumptions that market participants would use in pricing an asset or liability. The following is a summary of the estimated fair values, carrying amounts, and classification under the fair value hierarchy of our financial instruments at March 31, 2024 and December 31, 2023 (in thousands): March 31, 2024 December 31, 2023 Fair Value Hierarchy Fair Value Carrying Amount Fair Value Carrying Amount Cash and cash equivalents (a) LEVEL1/2 $ 27,113 $ 27,113 $ 32,526 $ 32,526 Deferred compensation LEVEL 1 25,674 25,674 23,893 23,893 Short term borrowings LEVEL 2 5,030 5,030 5,029 5,029 Long-term debt LEVEL 2 209,872 209,872 151,182 151,182 Cash flow interest rate swap LEVEL 2 5,820 5,820 3,939 3,939 Long-term investments LEVEL 2 7,522 7,522 7,468 7,468 (a) As of March 31, 2024 cash and cash equivalents consist of cash of $ 24.1 3 29.5 3 Cash equivalents consist of certificates of deposit with original maturities of three months, or less. These securities are accounted for as held-to-maturity and recorded at amortized cost, which approximates their fair values at March 31, 2024. The fair value of the underlying assets held by the deferred compensation plan are based on the quoted market prices of the underlying funds which are held by registered investment companies. The carrying value of our variable rate short-term borrowings and long-term debt under our credit facilities approximates fair value as the variable interest rates in the facilities reflect current market rates. The fair value of our cash flow interest rate swap agreement is obtained from an independent third party, is based upon market quotes, and represents the net amount required to terminate the interest rate swap, taking into consideration market rates and counterparty credit risk.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Note 15. Earnings Per Share The following are reconciliations of the net earnings attributable to SMP and the shares used in calculating basic and dilutive net earnings per common share (in thousands, except per share data): Three Months Ended March 31, 2024 2023 Net Earnings Attributable to SMP - Earnings from continuing operations $ 9,863 $ 12,698 Loss from discontinued operations (1,039 ) (780 ) Net earnings attributable to SMP $ 8,824 $ 11,918 Basic Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 0.45 $ 0.59 Loss from discontinued operations per common share (0.05 ) (0.04 ) Net earnings per common share attributable to SMP $ 0.40 $ 0.55 Weighted average common shares outstanding 21,924 21,610 Diluted Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 0.44 $ 0.57 Loss from discontinued operations per common share (0.05 ) (0.03 ) Net earnings per common share attributable to SMP $ 0.39 $ 0.54 Weighted average common shares outstanding 21,924 21,610 Plus incremental shares from assumed conversions: Dilutive effect of restricted stock and performance-based stock 449 488 Weighted average common shares outstanding – Diluted 22,373 22,098 The shares listed below were not included in the computation of diluted net earnings per common share attributable to SMP because to do so would have been anti-dilutive for the periods presented or because they were excluded under the treasury method (in thousands): Three Months Ended March 31, 2024 2023 Restricted and performance-based shares 281 298

Industry Segments

Industry Segments	3 Months Ended
	Mar. 31, 2024
Industry Segments [Abstract]
Industry Segments	Note 16. Industry Segments Our business is organized into three operating segments, Vehicle Control, Temperature Control and Engineered Solutions, each of which focuses on a specific line of business. Our automotive aftermarket business is comprised of two operating segments, Vehicle Control and Temperature Control, while our Engineered Solutions operating segment offers a broad array of conventional and future-oriented technologies. The following tables show our net sales and operating income for each reportable operating segment (in thousands): Three Months Ended March 31, 2024 2023 Net Sales (a) Vehicle Control $ 185,524 $ 184,577 Temperature Control 71,608 72,406 Engineered Solutions 74,271 71,045 Other — — Consolidated $ 331,403 $ 328,028 Operating Income (Loss) Vehicle Control $ 15,540 $ 17,375 Temperature Control 2,031 2,084 Engineered Solutions 2,232 5,647 Other (5,184 ) (4,360 ) Consolidated $ 14,619 $ 20,746 (a) There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments. For the disaggregation of our net sales from contracts with customers by major product group and geographic area within each of our operating segments, see Note 17, “Net Sales.”

Net Sales

Net Sales	3 Months Ended
	Mar. 31, 2024
Net Sales [Abstract]
Net Sales	Note 17. Net Sales Disaggregation of Net Sales We disaggregate our net sales from contracts with customers by major product group and geographic area within each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our net sales are affected by economic factors. Major Product Group The Vehicle Control operating segment generates its revenues from core aftermarket sales of ignition, emissions, and fuel delivery, electrical and safety, and wire sets and other product categories. The Temperature Control operating segment generates its revenue from aftermarket sales of air conditioning system components and other thermal products. The Engineered Solutions operating segment generates revenues from custom-engineered products to vehicle and equipment manufacturers in highly diversified global end-markets such as commercial and light vehicles, construction, agriculture, power sports and marine. The following table summarizes consolidated net sales by major product group within each operating segment for the three months ended March 31, 2024 and 2023 (in thousands): Three Months Ended March 31, 2024 2023 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 116,085 $ 116,083 Electrical and Safety 52,407 51,804 Wire Sets and Other 17,032 16,690 Total Vehicle Control 185,524 184,577 Temperature Control AC System Components 49,960 50,798 Other Thermal Components 21,648 21,608 Total Temperature Control 71,608 72,406 Engineered Solutions Commercial Vehicle 22,908 20,232 Construction/Agriculture 10,076 11,692 Light Vehicle 21,803 23,019 All Other 19,484 16,102 Total Engineered Solutions 74,271 71,045 Other — — Total $ 331,403 $ 328,028 Geographic Area We sell our line of products primarily in the United States, with additional sales in Canada, Mexico, Europe, Asia and Latin America. Sales are attributed to countries based upon the location of the customer. Our sales are substantially denominated in U.S. dollars. The following tables provide disaggregation of net sales information by geographic area within each operating segment for the three months ended March 31, 2024 and 2023 (in thousands): Three months ended March 31 2024 Vehicle Control Temperature Control Engineered Solutions Other Total Geographic Area: United States $ 164,821 $ 64,665 $ 40,454 $ — $ 269,940 Canada 9,158 6,632 8,182 — 23,972 Europe 283 16 14,206 — 14,505 Mexico 10,020 5 2,207 — 12,232 Asia 101 141 8,561 — 8,803 Other foreign 1,141 149 661 — 1,951 Total $ 185,524 $ 71,608 $ 74,271 $ — $ 331,403 Three months ended March 31 2023 Vehicle Control Temperature Control Engineered Solutions Other Total Geographic Area: United States $ 166,412 $ 69,571 $ 44,206 $ — $ 280,189 Canada 8,330 2,755 5,238 — 16,323 Europe 198 — 15,084 — 15,282 Mexico 8,587 — 1,768 — 10,355 Asia 62 20 4,054 — 4,136 Other foreign 988 60 695 — 1,743 Total $ 184,577 $ 72,406 $ 71,045 $ — $ 328,028

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Note 18. Commitments and Contingencies Asbestos In 1986, we acquired a brake business, which we subsequently sold in March 1998 and which is accounted for as a discontinued operation in the accompanying statement of operations. When we originally acquired this brake business, we assumed future liabilities relating to any alleged exposure to asbestos-containing products manufactured by the seller of the acquired brake business. In accordance with the related purchase agreement, we agreed to assume the liabilities for all new claims filed on or after September 2001. Our ultimate exposure will depend upon the number of claims filed against us on or after September 2001, and the amounts paid for settlements, awards of asbestos-related damages, and defense of such claims. At March 31, 2024, approximately 1,460 cases were outstanding for which we may be responsible for any related liabilities. Since inception in September 2001 through March 31, 2024, the amounts paid for settled claims and awards of asbestos-related damages, including interest, were approximately $77.7 million. We do not have insurance coverage for the indemnity and defense costs associated with the claims we face. In evaluating our potential asbestos-related liability, we have considered various factors including, among other things, an actuarial study of the asbestos related liabilities performed by an independent actuarial firm, our settlement amounts and whether there are any co-defendants, the jurisdiction in which lawsuits are filed, and the status and results of such claims. As is our accounting policy, we consider the advice of actuarial consultants with experience in assessing asbestos-related liabilities to estimate our potential claim liability; and perform an actuarial evaluation in the third quarter of each year and whenever events or changes in circumstances indicate that additional provisions may be necessary. The methodology used to project asbestos-related liabilities and costs in our actuarial study considered: (1) historical data available from publicly available studies; (2) an analysis of our recent claims history to estimate likely filing rates into the future; (3) an analysis of our currently pending claims; (4) an analysis of our settlements and awards of asbestos-related damages to date; and (5) an analysis of closed claims with pay ratios and lag patterns in order to develop average future settlement values. Based on the information contained in the actuarial study and all other available information considered by us, we have concluded that no amount within the range of settlement payments and awards of asbestos-related damages was more likely than any other and, therefore, in assessing our asbestos liability we compare the low end of the range to our recorded liability to determine if an adjustment is required. In accordance with our policy to perform an annual actuarial evaluation in the third quarter of each year, an actuarial study was performed as of August 31, 2023. The results of the August 31, 2023 study included an estimate of our undiscounted liability for settlement payments and awards of asbestos-related damages, excluding legal costs, ranging from $84 million to $135.3 million for the period through 2065. The change from the prior year study, which was as of August 31, 2022, was a $15.2 million increase for the low end of the range and a $23.7 million increase for the high end of the range. The increase in the estimated undiscounted liability from the prior year study at both the low end and high end of the range reflects our actual experience, our historical data and certain assumptions with respect to events that may occur in the future. Based upon the results of the August 31, 2023 actuarial study, in September 2023 we increased our asbestos liability to $84 million, the low end of the range, and recorded an incremental pre-tax provision of $23.8 million in earnings (loss) from discontinued operations in the accompanying statement of operations. Future legal costs, which are expensed as incurred and reported in earnings (loss) from discontinued operations in the accompanying statement of operations, are estimated, according to the August 31, 2023 study, to range from $53.1 million to $105.2 million for the period through 2065. Total operating cash outflows related to discontinued operations, which include settlements, awards of asbestos-related damages and legal costs, net of taxes, were $3 million and $2.6 million for the three months ended March 31, 2024 and 2023, respectively. We plan to perform an annual actuarial evaluation during the third quarter of each year for the foreseeable future and whenever events or changes in circumstances indicate that additional provisions may be necessary. Given the uncertainties associated with projecting such matters into the future and other factors outside our control, we can give no assurance that additional provisions will not be required. We will continue to monitor events and changes in circumstances surrounding these potential liabilities in determining whether to perform additional actuarial evaluations and whether additional provisions may be necessary. At the present time, however, we do not believe that any additional provisions would be reasonably likely to have a material adverse effect on our liquidity or consolidated financial position. Other Litigation We are currently involved in various other legal claims and legal proceedings (some of which may involve substantial amounts), including claims related to commercial disputes, product liability, employment, and environmental. Although these legal claims and legal proceedings are subject to inherent uncertainties, based on our understanding and evaluation of the relevant facts and circumstances, we believe that the ultimate outcome of these matters will not, either individually or in the aggregate, have a material adverse effect on our business, financial condition or results of operations. We may at any time determine that settling any of these matters is in our best interests, which settlement may include substantial payments. Although we cannot currently predict the specific amount of any liability that may ultimately arise with respect to any of these matters, we will record provisions when the liability is considered probable and reasonably estimable. Significant judgment is required in both the determination of probability and the determination as to whether an exposure can be reasonably estimated. As additional information becomes available, we reassess our potential liability related to these matters. Such revisions of the potential liabilities could have a material adverse effect on our business, financial condition or results of operations. Warranties We generally warrant our products against certain manufacturing and other defects. These product warranties are provided for specific periods of time of the product depending on the nature of the product. As of March 31, 2024 and 2023, we have accrued $23.1 million and $20.6 million, respectively, for estimated product warranty claims included in accrued customer returns. The accrued product warranty costs are based primarily on historical experience of actual warranty claims. The following table provides the changes in our product warranties (in thousands): Three Months Ended March 31, 2024 2023 Balance, beginning of period $ 21,134 $ 19,667 Liabilities accrued for current year sales 28,677 25,793 Settlements of warranty claims (26,719 ) (24,860 ) Balance, end of period $ 23,092 $ 20,600

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2024
Basis of Presentation [Abstract]
Principles of Consolidation	Standard Motor Products, Inc. and its subsidiaries (referred to hereinafter in these notes to the consolidated financial statements as “we,” “us,” “our,” “SMP,” or the “Company”) is a leading manufacturer and distributor of premium replacement parts in the automotive aftermarket, and a custom-engineered solutions provider to vehicle and equipment manufacturers in diverse non-aftermarket end markets. Our automotive aftermarket is comprised of two segments, Vehicle Control and Temperature Control, while our Engineered Solutions segment offers a broad array of conventional and future-oriented technologies in markets for commercial and light vehicles, construction, agriculture, power sports, marine, hydraulics and lawn and garden. We sell our products primarily to retailers, warehouse distributors, original equipment manufacturers and original equipment service part operations in the United States, Canada, Europe, Asia, Mexico and other Latin American countries. The accompanying unaudited financial information should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form -K for the year ended December The unaudited consolidated financial statements include our accounts and all domestic and international companies in which we have more than a equity ownership, except in instances where the minority shareholder maintains substantive participating rights, in which case we follow the equity method of accounting. In instances where we have more than a equity ownership and the minority shareholder does not maintain substantive participating rights, our consolidated financial statements include the accounts of the company on a consolidated basis with its net income and equity reported at amounts attributable to both our equity position and that of the noncontrolling interest. Investments in unconsolidated affiliates are accounted for on the equity method, as we do not have a controlling financial interest but have the ability to exercise significant influence. All significant inter-company items have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form -Q and Rule - of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for the interim periods are not necessarily indicative of the results of operations for the entire year.
Reclassification	Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2024 presentation.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Standards not yet adopted as of March 31, 2024 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required effective income tax rate reconciliation disclosures to include (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, the ASU 2023-09 will expand required annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is December 31, 2025, with prospective application. Early adoption and retrospective application are permitted. The new standard will require expanding our annual income tax disclosures in our financial statements. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2025. We have reviewed all other recently issued accounting pronouncements and concluded they were either not applicable or not expected to have a material impact on the Company’s consolidated financial statements.

Business Acquisitions and Inv_2

Business Acquisitions and Investments (Tables)	3 Months Ended
	Mar. 31, 2024
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co Ltd [Member]
Business Acquisition [Line Items]
Allocation of Purchase Price, Assets Acquired And Liabilities Assumed	The following table summarizes the allocation of the total step acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (a) $ 21,725 Assets acquired and liabilities assumed: Cash and cash equivalents $ 6,779 Receivables 5,912 Inventory 5,945 Other current assets 528 Property, plant and equipment, net 2,924 Operating lease right-of-use assets 4,372 Intangible assets (b) 532 Goodwill 2,208 Long term investments and other assets 7,257 Current liabilities (6,004 ) Noncurrent operating lease liabilities (3,455 ) Subtotal 26,998 Fair value of acquired noncontrolling interest (5,273 ) Total purchase consideration allocated to net assets acquired $ 21,725 (a) Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest. (b) Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million.

Restructuring and Integration_2

Restructuring and Integration Expenses (Tables)	3 Months Ended
	Mar. 31, 2024
Restructuring and Integration Expenses [Abstract]
Restructuring and Integration Expense	The aggregated liabilities included in “sundry payables and accrued expenses” and “other accrued liabilities” in the consolidated balance sheet relating to the restructuring and integration activities as of March 31, 2024 and December 31, 2023 and for the three months ended March 31, 2024, consisted of the following (in thousands): Workforce Reduction Other Exit Costs Total Exit activity liability at December 31, 2023 $ 1,729 $ — $ 1,729 Restructuring and integration costs: Amounts provided for during 2024 (a) 17 175 192 Cash payments (415 ) (175 ) (590 ) Foreign currency exchange rate changes (18 ) — (18 ) Exit activity liability at March 31, 2024 $ 1,313 $ — $ 1,313 (a) Restructuring and integration expenses incurred during the three months ended March 31, 2024 consist of $101,000 in our Vehicle Control segment, $58,000 in our Temperature Control segment and $33,000 in our Engineered Solutions segment.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2024
Inventories [Abstract]
Inventories	Inventories, which are stated at the lower of cost (determined by means of the first-in, first-out method) and net realizable value, consist of the following: March 31, 2024 December 31, 2023 (In thousands) Finished goods $ 314,809 $ 302,557 Work in process 17,344 18,503 Raw materials 188,549 186,015 Subtotal 520,702 507,075 Unreturned customer inventories 18,007 18,240 Total inventories $ 538,709 $ 525,315

Acquired Intangible Assets (Tab

Acquired Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2024
Acquired Intangible Assets [Abstract]
Acquired Identifiable Intangible Assets	Acquired identifiable intangible assets consist of the following: March 31, 2024 December 31, 2023 (In thousands) Customer relationships $ 159,843 $ 159,641 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 8,880 8,880 Non-compete agreements 3,308 3,295 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets 187,114 186,899 Less: Accumulated amortization (a) (98,163 ) (95,681 ) Net acquired intangible assets $ 88,951 $ 91,218 (a) Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which has an indefinite useful life and, as such, is not being amortized.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Quantitative Disclosures Related to Operating Leases	The following tables provide quantitative disclosures related to our operating leases and includes all operating leases acquired from the date of acquisition (in thousands): Balance Sheet Information March 31, 2024 December 31, 2023 Assets Operating lease right-of-use assets $ 102,060 $ 100,065 Liabilities Sundry payables and accrued expenses $ 17,973 $ 17,139 Noncurrent operating lease liabilities 90,667 88,974 Total operating lease liabilities $ 108,640 $ 106,113 Weighted Average Remaining Lease Term Operating leases 8.3 8.3 Weighted Average Discount Rate Operating leases 4.9% 4.8% Three Months Ended Expense and Cash Flow Information March 31, Lease Expense 2024 2023 Operating lease expense (a) $ 4,820 $ 3,109 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 4,131 $ 2,834 Right-of-use assets obtained in exchange for new operating lease obligations (b) $ 5,628 $ 29,092 (a) Excludes expenses of approximately $0.8 million for each of the three months ended March 31, 2024 and 2023, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material. (b) Includes $ 4.7
Minimum Lease Payments	At March 31, 2024, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows (in thousands): 2024 $ 13,904 2025 16,624 2026 15,190 2027 14,245 2028 12,616 Thereafter 62,092 Total lease payments $ 134,671 Less: Interest (26,031 ) Present value of lease liabilities $ 108,640

Credit Facilities and Long-Te_2

Credit Facilities and Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2024
Credit Facilities and Long-Term Debt [Abstract]
Summary of Total Debt Outstanding	Total debt outstanding is summarized as follows: March 31, 2024 December 31, 2023 (In thousands) Credit facility – term loan due 2027 $ 91,250 $ 92,500 Credit facility – revolver due 2027 123,450 63,500 Other 202 211 Total debt $ 214,902 $ 156,211 Current maturities of debt $ 5,030 $ 5,029 Long-term debt 209,872 151,182 Total debt $ 214,902 $ 156,211
Maturities of Debt	As of March 31, 2024, maturities of debt through 2027, assuming no prepayments, are as follows (in thousands): Revolving Credit Facility Term Loan Facility Polish Overdraft Facility and Other Debt Total Remainder of 2024 $ — $ 3,750 $ 22 $ 3,772 2025 — 5,000 31 5,031 2026 — 7,500 48 7,548 2027 123,450 75,000 101 198,551 Total $ 123,450 $ 91,250 $ 202 $ 214,902 Less: Current maturities — (5,000 ) (30 ) (5,030 ) Long-term debt $ 123,450 $ 86,250 $ 172 $ 209,872

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income Attributable to SMP (Tables)	3 Months Ended
	Mar. 31, 2024
Accumulated Other Comprehensive Income Attributable to SMP [Abstract]
Changes in Accumulated Other Comprehensive Income by Component	Changes in Accumulated Other Comprehensive Income by Component (in thousands) Three Months Ended March 31, 2024 Foreign Currency Translation Unrealized derivative gains (losses) Unrecognized Postretirement Benefit Costs (Credit) Total Balance at December 31, 2023 $ (8,897 ) $ 2,899 $ 24 $ (5,974 ) Other comprehensive income (loss) before reclassifications (1,220 ) 1,888 (a) – 668 Amounts reclassified from accumulated other comprehensive income — (497 ) (3 ) (500 ) Other comprehensive income (loss), net (1,220 ) 1,391 (3 ) 168 Balance at March 31 2024 $ (10,117 ) $ 4,290 $ 21 $ (5,806 ) (a) Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $1.9 million ($ 1.4
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications Out of Accumulated Other Comprehensive Income (in thousands) Three Months Ended March 31, 2024 Derivative cash flow hedge: Unrecognized (gain) loss (a) $ (671 ) Postretirement benefit plans: Unrecognized (gain) loss (b) (5 ) Total before income tax (676 ) Income tax (expense) benefit (176 ) Total reclassifications $ (500 ) (a) 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. (b) 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 12, “Employee Benefits,” for additional information).

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2024
Stock-Based Compensation Plans [Abstract]
Restricted and Performance-based Share Activity	Our : Shares Weighted Average Grant Date Fair Value Per Share Balance at 2023 880,976 $ 29.48 Granted — — Vested (7,928 ) 27.70 Forfeited (7,150 ) 32.47 Balance at March 31 2024 865,898 $ 29.47

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Measurements [Abstract]
Summary of Estimated Fair Values, Carrying Amounts and Classification under Fair Value Hierarchy	The following is a summary of the estimated fair values, carrying amounts, and classification under the fair value hierarchy of our financial instruments at March 31, 2024 and December 31, 2023 (in thousands): March 31, 2024 December 31, 2023 Fair Value Hierarchy Fair Value Carrying Amount Fair Value Carrying Amount Cash and cash equivalents (a) LEVEL1/2 $ 27,113 $ 27,113 $ 32,526 $ 32,526 Deferred compensation LEVEL 1 25,674 25,674 23,893 23,893 Short term borrowings LEVEL 2 5,030 5,030 5,029 5,029 Long-term debt LEVEL 2 209,872 209,872 151,182 151,182 Cash flow interest rate swap LEVEL 2 5,820 5,820 3,939 3,939 Long-term investments LEVEL 2 7,522 7,522 7,468 7,468 (a) As of March 31, 2024 cash and cash equivalents consist of cash of $ 24.1 3 29.5 3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Reconciliations of Earnings Available to Common Stockholders and Shares used in Calculating Basic and Dilutive Net Earnings per Common Share	The following are reconciliations of the net earnings attributable to SMP and the shares used in calculating basic and dilutive net earnings per common share (in thousands, except per share data): Three Months Ended March 31, 2024 2023 Net Earnings Attributable to SMP - Earnings from continuing operations $ 9,863 $ 12,698 Loss from discontinued operations (1,039 ) (780 ) Net earnings attributable to SMP $ 8,824 $ 11,918 Basic Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 0.45 $ 0.59 Loss from discontinued operations per common share (0.05 ) (0.04 ) Net earnings per common share attributable to SMP $ 0.40 $ 0.55 Weighted average common shares outstanding 21,924 21,610 Diluted Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 0.44 $ 0.57 Loss from discontinued operations per common share (0.05 ) (0.03 ) Net earnings per common share attributable to SMP $ 0.39 $ 0.54 Weighted average common shares outstanding 21,924 21,610 Plus incremental shares from assumed conversions: Dilutive effect of restricted stock and performance-based stock 449 488 Weighted average common shares outstanding – Diluted 22,373 22,098
Anti-dilutive Securities Excluded from Computation of Earnings per Share	The shares listed below were not included in the computation of diluted net earnings per common share attributable to SMP because to do so would have been anti-dilutive for the periods presented or because they were excluded under the treasury method (in thousands): Three Months Ended March 31, 2024 2023 Restricted and performance-based shares 281 298

Industry Segments (Tables)

Industry Segments (Tables)	3 Months Ended
	Mar. 31, 2024
Industry Segments [Abstract]
Sales and Operating Income by Operating Segments	The following tables show our net sales and operating income for each reportable operating segment (in thousands): Three Months Ended March 31, 2024 2023 Net Sales (a) Vehicle Control $ 185,524 $ 184,577 Temperature Control 71,608 72,406 Engineered Solutions 74,271 71,045 Other — — Consolidated $ 331,403 $ 328,028 Operating Income (Loss) Vehicle Control $ 15,540 $ 17,375 Temperature Control 2,031 2,084 Engineered Solutions 2,232 5,647 Other (5,184 ) (4,360 ) Consolidated $ 14,619 $ 20,746 (a) There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.

Net Sales (Tables)

Net Sales (Tables)	3 Months Ended
	Mar. 31, 2024
Net Sales [Abstract]
Disaggregation of Net Sales	The following table summarizes consolidated net sales by major product group within each operating segment for the three months ended March 31, 2024 and 2023 (in thousands): Three Months Ended March 31, 2024 2023 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 116,085 $ 116,083 Electrical and Safety 52,407 51,804 Wire Sets and Other 17,032 16,690 Total Vehicle Control 185,524 184,577 Temperature Control AC System Components 49,960 50,798 Other Thermal Components 21,648 21,608 Total Temperature Control 71,608 72,406 Engineered Solutions Commercial Vehicle 22,908 20,232 Construction/Agriculture 10,076 11,692 Light Vehicle 21,803 23,019 All Other 19,484 16,102 Total Engineered Solutions 74,271 71,045 Other — — Total $ 331,403 $ 328,028

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies [Abstract]
Changes in Product Warranties	The following table provides the changes in our product warranties (in thousands): Three Months Ended March 31, 2024 2023 Balance, beginning of period $ 21,134 $ 19,667 Liabilities accrued for current year sales 28,677 25,793 Settlements of warranty claims (26,719 ) (24,860 ) Balance, end of period $ 23,092 $ 20,600

Basis of Presentation (Details)

Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2024 Segment
Basis of Presentation [Abstract]
Number of reportable segments	2
Equity ownership in entities included in consolidated financial statements, minimum	50%

Business Acquisitions and Inv_3

Business Acquisitions and Investments (Details) $ in Thousands		1 Months Ended	6 Months Ended
		Jul. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Dec. 31, 2022	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Apr. 30, 2014 USD ($)
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates				$ 24,751	$ 24,050
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill				$ 134,624	$ 134,729
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co Ltd [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Percentage of equity interest acquired		15%		80%		15%	65%	15%	15%	50%
Investments in unconsolidated affiliates		$ 4,000				¥ 27,378,290		$ 4,200	¥ 26,475,583	$ 14,000
Total purchase consideration	[1]	21,725
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents		6,779
Receivables		5,912
Inventory		5,945
Other current assets		528
Property, plant, and equipment, net		2,924
Operating lease right-of-use assets		4,372
Intangible assets	[2]	532
Goodwill		2,208
Long term investments and other assets		7,257
Current liabilities		(6,004)
Noncurrent operating lease liabilities		(3,455)
Subtotal		26,998
Fair value of acquired noncontrolling interest		(5,273)
Net assets acquired		21,725
Equity investment interest held			$ 17,700
Cash paid for the acquisition of equity interest		4,000
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co Ltd [Member] | Temperature Control Segment [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill		1,200
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co Ltd [Member] | Engineered Solutions Segment [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill		$ 1,000
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co Ltd [Member] | Customer Relationships [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Estimated useful life of intangible assets		10 years				10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets		$ 400
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co Ltd [Member] | Capitalized Software [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets		$ 100
[1]Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest.[2]Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million.

Restructuring and Integration_3

Restructuring and Integration Expenses (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		$ 1,729
Amounts provided for during 2024 (a)		192	[1]	$ 912
Cash payments		(590)
Foreign currency exchange rate changes		(18)
Exit activity liability, end of period		1,313
Restructuring Costs [Abstract]
Employee severance costs		17
Expenses related to relocation of machinery and equipment		175
Vehicle Control Segment [Member]
Restructuring and integration activities [Roll Forward]
Amounts provided for during 2024 (a)		101
Temperature Control Segment [Member]
Restructuring and integration activities [Roll Forward]
Amounts provided for during 2024 (a)		58
Engineered Solutions Segment [Member]
Restructuring and integration activities [Roll Forward]
Amounts provided for during 2024 (a)		33
Workforce Reduction [Member]
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		1,729
Amounts provided for during 2024 (a)	[1]	17
Cash payments		(415)
Foreign currency exchange rate changes		(18)
Exit activity liability, end of period		1,313
Other Exit Costs [Member]
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		0
Amounts provided for during 2024 (a)	[1]	175
Cash payments		(175)
Foreign currency exchange rate changes		0
Exit activity liability, end of period		$ 0
[1]Restructuring and integration expenses incurred during the three months ended March 31, 2024 consist of $101,000 in our Vehicle Control segment, $58,000 in our Temperature Control segment and $33,000 in our Engineered Solutions segment.

Sale of Receivables (Details)

Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 170.8	$ 170.9
Receivables not yet collected	10.9		$ 4.5
Charge related to sale of receivables	$ 10	$ 9

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Inventories [Abstract]
Finished goods	$ 314,809	$ 302,557
Work in process	17,344	18,503
Raw materials	188,549	186,015
Subtotal	520,702	507,075
Unreturned customer inventories	18,007	18,240
Total inventories	$ 538,709	$ 525,315

Acquired Intangible Assets, Ide

Acquired Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		$ 187,114	$ 186,899
Less Accumulated amortization	[1]	(98,163)	(95,681)
Net acquired intangible assets		88,951	91,218
Customer Relationships [Member]
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		159,843	159,641
Patents, Developed Technology and Intellectual Property [Member]
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		14,123	14,123
Trademarks and Trade Names [Member]
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		8,880	8,880
Acquired indefinite-lived intangible assets		2,600
Non-compete Agreements [Member]
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		3,308	3,295
Supply Agreements [Member]
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		800	800
Leaseholds [Member]
Indefinite Lived Intangible Assets [Abstract]
Acquired intangible assets		$ 160	$ 160
[1]Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which has an indefinite useful life and, as such, is not being amortized.

Acquired Intangible Assets, Amo

Acquired Intangible Assets, Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Amortization of acquired intangible assets [Abstract]
Amortization expense	$ 2.1	$ 2.2
Estimated amortization expense, remainder of 2024	6.4
Estimated amortization expense in year 2025	8.5
Estimated amortization expense in year 2026	8.5
Estimated amortization expense in year 2027	8.5
Estimated amortization expense in years 2028 through 2041	$ 54.5

Leases (Details)

Leases (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Quantitative Lease Disclosures [Abstract]
Renewal option period		5 years
Assets [Abstract]
Operating lease right-of-use assets		$ 102,060		$ 100,065
Liabilities [Abstract]
Sundry payables and accrued expenses		17,973		17,139
Noncurrent operating lease liabilities		90,667		88,974
Total operating lease liabilities		$ 108,640		$ 106,113
Operating Leases [Abstract]
Weighted average remaining lease term		8 years 3 months 18 days		8 years 3 months 18 days
Weighted average discount rate		4.90%		4.80%
Lease Expense [Abstract]
Operating lease expense	[1]	$ 4,820	$ 3,109
Excluded non-lease expenses		800	800
Cash paid for the amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases		4,131	2,834
Right-of-use assets obtained in exchange for new operating lease obligations	[2]	5,628	29,092
Minimum Lease Payments [Abstract]
2024		13,904
2025		16,624
2026		15,190
2027		14,245
2028		12,616
Thereafter		62,092
Total lease payments		134,671
Less: Interest		(26,031)
Total operating lease liabilities		$ 108,640		$ 106,113
Maximum [Member]
Quantitative Lease Disclosures [Abstract]
Remaining operating lease terms		10 years
Poland
Cash paid for the amounts included in the measurement of lease liabilities [Abstract]
Right-of-use assets related to lease modifications and extension		$ 4,700
Texas
Cash paid for the amounts included in the measurement of lease liabilities [Abstract]
Right-of-use assets related to lease modifications and extension			$ 27,800
[1]Excludes expenses of approximately $0.8 million for each of the three months ended March 31, 2024 and 2023, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material.[2]Includes $ 4.7

Credit Facilities and Long-Te_3

Credit Facilities and Long-Term Debt, Total Debt Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instruments [Abstract]
Total debt	$ 214,902	$ 156,211
Current maturities of debt	5,030	5,029
Long-term debt	209,872	151,182
Credit Facility - Term Loan Due 2027 [Member]
Debt Instruments [Abstract]
Total debt	91,250	92,500
Current maturities of debt	5,000
Long-term debt	86,250
Credit Facility - Revolver Due 2027 [Member]
Debt Instruments [Abstract]
Total debt	123,450	63,500
Current maturities of debt	0
Long-term debt	123,450
Other [Member]
Debt Instruments [Abstract]
Total debt	202	$ 211
Current maturities of debt	30
Long-term debt	$ 172

Credit Facilities and Long-Te_4

Credit Facilities and Long-Term Debt, Term Loan and Revolving Credit Facilities (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) Installment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)
Term Loan and Revolving Credit Facilities [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity				$ 500
Maturity date	Jun. 01, 2027
Frequency of periodic payment	quarterly
Debt instrument, extension period	1 year
Borrowing base	$ 168
Maximum consolidated EBITDA	1
Net Leverage Ratio	250%
Outstanding borrowings under credit facility	$ 214.7		$ 156
Current portion of debt	5		5
Long-term debt	209.7		151
Outstanding letters of credit	$ 2.3		$ 2.3
Weighted average interest rate	5.50%		5%
Term Loan and Revolving Credit Facilities [Member] | SOFR [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	0.10%
Term of variable rate	1 month
Interest rate periods	one, three or six months
Outstanding borrowings under credit facility	$ 211		$ 156
Weighted average interest rate			5%
Term Loan and Revolving Credit Facilities [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	0.50%
Term Loan and Revolving Credit Facilities [Member] | Term Benchmark Borrowings [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	1%
Term Loan and Revolving Credit Facilities [Member] | Term Benchmark Borrowings [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	2%
Term Loan and Revolving Credit Facilities [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	1%
Outstanding borrowings under credit facility	$ 3.7
Weighted average interest rate	8.80%
Average daily loan balance outstanding	$ 1.7	$ 0.3	$ 0.1
Term Loan and Revolving Credit Facilities [Member] | Alternate Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	0%
Term Loan and Revolving Credit Facilities [Member] | Alternate Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	1%
Term Loan Facility [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity				100
Term Loan Facility [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Number of extensions of maturity date | Installment	2
Term Loan Facility [Member] | First Four Years [Member]
Line of Credit Facility [Abstract]
Periodic payment amortization percentage	1.25%
Term Loan Facility [Member] | Fifth Year [Member]
Line of Credit Facility [Abstract]
Periodic payment amortization percentage	2.50%
Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity				400
Letter of Credit Sublimit [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity	$ 25
Swing Line Loans [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity	25
Interest Rate Swap Agreement [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity	$ 100
Term of variable rate	1 month
Period of agreement	7 years
Outstanding borrowings under credit facility	$ 100		$ 100	$ 100

Credit Facilities and Long-Te_5

Credit Facilities and Long-Term Debt, Polish Overdraft Facility (Details) - Polish Overdraft Facility [Member] zł in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2023 USD ($)	Nov. 30, 2023 PLN (zł)
Line of Credit Facility [Abstract]
Maximum borrowing capacity			$ 7.5	zł 30
Threshold percentage of borrowing capacity	85%
Threshold borrowing capacity limit	$ 6.4
Overdraft facility renewal period	3 months
Overdraft facility cancellation period	30 days
Overdraft facility	$ 0	$ 0
1M WIBOR [Member]
Line of Credit Facility [Abstract]
Basis spread on variable rate	1%
1M EURIBOR [Member]
Line of Credit Facility [Abstract]
Basis spread on variable rate	1%
Mid-Point of Fed Target Range [Member]
Line of Credit Facility [Abstract]
Basis spread on variable rate	1.25%

Credit Facilities and Long-Te_6

Credit Facilities and Long-Term Debt, Maturities of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Maturities of Debt [Abstract]
Remainder of 2024	$ 3,772
2025	5,031
2026	7,548
2027	198,551
Total debt	214,902	$ 156,211
Less: Current maturities	(5,030)	(5,029)
Long-term debt	209,872	151,182
Revolving Credit Facility [Member]
Maturities of Debt [Abstract]
Remainder of 2024	0
2025	0
2026	0
2027	123,450
Total debt	123,450	63,500
Less: Current maturities	0
Long-term debt	123,450
Term Loan Facility [Member]
Maturities of Debt [Abstract]
Remainder of 2024	3,750
2025	5,000
2026	7,500
2027	75,000
Total debt	91,250	92,500
Less: Current maturities	(5,000)
Long-term debt	86,250
Polish Overdraft Facility and Other Debt [Member]
Maturities of Debt [Abstract]
Remainder of 2024	22
2025	31
2026	48
2027	101
Total debt	202	$ 211
Less: Current maturities	(30)
Long-term debt	$ 172

Credit Facilities and Long-Te_7

Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Deferred Financing Costs [Abstract]
Deferred financing costs	$ 1.5	$ 1.6
Deferred Finance Costs, Amortization [Abstract]
Remainder of 2024	0.4
2025	0.5
2026	0.5
2027	$ 0.1

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income Attributable to SMP, Changes in Accumulated Other Comprehensive Income by Component (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at December 31, 2023	$ 635,064
Other comprehensive income (loss) before reclassifications	668
Amounts reclassified from accumulated other comprehensive income	(500)
Other comprehensive income (loss), net	168
Balance at March 31, 2024	639,150
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Unrecognized gain relating to change in fair value of cash flow interest rate hedge	1,900
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax	1,400
Unrecognized gain, net of cash settlements	700
Unrecognized gain, net of cash settlements, net of tax	500
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at December 31, 2023	(5,974)
Balance at March 31, 2024	(5,806)
Foreign Currency Translation [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at December 31, 2023	(8,897)
Other comprehensive income (loss) before reclassifications	(1,220)
Amounts reclassified from accumulated other comprehensive income	0
Other comprehensive income (loss), net	(1,220)
Balance at March 31, 2024	(10,117)
Unrealized Derivative Gains (Losses) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at December 31, 2023	2,899
Other comprehensive income (loss) before reclassifications	1,888	[1]
Amounts reclassified from accumulated other comprehensive income	(497)
Other comprehensive income (loss), net	1,391
Balance at March 31, 2024	4,290
Unrecognized Postretirement Benefit Costs (Credit) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance at December 31, 2023	24
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	(3)
Other comprehensive income (loss), net	(3)
Balance at March 31, 2024	$ 21
[1]Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $1.9 million ($ 1.4

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income Attributable to SMP, Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Details About Accumulated Other Comprehensive Income Components [Abstract]
Interest expense		$ 2,067	$ 3,862
Other non-operating income (expense), net		819	225
Earnings from continuing operations before income taxes		13,371	17,109
Income tax (expense) benefit		3,342	4,372
Net earnings attributable to SMP	[1]	8,824	$ 11,918
Reclassification out of Accumulated Other Comprehensive Income [Member]
Details About Accumulated Other Comprehensive Income Components [Abstract]
Earnings from continuing operations before income taxes		(676)
Income tax (expense) benefit		(176)
Net earnings attributable to SMP		(500)
Unrealized Derivative Gains (Losses) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details About Accumulated Other Comprehensive Income Components [Abstract]
Interest expense	[2]	(671)
Unrecognized Postretirement Benefit Costs (Credit) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details About Accumulated Other Comprehensive Income Components [Abstract]
Other non-operating income (expense), net	[3]	$ (5)
[1] Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Type $ / shares shares	Mar. 31, 2023 USD ($)
Restricted and Performance Stock Grants [Abstract]
Number of types of restricted stock | Type	2
Additional Disclosures [Abstract]
Compensation expense, gross | $	$ 1,270	$ 1,532
Restricted Shares [Member] | Minimum [Member]
Restricted and Performance Stock Grants [Abstract]
Expiration of vesting period	3 years
Restricted Shares [Member] | Employees [Member]
Restricted and Performance Stock Grants [Abstract]
Estimated forfeitures	5%
Restricted Shares [Member] | Executives [Member]
Restricted and Performance Stock Grants [Abstract]
Estimated forfeitures	0%
Restricted Shares [Member] | Directors [Member]
Restricted and Performance Stock Grants [Abstract]
Estimated forfeitures	0%
Restricted Shares [Member] | Age 60 [Member] | Executives [Member]
Restricted and Performance Stock Grants [Abstract]
Vesting percentage	25%
Vesting period before reaching age limit	2 months
Restricted Shares [Member] | Age 63 [Member] | Executives [Member]
Restricted and Performance Stock Grants [Abstract]
Vesting percentage	25%
Vesting period before reaching age limit	2 months
Restricted Shares [Member] | Age 65 [Member] | Executives [Member]
Restricted and Performance Stock Grants [Abstract]
Vesting percentage	100%
Vesting period before reaching age limit	2 months
Performance-based Shares [Member]
Restricted and Performance Stock Grants [Abstract]
Measuring period for performance-based shares	3 years
Performance-based Shares [Member] | Minimum [Member]
Restricted and Performance Stock Grants [Abstract]
Expiration of vesting period	3 years
Restricted and Performance-Based Shares [Member]
Restricted and performance-based stock, shares [Roll Forward]
Beginning of period (in shares)	880,976
Granted (in shares)	0
Vested (in shares)	(7,928)
Forfeited (in shares)	(7,150)
End of period (in shares)	865,898
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]
Beginning of period (in dollars per share) | $ / shares	$ 29.48
Granted (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	27.7
Forfeited (in dollars per share) | $ / shares	32.47
End of period (in dollars per share) | $ / shares	$ 29.47
Additional Disclosures [Abstract]
Compensation expense, gross | $	$ 1,300	1,500
Compensation expense, net of tax | $	1,000	$ 1,100
Unamortized compensation expense | $	$ 11,400
Restricted and Performance-Based Shares [Member] | Employees [Member]
Additional Disclosures [Abstract]
Weighted average period of recognition for unrecognized compensation expense	3 years 11 months 8 days
Restricted and Performance-Based Shares [Member] | Directors [Member]
Additional Disclosures [Abstract]
Weighted average period of recognition for unrecognized compensation expense	29 days
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member]
Restricted and Performance Stock Grants [Abstract]
Holding period for restricted and performance shares issued	1 year
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member]
Restricted and Performance Stock Grants [Abstract]
Holding period for restricted and performance shares issued	2 years
2016 Omnibus Incentive Plan [Member] | Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]
Shares authorized for issuance (in shares)	2,050,000

Employee Benefits (Details)

Employee Benefits (Details) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2024 USD ($) shares	Mar. 31, 2024 Employee shares
Benefit Plan [Abstract]
Number of former union employees covered by the plan | Employee		13
Supplemental Executive Retirement Plan [Member]
Defined Contribution Pension and Other Postretirement Plans [Abstract]
Employer discretionary contribution amount | $	$ 0.5
Employee Stock Ownership Plan and Trust (ESOP) [Member]
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]
Additional shares contributed to ESOP (in shares)		68,700
Shares released from trust (in shares)	68,700	68,700
Total remaining balance of shares in the ESOP (in shares)	200	200

Derivative Financial Instrume_2

Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2022
Interest Rate Swap Agreement [Member]
Notional Disclosures [Abstract]
Derivative term of contract	7 years
Borrowings under credit agreement	$ 100	$ 100	$ 100
Term of variable rate	1 month
Fixed interest rate	2.683%
Derivative, credit spread adjustment percentage	0.10%
Margin on variable rate	1.25%
Interest Rate Swap [Member]
Notional Disclosures [Abstract]
Derivative term of contract	7 years
Derivative, notional amount			$ 100
Derivative contract, maturity date	May 31, 2029
Derivative fair value	$ 5.8	$ 3.9

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
LEVEL 1 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash		$ 29,500	$ 24,100
LEVEL 2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash equivalents		3,000	3,000
Fair Value [Member] | LEVEL 1/2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash and cash equivalents	[1]	27,113	32,526
Fair Value [Member] | LEVEL 1 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Deferred compensation		25,674	23,893
Fair Value [Member] | LEVEL 2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Short term borrowings		5,030	5,029
Long-term debt		209,872	151,182
Cash flow interest rate swap		5,820	3,939
Long-term investments		7,522	7,468
Carrying Amount [Member] | LEVEL 1/2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash and cash equivalents	[1]	27,113	32,526
Carrying Amount [Member] | LEVEL 1 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Deferred compensation		25,674	23,893
Carrying Amount [Member] | LEVEL 2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Short term borrowings		5,030	5,029
Long-term debt		209,872	151,182
Cash flow interest rate swap		5,820	3,939
Long-term investments		$ 7,522	$ 7,468
[1] As of March 31, 2024 cash and cash equivalents consist of cash of $ 24.1 3 29.5 3

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Net Earnings Attributable to SMP [Abstract]
Earnings from continuing operations		$ 9,863	$ 12,698
Loss from discontinued operations		(1,039)	(780)
Net earnings attributable to SMP	[1]	$ 8,824	$ 11,918
Basic Net Earnings Per Common Share Attributable to SMP [Abstract]
Earnings from continuing operations per common share (in dollars per share)		$ 0.45	$ 0.59
Loss from discontinued operations per common share (in dollars per share)		(0.05)	(0.04)
Net earnings per common share - Basic (in dollars per share)		$ 0.4	$ 0.55
Weighted average common shares outstanding (in shares)		21,923,830	21,609,618
Diluted Net Earnings Per Common Share Attributable to SMP [Abstract]
Earnings from continuing operations per common share (in dollars per share)		$ 0.44	$ 0.57
Loss from discontinued operations per common share (in dollars per share)		(0.05)	(0.03)
Net earnings per common share - Diluted (in dollars per share)		$ 0.39	$ 0.54
Weighted average common shares outstanding (in shares)		21,923,830	21,609,618
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance-based stock (in shares)		449,000	488,000
Weighted average common shares outstanding - Diluted (in shares)		22,372,543	22,097,750
Restricted and Performance-Based Shares [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		281,000	298,000
[1] Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Industry Segments (Details)

Industry Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2024 USD ($) Segment	Mar. 31, 2023 USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]
Number of operating segments | Segment		3
Net sales	[1]	$ 331,403	$ 328,028
Operating Income (Loss)		14,619	20,746
Vehicle Control [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	185,524	184,577
Operating Income (Loss)		15,540	17,375
Temperature Control [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	71,608	72,406
Operating Income (Loss)		2,031	2,084
Engineered Solutions [Member] | Reportable Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	74,271	71,045
Operating Income (Loss)		2,232	5,647
Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	[1]	0	0
Operating Income (Loss)		$ (5,184)	$ (4,360)
[1] There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.

Net Sales (Details)

Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 331,403	$ 328,028
United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	269,940	280,189
Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	23,972	16,323
Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	14,505	15,282
Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	12,232	10,355
Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	8,803	4,136
Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,951	1,743
Vehicle Control [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	185,524	184,577
Vehicle Control [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	164,821	166,412
Vehicle Control [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	9,158	8,330
Vehicle Control [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	283	198
Vehicle Control [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	10,020	8,587
Vehicle Control [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	101	62
Vehicle Control [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,141	988
Vehicle Control [Member] | Engine Management (Ignition, Emissions and Fuel Delivery) [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	116,085	116,083
Vehicle Control [Member] | Electrical and Safety [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	52,407	51,804
Vehicle Control [Member] | Wire Sets and Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	17,032	16,690
Temperature Control [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	71,608	72,406
Temperature Control [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	64,665	69,571
Temperature Control [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	6,632	2,755
Temperature Control [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	16	0
Temperature Control [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	5	0
Temperature Control [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	141	20
Temperature Control [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	149	60
Temperature Control [Member] | AC System Components [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	49,960	50,798
Temperature Control [Member] | Other Thermal Components [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	21,648	21,608
Engineered Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	74,271	71,045
Engineered Solutions [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	40,454	44,206
Engineered Solutions [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	8,182	5,238
Engineered Solutions [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	14,206	15,084
Engineered Solutions [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	2,207	1,768
Engineered Solutions [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	8,561	4,054
Engineered Solutions [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	661	695
Engineered Solutions [Member] | Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	22,908	20,232
Engineered Solutions [Member] | Construction Agriculture [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	10,076	11,692
Engineered Solutions [Member] | Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	21,803	23,019
Engineered Solutions [Member] | All Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	19,484	16,102
Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0
Other [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0
Other [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0
Other [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0
Other [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0
Other [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0
Other [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 0	$ 0

Commitments and Contingencies,

Commitments and Contingencies, Asbestos and Other Litigation (Details) $ in Thousands	1 Months Ended		3 Months Ended		271 Months Ended
	Sep. 30, 2023 USD ($)	Aug. 31, 2022 USD ($)	Mar. 31, 2024 USD ($) Claim	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Aug. 31, 2023 USD ($)
Asbestos [Abstract]
Accrued asbestos liabilities			$ 68,985		$ 68,985	$ 72,013
Asbestos [Member]
Asbestos [Abstract]
Pending claims, approximate number | Claim			1,460		1,460
Payment for settled claims and awards related damages, including interest					$ 77,700
Increase in range of possible loss from lower range		$ 15,200
Increase in range of possible loss from upper range		$ 23,700
Accrued asbestos liabilities	$ 84,000
Incremental pre-tax provision	$ 23,800
Asbestos [Member] | Minimum [Member]
Asbestos [Abstract]
Range of possible loss							$ 84,000
Asbestos [Member] | Maximum [Member]
Asbestos [Abstract]
Range of possible loss							135,300
Asbestos [Member] | Discontinued Operations [Member]
Asbestos [Abstract]
Total operating cash outflows related to discontinued operations			$ 3,000	$ 2,600
Asbestos [Member] | Discontinued Operations [Member] | Minimum [Member]
Asbestos [Abstract]
Range of possible loss							53,100
Asbestos [Member] | Discontinued Operations [Member] | Maximum [Member]
Asbestos [Abstract]
Range of possible loss							$ 105,200

Commitments and Contingencies_2

Commitments and Contingencies, Warranties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Changes in product warranties [Roll forward]
Balance, beginning of period	$ 21,134	$ 19,667
Liabilities accrued for current year sales	28,677	25,793
Settlements of warranty claims	(26,719)	(24,860)
Balance, end of period	$ 23,092	$ 20,600