Standard Motor Products (SMP) 10-K 27 Feb 25 2024 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 25, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-04743
Entity Registrant Name	Standard Motor Products, Inc.
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 544,138,691
Entity Common Stock, Shares Outstanding		21,861,880
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE The information required by Part III of this Report is incorporated herein by reference from the registrant’s definitive proxy statement relating to its annual meeting of stockholders to be held on May 16, 2024.
Entity Central Index Key	0000093389
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2024

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Firm ID	185
Auditor Name	KPMG LLP
Auditor Location	New York, New York

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales		$ 1,463,849	$ 1,358,272	$ 1,371,815
Cost of sales		1,040,528	969,446	989,276
Gross profit		423,321	388,826	382,539
Selling, general and administrative expenses		335,104	293,583	276,626
Restructuring and integration expenses		7,668	2,642	1,891
Other income, net		75	76	113
Operating income		80,624	92,677	104,135
Other non-operating income, net		6,877	2,326	4,814
Interest expense		13,512	13,287	10,617
Earnings from continuing operations before income taxes		73,989	81,716	98,332
Provision for income taxes		19,385	18,368	25,206
Earnings from continuing operations		54,604	63,348	73,126
Loss from discontinued operations, net of income tax benefit of $10,188, $6,216 and $2,975		(26,128)	(28,996)	(17,691)
Net earnings		28,476	34,352	55,435
Net earnings attributable to noncontrolling interest		976	204	84
Net earnings attributable to SMP	[1]	27,500	34,148	55,351
Net earnings (loss) attributable to SMP
Continuing operations		53,628	63,144	73,042
Discontinued operations		(26,128)	(28,996)	(17,691)
Net earnings attributable to SMP	[1]	$ 27,500	$ 34,148	$ 55,351
Basic:
Continuing operations (in dollars per share)		$ 2.46	$ 2.91	$ 3.37
Discontinued operations (in dollars per share)		(1.20)	(1.34)	(0.82)
Net earnings attributable to SMP per common share - Basic (in dollars per share)		1.26	1.57	2.55
Diluted:
Continuing operations (in dollars per share)		2.41	2.85	3.30
Discontinued operations (in dollars per share)		(1.17)	(1.31)	(0.80)
Net earnings attributable to SMP per common share - Diluted (in dollars per share)		1.24	1.54	2.50
Dividends declared per common share (in dollars per share)		$ 1.16	$ 1.16	$ 1.08
Weighted average number of common shares, basic (in shares)		21,801,141	21,716,177	21,683,719
Weighted average number of common shares, diluted (in shares)		22,237,060	22,161,341	22,139,981
[1] Throughout this Form 10-K, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Discontinued operations, income tax benefit	$ 10,188	$ 6,216	$ 2,975

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net earnings	$ 28,476	$ 34,352	$ 55,435
Other comprehensive income (loss), net of tax:
Foreign currency translation	(20,973)	7,447	(8,222)
Cash flow hedges	1,025	(924)	3,823
Postretirement benefit plans	(11)	(13)	(15)
Total other comprehensive income (loss), net of tax	(19,959)	6,510	(4,414)
Total comprehensive income	8,517	40,862	51,021
Comprehensive income (loss) attributable to noncontrolling interest, net of tax:
Net earnings	976	204	84
Foreign currency translation	(101)	14	(113)
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	875	218	(29)
Comprehensive income attributable to SMP	$ 7,642	$ 40,644	$ 51,050

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 44,426	$ 32,526
Accounts receivable, less allowances for discounts and expected credit losses of $5,472 and $8,045 in 2024 and 2023, respectively	210,719	160,282
Inventories	624,913	507,075
Unreturned customer inventories	16,163	18,240
Prepaid expenses and other current assets	25,703	26,100
Total current assets	921,924	744,223
Property, plant and equipment, net	168,735	121,872
Operating lease right-of-use assets	109,899	100,065
Goodwill	241,418	134,729
Customer relationships intangibles, net	210,430	76,017
Other intangibles, net	90,540	16,291
Deferred income taxes	13,199	40,533
Investments in unconsolidated affiliates	24,842	24,050
Other assets	33,139	35,267
Total assets	1,814,126	1,293,047
CURRENT LIABILITIES:
Current portion of revolving credit facility	10,800	0
Current portion of term loan and other debt	16,317	5,029
Accounts payable	148,009	107,455
Sundry payables and accrued expenses	84,936	63,303
Accrued customer returns	46,471	38,238
Accrued core liability	12,807	18,399
Accrued rebates	76,168	42,278
Payroll and commissions	40,964	29,561
Total current liabilities	436,472	304,263
Long-term debt	535,197	151,182
Noncurrent operating lease liabilities	98,214	88,974
Other accrued liabilities	29,593	25,742
Accrued asbestos liabilities	84,568	72,013
Total liabilities	1,184,044	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	100,135	101,751
Retained earnings	575,385	573,226
Accumulated other comprehensive income	(25,832)	(5,974)
Treasury stock - at cost (2,077,877 shares and 2,018,982 shares in 2024 and 2023, respectively)	(81,815)	(81,811)
Total SMP stockholders’ equity	615,745	635,064
Noncontrolling interest	14,337	15,809
Total stockholders’ equity	630,082	650,873
Total liabilities and stockholders’ equity	$ 1,814,126	$ 1,293,047

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
CURRENT ASSETS:
Accounts receivable, less allowances for discounts and expected credit losses	$ 5,472	$ 8,045
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)	2,077,877	2,018,982

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 28,476	$ 34,352	$ 55,435
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	31,413	29,022	28,298
Amortization of deferred financing cost	1,911	491	421
Increase (decrease) to allowance for expected credit losses	732	2,943	(757)
Increase to inventory reserves	4,155	3,068	6,035
Customer bankruptcy charge	0	0	7,002
Equity income from joint ventures	(4,274)	(2,070)	(3,464)
Employee stock ownership plan allocation	2,787	2,966	2,296
Stock-based compensation	6,127	6,598	8,178
(Increase) in deferred income taxes	(9,996)	(6,952)	(713)
Increase in tax valuation allowance	770	674	1,068
Loss on discontinued operations, net of tax	26,128	28,996	17,691
Change in assets and liabilities:
(Increase) decrease in accounts receivable	(8,753)	7,965	6,916
(Increase) decrease in inventories	(36,883)	29,494	(67,495)
(Increase) decrease in prepaid expenses and other current assets	856	(70)	(5,509)
Increase (decrease) in accounts payable	8,166	19,645	(48,604)
Increase (decrease) in sundry payables and accrued expenses	24,170	(4,284)	(29,089)
Net changes in other assets and liabilities	908	(8,578)	(5,242)
Net cash provided by (used in) operating activities	76,693	144,260	(27,533)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of and investments in businesses	(372,491)	(3,954)	(1,934)
Cash acquired in acquisitions	0	6,779	0
Capital expenditures	(44,018)	(28,633)	(25,956)
Other investing activities	(2,174)	108	73
Net cash used in investing activities	(418,683)	(25,700)	(27,817)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under term loans	211,457	0	100,000
Repayments of term loans	(93)	(5,000)	(2,500)
Net borrowings (repayments) under revolving credit facilities	180,671	(78,500)	16,702
Net borrowings (repayments) of other debt and lease obligations	595	(58)	(2,895)
Purchase of treasury stock	(10,428)	0	(29,656)
Payments of debt issuance costs	(5,133)	0	(2,128)
Increase (decrease) in overdraft balances	166	(189)	(595)
Dividends paid	(25,341)	(25,164)	(23,428)
Dividends paid to noncontrolling interest	(2,347)	(700)	0
Net cash provided by (used in) financing activities	349,547	(109,611)	55,500
Effect of exchange rate changes on cash	4,343	2,427	(755)
Net increase (decrease) in cash and cash equivalents	11,900	11,376	(605)
CASH AND CASH EQUIVALENTS at beginning of year	32,526	21,150	21,755
CASH AND CASH EQUIVALENTS at end of year	44,426	32,526	21,150
Cash paid during the year for:
Interest	14,044	14,597	9,892
Income taxes	$ 19,841	$ 16,019	$ 25,015

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total SMP	Non- controlling Interest
Balance at beginning of period at Dec. 31, 2021	$ 612,627	$ 47,872	$ 105,377	$ 532,319	$ (8,169)	$ (75,819)	$ 601,580	$ 11,047
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	55,435			55,351			55,351	84
Other comprehensive loss, net of tax	(4,414)				(4,301)		(4,301)	(113)
Cash dividends paid	(23,428)			(23,428)			(23,428)
Purchase of treasury stock	(29,656)					(29,656)	(29,656)
Stock-based compensation	8,178		(131)			8,309	8,178
Employee Stock Ownership Plan	2,296		369			1,927	2,296
Balance at end of period at Dec. 31, 2022	621,038	47,872	105,615	564,242	(12,470)	(95,239)	610,020	11,018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interest in step acquisition	5,273							5,273
Net earnings	34,352			34,148			34,148	204
Other comprehensive loss, net of tax	6,510				6,496		6,496	14
Cash dividends paid	(25,164)			(25,164)			(25,164)
Dividends paid to noncontrolling interest	(700)							(700)
Stock-based compensation	6,598		(3,880)			10,478	6,598
Employee Stock Ownership Plan	2,966		16			2,950	2,966
Balance at end of period at Dec. 31, 2023	650,873	47,872	101,751	573,226	(5,974)	(81,811)	635,064	15,809
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	28,476			27,500			27,500	976
Other comprehensive loss, net of tax	(19,959)				(19,858)		(19,858)	(101)
Cash dividends paid	(25,341)			(25,341)			(25,341)
Purchase of treasury stock	(10,428)					(10,428)	(10,428)
Dividends paid to noncontrolling interest	(2,347)							(2,347)
Stock-based compensation	6,021		(1,619)			7,640	6,021
Employee Stock Ownership Plan	2,787		3			2,784	2,787
Balance at end of period at Dec. 31, 2024	$ 630,082	$ 47,872	$ 100,135	$ 575,385	$ (25,832)	$ (81,815)	$ 615,745	$ 14,337

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation & Basis of Presentation Stan dard 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 three segments, Vehicle Control, Temperature Control and Nissens Automotive, 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. In addition to our legacy SMP business, we acquired European automotive aftermarket parts supplier AX V Nissens III ApS (now known as SMP Nissens III ApS) and its direct and indirect subsidiaries (“Nissens Automotive”) in a transaction which closed on November 1, 2024. Nissens Automotive develops, manufactures and markets products within the areas of engine cooling, air conditioning climate systems, and engine efficiency within the automotive aftermarket industry, primarily in Europe. Nissens Automotive will serve as our fourth business segment. For further information and disclosures regarding the Nissens Automotive acquisition, refer to Note 2, "Business Combinations." These consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") an d include our accounts and all domestic and international companies that we control. In addition, we use the equity method, to include our share of the results of certain affiliates based on our economic interest, our ability to exercise significant influence over the operating or financial decisions of these affiliates or our ability to direct their economic resources. We do not control these affiliates, as our ownership in these other affiliates is generally 50% or less. All significant inter-company items have been eliminated. Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2024 presentation. Use of Estimates 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. Reportable Segments Our business comprises of four operating segments – Vehicle Control, Temperature Control and Engineered Solutions from our legacy SMP business and a fourth operating segment, Nissens Automotive, which was created in the fourth quarter of 2024 as a result of our acquisition of Nissens Automotive. Our operating segment structure aligns our operations with our strategic focus on diversifying our business, provides greater transparency into our positioning to capture opportunities for growth in the future, and provides clarity regarding the unique dynamics and margin profiles of the markets served by each segment. Cash and Cash Equivalents We consider all highly liquid investments purchased with a maturity of three months or less to be cash equivalents. Allowance for Expected Credit Losses and Cash Discounts We do not generally require collateral for our trade accounts receivable. Accounts receivable have been reduced by an allowance for amounts that may become uncollectible in the future. These allowances are established based on a combination of write-off history, supportable forecasts, aging analysis, and specific account evaluations. When a receivable balance is known to be uncollectible, it is written off against the allowance for expected credit losses. Cash discounts are provided based on an overall average experience rate applied to qualifying accounts receivable balances. Inventories Inventories are valued at the lower of cost and net realizable value. Cost is determined on the first-in first-out basis. Where appropriate, standard cost systems are utilized for purposes of determining cost; the standards are adjusted as necessary to ensure they approximate actual costs. Estimates of lower of cost and net realizable value of inventory are determined by comparing the actual cost of the product to the estimated selling prices in the ordinary course of business less reasonably predictable costs of completion, disposal and transportation of the inventory. We also evaluate inventories on a regular basis to identify inventory on hand that may be obsolete or in excess of current and future projected market demand. For inventory deemed to be obsolete, we provide a reserve on the full value of the inventory. Inventory that is in excess of current and projected use is reduced by an allowance to a level that approximates our estimate of future demand. Future projected demand requires management judgment and is based upon (a) our review of historical trends and (b) our estimate of projected customer specific buying patterns and trends in the industry and markets in which we do business. Using rolling twelve month historical information, we estimate future demand on a continuous basis. The historical volatility of such estimates has been minimal. We maintain provisions for inventory reserves of $43.7 million and $42.9 million as of December 31, 2024 and 2023, respectively. We utilize cores (used parts) in our remanufacturing processes for air conditioning compressors, diesel injectors, and diesel pumps. The production of air conditioning compressors, diesel injectors, and diesel pumps involves the rebuilding of used cores, which we acquire either in outright purchases from used parts brokers, or from returns pursuant to an exchange program with customers. Under such exchange programs, at the time of sale of air conditioning compressors, diesel injectors, and diesel pumps, we estimate the core expected to be returned from the customer and record the estimated return as unreturned customer inventory. In addition, many of our customers can return inventory to us based upon customer warranty and overstock arrangements within customer specific limits. At the time products are sold, we accrue a liability for product warranties and overstock returns and record an asset for unreturned customer inventory based on our estimate of anticipated customer returns. Estimates are based upon historical information on the nature, frequency and probability of the customer return. Unreturned core, warranty and overstock customer inventory is recorded at standard cost. Revision to these estimates is made when necessary, based upon changes in these factors. We regularly study trends of such claims. Property, Plant and Equipment Property, plant and equipment are recorded at historical cost and are depreciated using the straight-line method of depreciation over the estimated useful lives as follows: Estimated Life Buildings 25 to 33-1/2 years Building improvements 10 to 25 years Machinery and equipment 5 to 12 years Tools, dies and auxiliary equipment 3 to 8 years Furniture and fixtures 3 to 12 years Leasehold improvements are depreciated over the shorter of the estimated useful life or the term of the lease. Costs related to maintenance and repairs which do not prolong the assets useful lives are expensed as incurred. We assess our property, plant and equipment to be held and used for impairment when indicators are present that the carrying value may not be recoverable. Leases We determine if an arrangement is a lease at inception. For operating leases, we include and report operating lease right-of-use (“ROU”) assets, sundry payables and accrued expenses, and noncurrent operating lease liabilities on our consolidated balance sheet for leases with a term longer than twelve months. Finance leases are reported on our consolidated balance sheets in property, plant and equipment, current portion of other debt, and long-term debt. Operating lease ROU assets and operating lease liabilities are recognized at the lease commencement date based on the present value of the total lease payments over the lease term. Our ROU assets represent the right to use an underlying leased asset over the existing lease term, and the corresponding lease liabilities represent our obligation to make lease payments arising from the lease agreement. As most of our leases do not provide for an implicit rate, we use our incremental borrowing rate based on the information available when determining the present value of our lease payments. Our lease terms may include options to terminate, or extend, our lease when it is reasonably certain that we will execute the option. Lease agreements may contain lease and non-lease components, which are generally accounted for separately. Operating lease expense is recognized on a straight-line basis over the lease term. Business Combinations and Intangible Assets Including Goodwill The company accounts for business combinations using the acquisition method and accordingly, the identifiable assets acquired, the liabilities assumed, and any noncontrolling interest in the acquiree are generally recorded at their acquisition date fair values. At acquisition, we estimate and record the fair value of purchased intangible assets, which primarily consist of customer relationships, trademarks and trade names, and patents, developed technology and intellectual property. Intangible assets acquired through business combinations are subject to potential adjustments within the measurement period, which is up to one year from the acquisition date. Valuing intangible assets requires the use of significant estimates and assumptions. Significant estimates and assumptions used in valuing customer relationships include but are not limited to: (i) forecasted revenues attributable to existing customers; (ii) forecasted margins; (iii) customer attrition rates; and (iv) the discount rate. Identifiable intangible assets with finite lives are amortized over their useful lives generally on a straight-line basis. Goodwill is the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. The primary drivers that generate goodwill are the value of synergies between the acquired entities and the company and the acquired assembled workforce, neither of which qualifies as a separately identifiable intangible asset. Goodwill and certain other intangible assets having indefinite lives are not amortized to earnings, but instead are subject to periodic testing for impairment. Intangible assets determined to have definite lives are amortized over their remaining useful lives. We believe that the fair value of acquired identifiable net assets, including intangible assets, are based upon reasonable estimates and assumptions. Acquisition related costs, including advisory, legal, accounting, valuation and pre-close and other costs, are typically expensed in the periods in which the costs are incurred and are recorded in selling, general and administrative expenses within the statement of operations. The results of operations of acquired businesses are included in the Consolidated Financial Statements from the acquisition date. Impairment We assess long‑lived assets, identifiable intangible assets and goodwill for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. With respect to goodwill and identifiable intangible assets having indefinite lives, we test for impairment on an annual basis or in interim periods if an event occurs or circumstances change that may indicate the fair value is below its carrying amount. Factors we consider important, which could trigger an impairment review, include the following: (a) significant underperformance relative to expected historical or projected future operating results; (b) significant changes in the manner of our use of the acquired assets or the strategy for our overall business; and (c) significant negative industry or economic trends. We review the fair values using the discounted cash flows method and market multiples. When performing our evaluation of goodwill for impairment, if we conclude qualitatively that it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then a quantitative impairment test would not be required. If we are unable to reach this conclusion, then we would perform a quantitative impairment test. In performing the quantitative impairment test, the fair value of the reporting unit is compared to its carrying amount. A charge for impairment is recognized by the amount by which the reporting unit’s carrying amount exceeds its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. Identifiable intangible assets having indefinite lives are reviewed for impairment on an annual basis using a methodology similar with that used to evaluate goodwill. Intangible assets having definite lives and other long-lived assets are reviewed for impairment whenever events such as product discontinuance, plant closures, product dispositions or other changes in circumstances indicate that the carrying amount may not be recoverable. In reviewing intangible assets having definite lives and other long-lived assets for impairment, we compare the carrying value of such assets to the estimated undiscounted future cash flows expected from the use of the assets and their eventual disposition. When the estimated undiscounted future cash flows are less than their carrying amount, an impairment loss is recognized equal to the difference between the assets fair value and their carrying value. There are inherent assumptions and estimates used in developing future cash flows requiring our judgment in applying these assumptions and estimates to the analysis of identifiable intangibles and long‑lived asset impairment including projecting revenues, interest rates, tax rates and the cost of capital. Many of the factors used in assessing fair value are outside our control and it is reasonably likely that assumptions and estimates will change in future periods. These changes can result in future impairments. In the event our planning assumptions were modified resulting in impairment to our assets, we would be required to include an expense in our statement of operations, which could materially impact our business, financial condition and results of operations. Foreign Currency Translation Assets and liabilities of our foreign operations are translated into U.S. dollars at year-end exchange rates. Income statement accounts are translated using the average exchange rates prevailing during the year. The resulting translation adjustments are recorded as a separate component of accumulated other comprehensive income (loss) and remain there until the underlying foreign operation is liquidated or substantially disposed of. Foreign currency transaction gains or losses are recorded in other non-operating income (expense), net in our statement of operations. Revenue Recognition We derive our revenue primarily from vehicle aftermarket sales in our Vehicle Control, Temperature Control and Nissens Automotive segments, and non-aftermarket sales in our Engineered Solutions Segment. We recognize revenues when our performance obligation has been satisfied and the control of products has been transferred to a customer which typically occurs upon shipment. Revenue is measured as the amount of consideration we expect to receive in exchange for the transfer of goods or provision of services. The amount of consideration we receive and revenue we recognize depends on the marketing incentives, product warranty and overstock returns we offer to our customers. For certain of our sales of remanufactured products, we also charge our customers a deposit for the return of a used core component which we can use in our future remanufacturing activities. Such deposit is not recognized as revenue at the time of the sale but rather carried as a core liability. At the same time, we estimate the core expected to be returned from the customer and record the estimated return as unreturned customer inventory. The liability is extinguished when a core is actually returned to us, or at period end when we estimate and recognize revenue for the core deposits not expected to be returned. We estimate and record provisions for cash discounts, quantity rebates, sales returns and warranties in the period the sale is recorded, based upon our prior experience and current trends. Significant management judgments and estimates are made in estimating sales returns and allowances relating to revenue recognized in any accounting period. Product Warranty and Overstock Returns Many of our products carry a warranty ranging from a 90-day limited warranty to a lifetime limited warranty, which generally covers defects in materials or workmanship and failure to meet industry published specifications and/or the result of installation error. In addition to warranty returns, we also permit our customers to return new, undamaged products to us within customer-specific limits (which are generally limited to a specified percentage of their annual purchases from us) in the event that they have overstocked their inventories. At the time products are sold, we accrue a liability for product warranties and overstock returns as a percentage of sales based upon estimates established using historical information on the nature, frequency and average cost of the claim and the probability of the customer return. At the same time, we record an estimate of anticipated customer returns as unreturned customer inventory. Significant judgments and estimates are made in connection with establishing the sales returns and other allowances in any accounting period. Revision to these estimates is made when necessary, based upon changes in these factors. We regularly study trends of such claims. New Customer Acquisition Costs New customer acquisition costs refer to arrangements pursuant to which we incur change-over costs to induce a new customer to switch from a competitor’s brand. In addition, change-over costs include the costs related to removing the new customer’s inventory and replacing it with our inventory commonly referred to as a stock lift. New customer acquisition costs are recorded as a reduction to revenue when incurred. Selling, General and Administration Expenses Selling, general and administration expenses include shipping costs and advertising, which are expensed as incurred. Shipping and handling charges, as well as freight to customers, are included in distribution expenses as part of selling, general and administration expenses. Accounting for Income Taxes Income taxes are calculated using the asset and liability method. Deferred tax assets and liabilities are determined based on the estimated future tax effects of temporary differences between the financial statement carrying amounts and the tax bases of assets and liabilities, as measured by the current enacted tax rates. We maintain valuation allowances when it is more likely than not that all or a portion of a deferred asset will not be realized. In determining whether a valuation allowance is warranted, we consider all positive and negative evidence and all sources of taxable income such as prior earnings history, expected future earnings, carryback and carryforward periods and tax strategies to estimate if sufficient future taxable income will be generated to realize the deferred tax asset. The assessment of the adequacy of our valuation allowance is based on our estimates of taxable income by jurisdiction in which we operate and the period over which our deferred tax assets will be recoverable. In the event that actual results differ from these estimates, or we adjust these estimates in future periods for current trends or expected changes in our estimating assumptions, we may need to modify the level of valuation allowance which could materially impact our business, financial condition and results of operations. Tax benefits are recognized for an uncertain tax position when, in management’s judgment, it is more likely than not that the position will be sustained upon examination by a taxing authority. For a tax position that meets the more-likely-than-not recognition threshold, the tax benefit is measured as the largest amount that is judged to have a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority. The liability associated with unrecognized tax benefits is adjusted periodically due to changing circumstances and when new information becomes available. Such adjustments are recognized entirely in the period in which they are identified. Asbestos Litigation 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: (i) historical data available from publicly available studies; (ii) an analysis of our recent claims history to estimate likely filing rates into the future; (iii) an analysis of our currently pending claims; (iv) an analysis of our settlements and awards of asbestos-related damages to date; and (v) 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. Future legal costs are expensed as incurred and reported in earnings (loss) from discontinued operations in the accompanying statement of operations. 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. Loss Contingencies We have loss contingencies, for such matters as legal claims and legal proceedings. Establishing loss reserves for these matters requires estimates, judgment of risk exposure and ultimate liability. We record provisions when the liability is considered probable and reasonably estimable. Significant judgment is required for both the determination of probability and the determination as to whether an exposure can be reasonably estimated. We maintain an ongoing monitoring and identification process to assess how the activities are progressing against the accrued estimated costs. As additional information becomes available, we reassess our potential liability related to these matters. Adjustments to the liabilities are recorded in the statement of operations in the period when additional information becomes available. Such revisions of the potential liabilities could have a material adverse effect on our business, financial condition or results of operations. Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash investments, accounts receivable and derivative financial instruments used to reduce our market risk for changes in interest rates on our variable rate borrowings. We place our cash investments with high quality financial institutions and limit the amount of credit exposure to any one institution. Derivative financial instruments used to reduce our market risk for changes in interest rates on our variable rate borrowings are entered into with high quality financial institutions, with their credit worthiness reviewed on a quarterly basis. Although we are directly affected by developments in the vehicle parts industry, management does not believe significant credit risk exists. With respect to accounts receivable, such receivables are primarily from warehouse distributors and major retailers in the automotive aftermarket industry located in the U.S. We perform ongoing credit evaluations of our customers’ financial conditions. A significant portion of our net sales are concentrated from our three largest individual customers. The loss of one or more of these customers or, a significant reduction in purchases of our products from any one of them, could have a materially adverse impact on our business, financial condition and results of operations. For further information on net sales to our three largest customers and our concentration our customer risk, see Note 21, “Industry Segment and Geographic Data.” Foreign Cash Balances Substantially all of the cash and cash equivalents, including foreign cash balances, at December 31, 2024 and 2023 were uninsured. Foreign cash balances at December 31, 2024 and 2023 were $42.5 million and $30.5 million , respectively. Derivative Instruments and Hedging Activities We occasionally use derivative financial instruments to reduce our market risk for changes in interest rates on our variable rate borrowings. Derivative financial instruments are recorded at fair value in other current and long-term assets, and other current and long-term liabilities in the consolidated balance sheets. For derivative financial instruments that have been formally designated as cash flow hedges, provided that the hedging instrument is highly effective, the entire change in the fair value of the derivative will be deferred and recorded in accumulated other comprehensive income (“AOCI”) in the consolidated balance sheets. When the underlying hedged transaction is realized (i.e., when the interest payments on the underlying borrowing are recognized in the consolidated statements of operations), the gain/loss included in AOCI is recorded in earnings and reflected on the same line as the gain/loss on the hedged item attributable to the hedged risk (i.e., interest expense for cash flow hedges of interest rate risk). At the inception of each transaction, we formally document the hedge relationship, including the identification of the hedge instrument, the related hedged items, the effectiveness of the hedge, as well as its risk management objectives and strategies. Recently Adopted Accounting Pronouncements ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the Financial Accounting Standards Board (FASB) issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This accounting standards update improves segment disclosure requirements, primarily through expanding the disclosures to include significant segment expenses incurred by the business. To achieve these disclosures the following items are required by ASU 2023-07: (i) 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; (ii) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (iii) 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. This ASU is effective for fiscal years beginning after December 15, 2023 and as such we have expanded our disclosures in Note 21, "Industry Segment and Geographic Data ," of the notes to our consolidated financial statements and recast comparative periods . Standards that are not yet adopted as of December 31, 2024 ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures. This accounting standards update will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required income effective tax rate reconciliation disclosures to include disclosure of (i) eight specific categories of rate reconciling items; (ii) additional information for reconciling items that meet or exceed a quantitative threshold; and (iii) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, ASU 2023-09 will expand required interim and annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions, with expanded disclosures required annually. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is January 1, 2025, with full retrospective application required to all prior periods presented. Early adoption is permitted. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. We will adopt the guidance when it becomes effective. ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40) In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40). This accounting standards update seeks to provide investors and users of the financial statements with clearer information regarding companies' cost structures by disaggregating expense line items in the income statement. ASU 2024-03 requi

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Business Combinations	Business Combinations Acquisition of Nissens Automotive On November 1, 2024, we acquired all the issued and outstanding shares of European automotive aftermarket parts supplier, AX V Nissens III ApS (now known as SMP Nissens III ApS) and its direct and indirect subsidiaries (“Nissens Automotive”) for €366.8 million (approximately $397.1 million), the purchase price consideration, from Nordic private equity firm, Axcel V K/S, and the Nissen family. The acquired Nissens Automotive business was paid for with cash funded by borrowing from our revolving credit facility and term loans, under the 2024 Credit Agreement. The acquisition of Nissens Automotive, a leading European supplier of thermal management and engine efficiency products for the automotive aftermarket, aligns with our strategy to become an aftermarket leader in North America and Europe across our key product categories. Through this acquisition, we will take advantage of collaboration for growth through cross-selling opportunities as well as bi-directional synergies with significant savings potential. The Nissens Automotive operating segment was created in the fourth quarter as a result of the acquisition. As of February 27, 2025, the purchase price allocation is considered preliminary and was based upon a preliminary valuation. The primary areas of the preliminary purchase price allocation that are not yet finalized relate to the valuation of identifiable intangible assets acquired. We determined the fair value of acquired intangible assets using the multi-period excess earnings method and the relief-from-royalty method under the income approach for customer relationships and trade names, respectively. These methods generally forecast expected future net cash flows discretely associated with each of the identified intangible assets and adjust the forecasts to present value by applying a discount rate intended to reflect risk factors associated with the cash flows and the time value of money. In addition to the consideration transferred to complete the transaction, we incurred closing and other acquisition related costs of $8 million recorded as selling, general and administrative costs within the statement of operations during the year ended December 31, 2024. The following table summarizes the allocation of the acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (a) $ 397,111 Cash and cash equivalents 24,620 Accounts receivable 48,460 Inventories 88,337 Unreturned customer inventories 1,820 Prepaid expenses and other current assets 1,033 Property, plant and equipment 29,048 Operating lease right-of-use assets 8,625 Customer relationships intangibles (c) 150,400 Other intangibles (c) 78,871 Other assets 407 Total assets acquired 431,621 Current portion of term loan and other debt 1,749 Accounts payable 34,568 Sundry payables and accrued expenses 19,836 Accrued customer returns 3,360 Accrued rebates 24,732 Payroll and commissions 3,294 Long-term debt 14,423 Noncurrent operating lease liabilities 5,501 Other accrued liabilities 1,371 Deferred tax liabilities 37,870 Total liabilities assumed 146,704 Net assets acquired 284,917 Goodwill (b) $ 112,194 (a) Total purchase consideration is the cash paid of $397.1 million for the acquisition. (b) Goodwill is deductible for tax purposes (c) Intangible assets comprise of capitalized computer software of $2.2 million and the following preliminary valuation of identifiable intangible assets (in thousands): Gross Carrying Amount Weighted-Average Useful Life (in Years) Customer relationships $ 150,400 16 Trade names - Nissens & AVA 75,600 Indefinite Trade names - Highway 1,100 15 Other intangibles $ 227,100 Unaudited Supplemental Pro Forma Financial Information The following unaudited supplemental pro forma information presents the combined results of operations for the years ended December 31, 2024 and 2023, respectively, as if the Nissens Automotive acquisition was completed on January 1, 2023. The pro forma financial information presented below is for illustrative purposes and is not indicative of the operating results that would have been realized if the acquisition had been completed on January 1, 2023, nor is it indicative of future operating results (in thousands): Year Ended December 31, 2024 2023 Net sales $ 1,704,858 $ 1,615,110 Net earnings attributable to SMP 39,907 18,870 The unaudited supplemental pro forma financial information includes adjustments for (i) amortization and depreciation totaling $3.4 million and $4.1 million for the years ended December 31, 2024 and 2023, respectively, that would have been recognized for the acquired intangible assets and the fair value adjustment of property, plant and equipment; (ii) amortization expense for deferred financing costs of $14.5 million and $18.2 million for the years ended December 31, 2024 and 2023, respectively and (iii) the estimated income tax benefit on the unaudited pro forma financial adjustments. The unaudited supplemental pro forma financial information assumes that the following were incurred during the year ended December 31, 2023: (i) $9.4 million for amortization of the inventory fair-value adjustment, (ii) $1.6 million for acquisition related transaction costs, (iii) $1.8 million for employee retention bonus expense and (iv) the related estimated income tax benefits. The pro forma financial information does not reflect any expected revenue or cost synergies. Increase in Equity Investment - Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (2023) In July 2023, we acquired an additional 15% equity interest in our 65% owned joint venture, Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (“Gwo Yng”), for Chinese renminbi ("RMB") 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 Inventories 5,945 Other current assets 528 Property, plant and equipment 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 that will be amortized on a straight-line basis over the estimated useful life of 10 years and capitalized software of $0.1 million. 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.

Restructuring and Integration E

Restructuring and Integration Expenses	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring and Integration Expenses	Restructuring and Integration Expenses Separation Program During the second quarter of 2024 we offered a voluntary retirement incentive package of severance and other benefit enhancements to eligible employees in the United States and Canada as part of our commitment to optimizing our cost structure and providing professional development opportunities to our employees. The offer period ended on June 14, 2024. During the third quarter of 2024, we expanded the program to include involuntary separations. Costs primarily comprise of compensation expense and enhanced medical benefits, and are charged to restructuring and integration expenses in our statement of operations as a one-time termination benefit. Voluntary retirement incentive costs were recognized when the employee accepted the offer or are being recognized over their remaining period of service based on the agreed retirement date. We anticipate that the program will be substantially complete by the end of 2027. Additional pre-tax restructuring costs related to the program are expected to be $0.6 million in 2025, $0.1 million in 2026 and an immaterial amount in 2027 for an aggregate cost of approximately $7.7 million. Activity for year ended December 31, 2024 related to the separation program workforce reduction consisted of the following (in thousands): Exit activity liability at December 31, 2023 $ — Restructuring and integration costs: Amounts provided for during 2024 (a) 7,116 Cash payments (2,485) Stock-based compensation 150 Foreign currency translation (5) Exit activity liability at December 31, 2024 $ 4,776 (a) Restructuring and integration expenses incurred during the year ended December 31, 2024 consist of $3.8 million in our Vehicle Control segment, $0.8 million in our Temperature Control segment, $0.8 million in our Engineered Solutions segment and $1.7 million in our Other segment. 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. The cumulative restructuring expenses incurred to date for the program are $4.6 million. We anticipate that the Cost Reduction Initiative will be substantially completed by the end of 2026. Additional restructuring costs related to the initiative are expected to be immaterial. Activity for the year ended ended December 31, 2024 related to the cost reduction initiative consisted of the following (in thousands): Workforce Reduction Other Exit Costs Total Exit activity liability at December 31, 2022 $ 1,521 $ — $ 1,521 Restructuring and integration costs: Amounts provided for during 2023 (a) 1,973 669 2,642 Cash payments (a) (1,803) (577) (2,380) Reclassification of environmental liability — (92) (92) Foreign currency translation 38 — 38 Exit activity liability at December 31, 2023 $ 1,729 $ — $ 1,729 Restructuring and integration costs: Amounts provided for during 2024 (b) 163 389 552 Cash payments (1,632) (389) (2,021) Foreign currency translation (28) — (28) Exit activity liability at December 31, 2024 $ 232 $ — $ 232 (a) Includes $0.1 million of integration expenses recognized and cash payments made for the Particulate Matter Sensor Product Line Relocation program related to the relocation of inventory and equipment in connection with the 2021 acquisitions of certain product lines. The program was completed in 2022. (b) Restructuring and integration expenses incurred during the year ended December 31, 2024 consist of $0.4 million in our Vehicle Control segment, $0.1 million in our Temperature Control segment and an immaterial amount in our Engineered Solutions segment. Restructuring and integration activities are included within "sundry payables and accrued expenses" and "other current liabilities" in the consolidated balance sheet.

Sale of Receivables

Sale of Receivables	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Sale of Receivables	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 $884.7 million and $830.8 million of receivables for the years ended December 31, 2024 and 2023, respectively. Receivables presented at financial institutions and not yet collected as of December 31, 2024 and December 31, 2023 were approximately $5.8 million and $4.5 million, respectively, and remained in our accounts receivable balance for those periods. All receivables sold were reflected as a reduction of accounts receivable in the consolidated balance sheet at the time of sale. A charge in the amount of $48.5 million , $46 million and $32 million related to the sale of receivables is included in selling, general and administrative expenses in our consolidated statements of operations for the years ended December 31, 2024, 2023 and 2022, respectively. 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, delays or failures in collecting trade accounts receivables. 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	12 Months Ended
	Dec. 31, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories December 31, (In thousands) 2024 2023 Finished goods $ 394,852 $ 302,557 Work-in-process 22,053 18,503 Raw materials 208,008 186,015 Subtotal 624,913 507,075 Unreturned customer inventories 16,163 18,240 Total inventories $ 641,076 $ 525,315

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment December 31, (In thousands) 2024 2023 Land, buildings and improvements $ 68,356 $ 45,710 Machinery and equipment 186,902 177,337 Tools, dies and auxiliary equipment 78,934 73,494 Furniture and fixtures 37,400 33,212 Leasehold improvements 18,991 16,418 Construction-in-progress 51,416 35,357 Total property, plant and equipment 441,999 381,528 Less accumulated depreciation 273,264 259,656 Total property, plant and equipment, net $ 168,735 $ 121,872 Depreciation expense was $20.6 million in 2024 , $19.7 million in 2023 and $19 million

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Leases	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. We have not included any of the renewal options in our operating lease payments, as we concluded that it is not reasonably certain that we will exercise any of these 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 the acquisition (in thousands, except where otherwise indicated): Year Ended December 31, Balance Sheet Information 2024 2023 Assets Operating lease right-of-use assets $ 109,899 $ 100,065 Liabilities Sundry payables and accrued expenses $ 19,992 $ 17,139 Noncurrent operating lease liabilities 98,214 88,974 Total operating lease liabilities $ 118,206 $ 106,113 Weighted Average Remaining Lease Term 7.7 years 8.3 years Weighted Average Discount Rate 5.0 % 4.8% Year Ended December 31, 2024 2023 Lease Expense Operating lease expense $ 19,993 $ 16,434 Variable and other lease expense (a) 3,907 3,272 Total lease costs $ 23,900 $ 19,706 (a) Variable and other lease expense relate 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 are not material. Year Ended December 31, 2024 2023 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities $ 18,365 $ 12,099 Right-of-use assets obtained in exchange for new lease obligations (a) $ 17,873 $ 66,014 (a) During the year ended December 31, 2024 includes $4.7 million of right-of-use assets related to the lease modification and extension for our manufacturing facility in Bialystok, Poland and $10.8 million of right-of-use assets related to the new lease agreement for our manufacturing facility in Reynosa, Mexico. Minimum Lease Payments At December 31, 2024, we are obligated to make minimum lease payments through 2034 , under operating leases, which are as follows (in thousands): 2025 $ 20,889 2026 19,169 2027 16,906 2028 14,579 2029 13,990 Thereafter 59,220 Total lease payments 144,753 Less: Interest (26,547) Present value of lease liabilities $ 118,206
Leases	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. We have not included any of the renewal options in our operating lease payments, as we concluded that it is not reasonably certain that we will exercise any of these 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 the acquisition (in thousands, except where otherwise indicated): Year Ended December 31, Balance Sheet Information 2024 2023 Assets Operating lease right-of-use assets $ 109,899 $ 100,065 Liabilities Sundry payables and accrued expenses $ 19,992 $ 17,139 Noncurrent operating lease liabilities 98,214 88,974 Total operating lease liabilities $ 118,206 $ 106,113 Weighted Average Remaining Lease Term 7.7 years 8.3 years Weighted Average Discount Rate 5.0 % 4.8% Year Ended December 31, 2024 2023 Lease Expense Operating lease expense $ 19,993 $ 16,434 Variable and other lease expense (a) 3,907 3,272 Total lease costs $ 23,900 $ 19,706 (a) Variable and other lease expense relate 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 are not material. Year Ended December 31, 2024 2023 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities $ 18,365 $ 12,099 Right-of-use assets obtained in exchange for new lease obligations (a) $ 17,873 $ 66,014 (a) During the year ended December 31, 2024 includes $4.7 million of right-of-use assets related to the lease modification and extension for our manufacturing facility in Bialystok, Poland and $10.8 million of right-of-use assets related to the new lease agreement for our manufacturing facility in Reynosa, Mexico. Minimum Lease Payments At December 31, 2024, we are obligated to make minimum lease payments through 2034 , under operating leases, which are as follows (in thousands): 2025 $ 20,889 2026 19,169 2027 16,906 2028 14,579 2029 13,990 Thereafter 59,220 Total lease payments 144,753 Less: Interest (26,547) Present value of lease liabilities $ 118,206

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets We completed our annual impairment test of goodwill and indefinite-lived intangible assets as of December 31, 2024. As of December 31, 2024, we qualitatively assessed whether it was more likely than not that the fair value of any of our reporting units was less than carrying value, and concluded that the quantitative impairment test would not be required, and no goodwill impairment charge was required as of December 31, 2024. While we concluded that we did not have a goodwill impairment charge as of December 31, 2024, and we do not believe that future impairments are probable, we will need to maintain the current ongoing performance levels at each of our reporting units in future periods to sustain their goodwill and indefinite-lived intangible assets carrying values. In connection with our operating segment reorganization on January 1, 2023, we reassessed our reporting units and reallocated goodwill from the reporting units that existed prior to the change to the new reporting units, using a relative fair value approach similar to that used when a portion of a reporting unit is to be disposed of. We performed goodwill impairment tests as of January 1, 2023 on both the reporting units in place prior to the change and the new reporting units, and concluded that the estimated fair values of each of the reporting units exceeded their respective carrying amounts and, therefore, no impairment charge was necessary. Goodwill Changes in the carrying values of goodwill by reporting unit during the years ended December 31, 2024 and 2023 are as follows (in thousands): Vehicle Temperature Control Engineered Nissens Automotive Total Balance as of December 31, 2022: Goodwill $ 129,008 $ 11,474 $ 30,093 $ — $ 170,575 Accumulated impairment losses (38,488) — — — (38,488) 90,520 11,474 30,093 — 132,087 Activity in 2023 Step acquisition of Gwo Yng — 1,214 994 — 2,208 Foreign currency translation 286 42 106 — 434 Balance as of December 31, 2023: Goodwill 129,294 12,730 31,193 — 173,217 Accumulated impairment losses (38,488) — — — (38,488) $ 90,806 $ 12,730 $ 31,193 $ — $ 134,729 Activity in 2024 Acquisition of Nissens Automotive — — — 112,194 112,194 Foreign currency translation (384) (62) (144) (4,915) (5,505) Balance as of December 31, 2024: Goodwill $ 128,910 $ 12,668 $ 31,049 $ 107,279 $ 279,906 Accumulated impairment losses (38,488) — — — (38,488) $ 90,422 $ 12,668 $ 31,049 $ 107,279 $ 241,418 Acquired Intangible Assets Acquired identifiable intangible assets as of December 31, 2024 and 2023 consist of (in thousands): December 31, 2024 2023 Customer relationships 303,547 159,641 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 82,220 8,880 Non-compete agreements 3,308 3,295 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets $ 404,158 $ 186,899 Less accumulated amortization(a) (106,304) (95,681) Net acquired intangible assets $ 297,854 $ 91,218 (a) Applies to all intangible assets, except for trademarks/trade names totaling $74.9 million , which have indefinite useful lives and, as such, are not being amortized. Total amortization expense for acquired intangible assets was $10 million for the year ended December 31, 2024, $8.5 million for the year ended December 31, 2023, and $8.6 million for the year ended December 31, 2022. The following table summarizes the amortization expense on our intangible assets and the estimated amortization expenses in future periods based on the current estimated useful lives assigned to our intangible assets (in thousands): Amortization Expense (a) 2025 17,500 2026 17,500 2027 17,500 2028 17,500 2029-2041 153,000 (a) Estimated amortization expenses based on the current estimated useful lives assigned to our intangible assets For information related to identified intangible assets acquired in the Nissens acquisition, see Note 2, “Business Acquisitions and Investments,” of the notes to our consolidated financial statements. Other Intangible Assets Other intangible assets include computer software. Computer software as of December 31, 2024 and 2023 totaled $21.4 million and $19.1 million , respectively. Total accumulated computer software amortization as of December 31, 2024 and 2023 was $18.3 million and $18.0 million , respectively. Computer software is amortized over its estimated useful life of 3 to 10 years . Amortization expense for computer software was $0.8 million , $0.8 million and $0.7 million for the years ended December 31, 2024 , 2023 and 2022 , respectively.

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates	12 Months Ended
	Dec. 31, 2024
Investments in and Advances to Affiliates [Abstract]
Investments in Unconsolidated Affiliates	9. Investments in Unconsolidated Affiliates December 31, (in thousands) 2024 2023 Foshan FGD SMP Automotive Compressor Co. Ltd. $ 19,994 $ 18,426 Foshan Che Yijia New Energy Technology Co., Ltd. 2,401 3,128 Orange Electronic Co. Ltd 2,447 2,496 Total $ 24,842 $ 24,050 Investment in Foshan FGD SMP Automotive Compressor Co. Ltd. In November 2017, we formed Foshan FGD SMP Automotive Compressor Co., Ltd., a 50/50 joint venture with Foshan Guangdong Automotive Air Conditioning Co., Ltd. (“FGD”), a manufacturer of automotive belt driven air conditioning compressors based in China. We acquired our 50% interest in the joint venture for approximately $12.5 million. We determined that due to a lack of a voting majority, and other qualitative factors, we do not control the operations of the joint venture and accordingly, our investment in the joint venture is accounted for under the equity method of accounting. During the years ended December 31, 2024 and 2023, we made purchases from the joint venture of approximately $60 million and $44.1 million, respectively. Investment in Foshan Che Yijia New Energy Technology Co., Ltd. In August 2019, we acquired an approximate 29% minority interest in Foshan Che Yijia New Energy Technology Co., Ltd. (“CYJ”), a manufacturer of automotive electric air conditioning compressors based in China, for approximately $5.1 million. In October 2022, we acquired an additional 3.55% equity interest in CYJ for RMB 1.7 million (approximately $242,000), increasing our interest to approximately 33%. Our minority interest in CYJ is accounted for using the equity method of accounting. During the years ended December 31, 2024 and 2023, purchases we made from CYJ were not material. In December 2021, Standard Motor Products (Hong Kong), Ltd., (“SMP HK”), a subsidiary of Standard Motor Products, Inc., entered into an unsecured loan agreement with CYJ. Under the terms of the loan agreement, CYJ shall have the right to borrow from SMP HK, as lender, up to an aggregate principal amount of $4 million, with interest calculated on the basis of simple interest of five percent (5%) per annum and a maturity date of November 30, 2023, subject to extension by SMP HK at its sole discretion. In September 2023, the loan agreement was extended through November 30, 2025. Outstanding borrowings under the loan agreement at December 31, 2024 were $4.0 million . Investment in Orange Electronic Co. Ltd. In January 2013, we acquired a 19.4% minority interest in Orange Electronic Co., Ltd. (“Orange”), a manufacturer of tire pressure monitoring system sensors based in Taiwan, for $6.3 million. Our minority interest in Orange is accounted for using the equity method of accounting as we have the ability to exercise significant influence. During the years ended December 31, 2024 and 2023, we made purchases from Orange of approximately $1.4 million and $3.2 million, respectively.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2024
Other Assets [Abstract]
Other Assets	10. Other Assets December 31, (in thousands) 2024 2023 Deferred compensation $ 26,333 $ 23,893 Long-term investments 92 7,468 Noncurrent portion of interest rate swap fair value 3,991 1,944 Deferred financing costs, net 1,702 1,125 Other 1,021 837 Total other assets, net $ 33,139 $ 35,267 Deferred compensation consists of assets held in a nonqualified defined contribution pension plan as of December 31, 2024 and 2023, respectively. Long term investments as of December 31, 2024 consist of certificates of deposit with original maturities in excess of twelve months.

Credit Facilities and Long-Term

Credit Facilities and Long-Term Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Credit Facilities and Long-Term Debt	Credit Facilities and Long-Term Debt Total debt outstanding is summarized as follows (in thousands): December 31, 2024 2023 2022 Credit Agreement: Revolver $ — $ 63,500 Term loan — 92,500 2024 Credit Agreement: Multi-currency revolver 244,171 — U.S. dollar term loan(a) 198,287 — Euro term loan(a) 102,908 — Other 16,948 211 Total debt $ 562,314 $ 156,211 Current maturities of debt $ 27,117 $ 5,029 Long-term debt 535,197 151,182 Total debt $ 562,314 $ 156,211 (a) Amounts are shown net of unamortized deferred financing costs of $2.7 million at December 31, 2024. Term Loans and Revolving Credit Facilities In May 2024 and July 2024, the Company amended it's then-existing Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders ("2022 Credit Agreement"), to transition from the Canadian Dollar Offered Rate (“CDOR”) to the Canadian Overnight Repo Rate Average (“CORRA”) for benchmark borrowings denominated in Canadian dollars and to provide for a new $125 million term loan and the use of funds available under the revolving credit facility to finance the acquisition of Nissens Automotive and related transaction costs. For additional information on our agreement to acquire Nissens Automotive see Note 2, “Business Combinations.” In September 2024, the Company refinanced its existing 2022 Credit Agreement with a new five-year Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders (“2024 Credit Agreement”). The 2024 Credit Agreement matures on September 16, 2029 and provides for an approximately $750 million credit facility, comprised of (i) a $430 million multi-currency revolving credit facility ("global tranche"); (ii) a $10 million multi-currency revolving credit facility, available to one or more wholly-owned Danish subsidiaries of the Company ("Danish tranche"); (iii) a $200 million delayed draw term loan facility in U.S. dollars; and (iv) a 100 million euros delayed draw term loan facility. The revolving credit facility has a $25 million sublimit for the issuance of letters of credit, and a $30 million sublimit for the borrowing of swingline loans. Borrowings under the 2024 Credit Agreement were used to repay all outstanding borrowings under the 2022 Credit Agreement and to finance the Company's acquisition of Nissens Automotive and related transaction costs, and will be used for general corporate purposes of the Company and its subsidiaries. The term loans amortize in quarterly installments of 1.25% in each of the first two years following the funding, 1.875% for the next year, and 2.50% in each quarter thereafter. The Company may request up to two one-year extensions of the maturity date. The Company may, subject to customary conditions, increase the global tranche or obtain incremental term loans in an aggregate amount not to exceed (x) the greater of (i) $168 million and (ii) 100% of consolidated EBITDA for the four fiscal quarters ended most recently before such date, plus (y) any voluntary prepayment of term loans, plus (z) any amount that, after giving effect to the increase, the pro forma First Lien Net Leverage Ratio (as defined in the 2024 Credit Agreement) does not exceed 2.75 to 1.00. The Company may also, subject to customary conditions, request to increase the Danish tranche by up to $5 million. Borrowings bear interest at the applicable interest rate index selected by the Company based on the particular currency borrowed plus a credit spread adjustment depending on the index, and a margin ranging from 1.25% to 2.25% per annum 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 depending on the index. Interest is payable at the end of the selected interest period, but no less frequently than quarterly. The Company may prepay the borrowings, in whole or in part, at any time without premium or penalty, subject to certain conditions. The Company’s obligations under the 2024 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. Outstanding borrowings at December 31, 2024 under the 2024 Credit Agreement were $545.4 million , net of deferred financing costs, consisting of current borrowings of $25.2 million and long-term debt of $520.1 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 $2.5 million and $2.3 million at December 31, 2024 and 2023, respectively. At December 31, 2024, the weighted average interest rate on borrowings under the 2024 Credit Agreement was 5.6% , primarily consisting of Term SOFR for borrowings in U.S. dollars and EURIBOR for borrowings in euros, adjusted for the impact of the interest rate swap agreement on $100 million of the U.S. dollar borrowings. At December 31, 2023, the weighted average interest rate under our 2022 Credit Agreement was 5.0%, under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings. During the year ended December 31, 2024, our average daily alternative base rate loan balance was $0.7 million , compared to a balance of $0.1 million for the year ended December 31, 2023. The 2024 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 2024 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 for borrowings under the facility in euros and U.S. dollars. Under the amended terms, the overdraft facility provides for borrowings of up to Polish zloty 30 million (approximately $7.3 million) if borrowings are solely in Polish zloty, or up to 85% of the Polish zloty 30 million limit (approximately $6.2 million) if borrowings are in euros and/or U.S. dollars. The overdraft facility had an original maturity date in March 2024, with automatic three-month renewals until June 2027, subject to cancellation by either party, at its sole discretion, at least 30 days prior to the commencement of the three-month renewal period. The facility automatically renewed in December 2024 to a March 2025 maturity date. Borrowings under the amended overdraft facility will bear interest at a rate equal to (i) the one month Warsaw Interbank Offered Rate (“WIBOR”) + 1.0% for borrowings in Polish zloty, (ii) the one month Euro Interbank Offered Rate (“EURIBOR”) + 1.0% for borrowings in Euros, and (iii) the Mid-Point of the Fed Target Range + 1.25% for borrowings in U.S dollars. Borrowings under the overdraft facility are guaranteed by Standard Motor Products, Inc., the ultimate parent company. There were no borrowings outstanding under the overdraft facility at both December 31, 2024 and December 31, 2023. Maturities of Debt As of December 31, 2024, maturities of debt through 2038 , assuming no prepayments, are as follows (in thousands): Multi-Currency Revolver U.S. Dollar Term Loan Euro Term Loan Other Debt Total 2025 $ 10,800 $ 9,516 $ 4,923 $ 1,878 $ 27,117 2026 — 9,606 4,973 1,146 15,725 2027 — 14,655 7,598 1,238 23,491 2028 — 19,703 10,221 1,177 31,101 2029 233,371 144,807 75,193 1,214 454,585 Thereafter — — — 10,295 10,295 Total $ 244,171 $ 198,287 $ 102,908 $ 16,948 $ 562,314 Less: current maturities (10,800) (9,516) (4,923) (1,878) (27,117) Long-term debt $ 233,371 $ 188,771 $ 97,985 $ 15,070 $ 535,197 Deferred Financing Costs Deferred financing costs related to our term loan and revolving credit facilities were $4.8 million and $1.6 million as of December 31, 2024 and 2023, respectively. In connection with the July 2024 amendment to our 2022 Credit Agreement and the 2024 Credit Agreement, we deferred financing costs of $5.1 million that will be amortized over the term of the borrowings, and expensed $1.4 million of pre-existing unamortized financing costs to interest expense in our consolidated statement of operations. Deferred financing costs as of December 31, 2024, assuming no prepayments, are being amortized in the amounts of $1.2 million in 2025, $1.1 million in 2026, $1 million in 2027, $0.9 million in 2028, and $0.6 million in 2029.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income Attributable to SMP	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income Attributable to SMP	Accumulated Other Comprehensive Income Attributable to SMP Changes in Accumulated Other Comprehensive Income by Component (in thousands): Foreign Currency Translation Cash Flow Hedges Postretirement Benefit Plans Total Balance at December 31, 2022 $ (16,330) $ 3,823 $ 37 $ (12,470) Other comprehensive income before reclassifications 7,433 831 (a) — 8,264 Amounts reclassified from accumulated other comprehensive income — (2,372) (b) (22) (c) (2,394) Net other comprehensive income (loss) 7,433 (1,541) (22) 5,870 Tax amounts — 617 9 626 Balance at December 31, 2023 $ (8,897) $ 2,899 $ 24 $ (5,974) Other comprehensive income before reclassifications (23,385) 2,893 (a) — (20,492) Amounts reclassified from accumulated other comprehensive income — (2,524) (b) (18) (c) (2,542) Net other comprehensive income (loss) (23,385) 369 (18) (23,034) Tax amounts 2,513 656 7 3,176 Balance at December 31, 2024 $ (29,769) $ 3,924 $ 13 $ (25,832) (a) Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedges of $1.4 million ($1.0 million, net of tax) plus cash settlement receipts of $2.5 million ($1.9 million, net of tax) in the year ended December 31, 2024; and the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $1.2 million ($0.9 million, net of tax) plus cash settlement receipts of $2.4 million ($1.7 million, net of tax) in the year ended December 31, 2023. (b) 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. (c) 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.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2024
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity In July 2022 , our Board of Directors authorized the purchase of up to $30 million of our common stock under a stock repurchase program. Stock will be purchased under the program from time to time, in the open market or through private transactions, as market conditions warrant. To date, there have been 321,229 shares repurchased for a total cost of $10.4 million, all of which occurred during the first half of 2024. As of December 2023 there had been no repurchases of our common stock under the program.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans Our stock-based compensation program is a broad-based program designed to attract and retain employees while also aligning employees’ interests with the interests of our shareholders. In addition, members of our Board of Directors participate in our stock-based compensation program in connection with their service on our board. In May 2021, our Board of Directors and Shareholders approved an amendment and restatement to the 2016 Omnibus Incentive Plan (the “Plan”). Under the Plan, which terminates in May 2026, 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 2,050,000 shares; and shares of restricted and performance-based stock to non-employee directors of up to 350,000 shares. Share awards granted under the Plan that are cancelled, forfeited or expire by their terms are eligible to be granted again under the Plan. The 2016 Omnibus Incentive Plan is the only remaining plan available to provide stock-based incentive compensation to our employees, directors and other eligible persons. Awards previously granted under the 2006 Omnibus Incentive Plan remain outstanding, while shares not yet granted under the plan are not available for future issuance. We account for our stock-based compensation plans in accordance with the provisions of FASB ASC 718, Stock Compensation , which requires that a company measure the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The service period is the period of time that the grantee must provide services to us before the stock-based compensation is fully vested. The grant-date fair value of the award is recognized as an expense on a straight-line basis over the requisite service periods in our consolidated statements of operations. Forfeitures are estimated at the time of grant based on historical trends in order to estimate the amount of share-based awards that will ultimately vest. We monitor actual forfeitures for any subsequent adjustment to forfeiture rates. Restricted Stock and Performance Share Grants We currently grant shares of restricted stock to eligible employees and our independent directors and performance-based stock to eligible employees. We grant eligible employees two types of restricted stock (standard restricted shares and long-term retention restricted shares). Standard restricted shares granted to employees become fully vested generally no earlier than three years after the date of grant. Long-term retention restricted shares granted to selected executives vest at a 25% rate on or within approximately two months of an executive reaching the ages of 60 and 63, and become fully vested on or within approximately two months of an executive reaching the age of 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 generally no earlier than three years after the date of grant. Each period we evaluate the probability of achieving the applicable targets, and 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 5% for employees and 0% for executives and directors based upon our evaluation of historical and expected future turnover. Before a restricted share becomes fully vested or a performance share is issued, the awardees cannot transfer, pledge, hypothecate or encumber such shares. Prior to the time a restricted share is fully vested, the awardees have all other rights of a stockholder, including the right to vote (but do not receive dividends during the vesting period). Prior to the time a performance share is issued, the awardees have no rights as a stockholder. All shares and rights are subject to forfeiture if certain employment conditions are not met. At December 31, 2024, under the Plan, there were an aggregate of (a) 1,863,027 shares of restricted and performance-based stock grants issued, net of forfeitures, and (b) 186,973 shares of common stock available for future grants. For the year ended December 31, 2024, 277,742 restricted and performance-based shares were granted ( 199,510 restricted shares and 78,232 performance-based shares). In determining the grant date fair value, the stock price on the date of grant, as quoted on the New York Stock Exchange, was reduced by the present value of dividends expected to be paid on the shares issued and outstanding during the requisite service period, discounted at a risk-free interest rate. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the restriction or vesting period at the grant date. In addition, a further discount for the lack of marketability reduced the fair value of grants issued to certain key executives and directors subject to the one As related to restricted and performance stock shares, we recorded compensation expense of $5.8 million ( $4.3 million , net of tax), $6.2 million ( $4.8 million , net of tax) and $7.6 million ( $5.7 million , net of tax), for the years ended December 31, 2024, 2023 and 2022, respectively. The following table shows stock-based compensation unamortized compensation expense and the weighted-average periods over which the unamortized compensation expense is expected to be recognized: Year ended December 31, (in millions, except years) 2024 2023 2022 Unamortized compensation expense $ 13.5 $ 13.3 $ 14.9 Expected period to be recognized for employees 3.7 years 4.1 years 4.3 years Expected period to be recognized for directors 0.3 years 0.3 years 0.3 years Our restricted and performance-based share activity was as follows for the years ended December 31, 2024 and 2023: Shares Weighted Average Grant Date Fair Value per Share Balance at December 31, 2022 880,829 $ 31.79 Granted 230,875 27.00 Vested (248,065) 36.30 Performance Shares Target Adjustment 29,137 36.30 Forfeited (11,800) 35.36 Balance at December 31, 2023 880,976 $ 29.48 Granted 277,742 24.25 Vested (181,430) 34.46 Performance Shares Target Adjustment (14,247) 39.28 Forfeited (34,017) 29.83 Balance at December 31, 2024 929,024 $ 26.82 The weighted-average grant date fair value of restricted and performance-based shares outstanding as of December 31, 2024, 2023 and 2022 was $25.5 million (or $26.82

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Employee Benefits	15. Employee Benefits Defined Contribution Plans We maintain various defined contribution plans, which include profit sharing, and provide retirement benefits for substantially all of our employees. Matching obligations, in connection with the plans which are funded in cash and typically contributed to the plans in March of the following year, are as follows (in thousands): U.S. Defined Contribution Year ended December 31, 2024 $ 10,314 2023 10,510 2022 10,180 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 and 2023, contributions of $0.6 million and $0.8 million were made related to calendar years 2023 and 2022, respectively. As of December 31, 2024, we have recorded an obligation of $0.4 million for 2024. We also have an Employee Stock Ownership Plan and Trust (“ESOP”) 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 its fiduciary duties. During 2024 , we contributed to the trust an additional 68,700 shares from our treasury and released 68,700 shares from the trust leaving 200 shares remaining in the trust as of December 31, 2024. The provision for expense in connection with the ESOP was approximately $2.8 million in 2024, $3.0 million in 2023 and $2.3 million in 2022.

Other Non-Operating Income, Net

Other Non-Operating Income, Net	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Other Non-Operating Income, Net	Other Non-Operating Income, Net The components of other non-operating income, net are as follows (in thousands): Year Ended December 31, 2024 2023 2022 Interest and dividend income $ 871 $ 517 $ 209 Equity income from joint ventures 4,274 2,070 3,464 Gain (loss) on foreign exchange 1,228 (776) 334 Other non-operating income, net 504 515 807 Total other non-operating income, net $ 6,877 $ 2,326 $ 4,814

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Instruments As part of our risk management strategy, we occasionally use derivative instruments, including interest rate swaps, forward foreign exchange contracts and non-derivative instruments such as foreign currency denominated debt, to reduce our market risk for changes in interest rates and to manage foreign exchange rate risk. The objective is to offset gains and losses resulting from these exposures with losses and gains on the derivative contracts used to hedge them, thereby reducing volatility of earnings or protecting the fair value of assets and liabilities. Derivative instruments may be designated as fair value hedges, cash flow hedges or hedges of the foreign currency exposure of a net investment in a foreign operation (“net investment hedges”) or they may not be designated as hedging instruments. Derivative instruments are recognized at fair value on a gross basis in the consolidated balance sheets. The change in fair value of the derivative instruments is recognized in the consolidated statements of operations or consolidated statements of comprehensive income depending upon the type of hedge as further discussed below. Cash flows from derivative programs are classified with the activities that correspond to the underlying hedged items in the consolidated statements of cash flows. Due to the use of derivative instruments, we are exposed to the risk that our counterparties will fail to meet their contractual obligations. To mitigate counterparty credit risk, we have a policy of only entering into derivative contracts with carefully selected major financial institutions based on their credit ratings and other factors, and periodically reassess their creditworthiness. We do not offset d erivative assets against liabilities in master netting agreements and there were no receivables or payables recognized on receipt or payment of cash collateral at December 31, 2024 and 2023 . The interest rate swa ps effectively convert a portion of our variable rate borrowings under our existing facilities to a fixed rate based upon determined notional amount. The forward foreign exchange contracts fix expected future cash flows in U.S. dollar terms on certain transactions and foreign currency denominated debt is used to partially offsets the effects of foreign currency on our investments in certain foreign subsidiaries. We do not enter into derivative instruments for trading or speculative purposes. Cash Flow Hedges In 2022, we entered into an interest rate swap agreement with a notional amount of $100 million that matures in May 2029. The interest rate swap agreement is designated as a cash flow hedge of interest payments on $100 million of borrowings under our 2024 Credit Agreement. Under the terms of the swap agreement, we will receive monthly variable interest payments based on one month Term SOFR and will pay interest based on a fixed rate of 2.683% per annum. In October 2024, we entered into an interest rate swap agreement with an initial notional amount of €100 million that matures in March 2030. At December 31, 2024, the notional amount was $103.9 million or €100 million. The interest rate swap agreement is designated as a cash flow hedge of interest payments on euro denominated borrowings under our 2024 Credit Agreement equal to the notional amount of the interest rate swap agreement. The notional amount of the interest rate swap will decrease quarterly starting from June 2025. Under the terms of the swap agreement, we will receive monthly variable interest payments based on one month EURIBOR and will pay interest based on a fixed rate of 2.11% per annum. The fair value of the interest rate swap agreements as of December 31, 2024 was an asset of $5.4 million and a liability of $0.1 million and an asset of $3.9 million as of December 31, 2023, which has been deferred and recorded in accumulated other comprehensive income, net of income taxes, in our consolidated balance sheet. When the hedged interest payment on the underlying borrowing is recognized in interest expense, the respective deferred gain/loss in accumulated other comprehensive income is reclassified to earnings as interest expense in the consolidated statements of operations. The amount to be reclassified from accumulated other comprehensive income in the next twelve months is expected to be $1.3 million. We perform quarterly hedge effectiveness assessments and anticipate that the interest rate swap will be highly effective throughout its term. If it becomes probable that the hedged interest payment(s) will not occur, we immediately recognize the related deferred hedging gains/losses in earnings. There were no such reclassifications during the year ended December 31, 2024. Net Investment Hedge At December 31, 2024, $202.5 million or €195 million notional amount of euro-denominated debt is designated as a hedge of our net investment in Nissens Automotive's foreign operations whose functional currency is Danish kroner. Provided the net investment hedge is highly effective, gains/losses are recorded as a currency translation adjustment in accumulated other comprehensive income in the consolidated balance sheet. The gains/losses will subsequently be reclassified into earnings when the hedged net investment is either sold or substantially liquidated. We recognized a gain of $9.7 million as a currency translation adjustment in other comprehensive income in 2024. No gains or losses related to the net investment hedge were recognized in earnings in 2024. Non-Designated Derivatives In 2024, we realized losses of $2.5 million related to forward foreign exchange contracts that were used to economically hedge forecasted foreign currency transactions primarily related to our acquisition of Nissens Automotive. The losses were recorded in selling, general and administrative expenses in the consolidated statement of operations.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 December 31, 2024 and December 31, 2023 (in thousands): December 31, 2024 December 31, 2023 Fair Value Hierarchy Fair Value Carrying Amount Fair Value Carrying Amount Cash and cash equivalents (a) Level 1/2 $ 44,426 $ 44,426 $ 32,526 $ 32,526 Deferred compensation Level 1 26,333 26,333 23,893 23,893 Short-term investments Level 2 6,956 6,956 — — Long-term investments Level 2 93 93 7,468 7,468 Cash flow hedge interest rate swaps Level 2 5,409 5,409 3,939 3,939 Short term borrowings Level 1 27,117 27,117 5,029 5,029 Long-term debt Level 1 535,197 535,197 151,182 151,182 (a) As of December 31, 2024 cash and cash equivalents consist of cash of $44.4 million. Ca sh and cash equivalents at December 31, 2023 consist of cash of $29.5 million and cash equivalents of $3 million , which are classified as Level 1 and Level 2, respectively, under the fair value hierarchy. Cash equivalents consist of certificates of deposit with original maturities of 3 months, or less. These securities are accounted for as held-to-maturity and recorded at amortized cost, which approximates their fair values at December 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. Long-term investments consist of certificates of deposit with original maturities in excess of twelve months. These securities are accounted for as held-to-maturity and recorded at amortized cost, which approximates their fair values at December 31, 2024.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The income tax provision (benefit) consists of the following (in thousands): Year Ended December 31, 2024 2023 2022 Current: Domestic $ 19,761 $ 15,422 $ 16,182 Foreign 11,254 9,224 8,669 Total current 31,015 24,646 24,851 Deferred: Domestic (9,536) (5,769) 1,102 Foreign (2,094) (509) (747) Total deferred (11,630) (6,278) 355 Total income tax provision $ 19,385 $ 18,368 $ 25,206 Reconciliations between taxes at the U.S. Federal income tax rate and taxes at our effective income tax rate on earnings from continuing operations before income taxes are as follows (in thousands): Year Ended December 31, 2024 2023 2022 U.S. Federal income tax rate of 21% $ 15,538 $ 17,160 $ 20,650 Increase (decrease) in tax rate resulting from: State and local income taxes, net of federal income tax benefit 1,922 2,086 3,118 Change in valuation allowance 770 674 1,068 Income tax (benefit) attributable to foreign income 4,370 377 (53) Other non-deductible items, net (3,215) (1,929) 423 Provision for income taxes $ 19,385 $ 18,368 $ 25,206 The following is a summary of the components of the net deferred tax assets and liabilities recognized in the accompanying consolidated balance sheets (in thousands): December 31, 2024 2023 Deferred tax assets: Inventories $ 9,087 $ 10,493 Allowance for customer returns 17,854 13,083 Accrued asbestos liabilities 24,032 20,758 Accrued salaries and benefits 13,564 11,816 Tax credit and net operating loss carryforwards 5,690 5,968 Allowance for expected credit losses 3,586 3,567 Other 10 17 73,823 65,702 Valuation allowance (4,849) (3,830) Total deferred tax assets 68,974 61,872 Deferred tax liabilities: Intangible assets acquired, net of amortization 43,755 12,668 Depreciation 6,669 7,597 Interest rate swap agreement 1,345 990 Other 4,006 84 Total deferred tax liabilities 55,775 21,339 Net deferred tax assets $ 13,199 $ 40,533 In assessing the realizability of the deferred tax assets, we consider whether it is more likely than not that some portion or the entire deferred tax asset will be realized. Ultimately, the realization of the deferred tax asset is dependent upon the generation of sufficient taxable income in those periods in which temporary differences become deductible and/or net operating loss carryforwards can be utilized. We consider the level of historical taxable income, scheduled reversal of temporary differences, carryback and carryforward periods, tax planning strategies and projected future taxable income in determining whether a valuation allowance is warranted. We also consider cumulative losses in recent years as well as the impact of one-time events in assessing our pre-tax earnings. Assumptions regarding future taxable income require significant judgment. Our assumptions are consistent with estimates and plans used to manage our business. The valuation allowance of $4.8 million as of December 31, 2024 is intended to provide for uncertainty regarding the ultimate realization of our U.S. foreign tax credit carryovers of $4.6 million that will expire in varying amounts by 2032, and foreign net operating losses of $0.2 million. Based on these considerations, we believe it is more likely than not that we would realize the benefit of the net deferred tax asset of $13.2 million as of December 31, 2024, which is net of the remaining valuation allowance. As related to the taxation of our foreign subsidiaries, we aggregate our foreign earnings and profits, and utilize allowable deductions and available foreign tax credits in computing our U.S. tax. Notwithstanding the U.S. taxation of these amounts, we intend to continue to invest most of these earnings indefinitely outside of the U.S., and do not expect to incur any significant additional taxes related to such amounts. We recognize in our financial statements only those tax positions that meet the more-likely-than-not recognition threshold. We establish tax reserves for uncertain tax positions that do not meet this threshold. During the years ended December 31, 2024, 2023 and 2022, we did not establish a liability for uncertain tax positions. We are subject to taxation in the U.S. and various state, local and foreign jurisdictions. As of December 31, 2024, the Company is no longer subject to U.S. Federal tax examinations for years before 2021. We remain subject to examination by state and local tax authorities for tax years 2020 through 2023. Foreign jurisdictions have statutes of limitations generally ranging from 2 to 6 years. Years still open to examination by foreign tax authorities in major jurisdictions include Canada (2020 onward), Hong Kong (2019 onward), China (2022 onward), Mexico (2018 onward), Poland (2019 onward), Hungary (2019 onward), Germany (2020 onward), Denmark (2019 onward) and Slovakia (2019 onward). We do not presently anticipate that our unrecognized tax benefits will significantly increase or decrease over the next 12 months; however, actual developments in this area could differ from those currently expected.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share We present two calculations of earnings per common share. “Basic” earnings per common share equals net earnings attributable to SMP divided by weighted average common shares outstanding during the period. “Diluted” earnings per common share equals net earnings attributable to SMP divided by the sum of weighted average common shares outstanding during the period plus potentially dilutive common shares. Potentially dilutive common shares that are anti-dilutive are excluded from 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 attributable to SMP (in thousands, except share and per share data): Year Ended December 31, 2024 2023 2022 Net earnings (loss) attributable to SMP Continuing operations 53,628 63,144 73,042 Discontinued operations (26,128) (28,996) (17,691) Net earnings attributable to SMP $ 27,500 $ 34,148 $ 55,351 Basic net earnings (loss) per common share attributable to SMP Continuing operations $ 2.46 $ 2.91 $ 3.37 Discontinued operations $ (1.20) $ (1.34) $ (0.82) Diluted net earnings (loss) per common share attributable to SMP Continuing operations $ 2.41 $ 2.85 $ 3.30 Discontinued operations $ (1.17) $ (1.31) $ (0.80) Weighted average number of common shares, basic 21,801,141 21,716,177 21,683,719 Dilutive effect of restricted stock and performance-based stock 435,919 445,164 456,262 Weighted average number of common shares, diluted 22,237,060 22,161,341 22,139,981 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): 2024 2023 2022 Restricted and performance shares 285 280 292

Industry Segment and Geographic

Industry Segment and Geographic Data	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Industry Segment and Geographic Data	Industry Segment and Geographic Data Our business is organized into four operating segments, Vehicle Control, Temperature Control, Engineered Solutions and Nissens Automotive, each of which focuses on a specific line of business. Our automotive aftermarket business is comprised of three operating segments, Vehicle Control, Temperature Control and Nissens Automotive, while our Engineered Solutions operating segment offers a broad array of conventional and future-oriented technologies. Nissens Automotive is a new operating segment created in the fourth quarter of 2024 comprising of our acquisition in November 2024. The Vehicle Control operating segment includes sales from ignition emissions and fuel delivery, electrical and safety, and wire sets and other product categories to automotive aftermarket customers. The Temperature Control operating segment includes sales from air conditioning system components and other thermal product categories to automotive aftermarket customers primarily in the United States, and is poised to benefit from the broader adoption of more complex air conditioning systems that will provide passenger comfort regardless of the vehicle's powertrain. The Engineered Solutions operating segment includes sales of custom-engineered solutions to vehicle and equipment manufacturers in highly diversified global end-markets such as commercial and light vehicles, construction, agriculture, power sports and marine. The Nissens Automotive operating segment includes sales of engine cooling, air conditioning system components and engine efficiency products to automotive aftermarket customers primarily in Europe. There are no intersegment sales among our operating segments. Other consists of financial information related to the activities of our corporate headquarters function. We identify our operating segments based on how our chief operating decision maker ("CODM"), our President and Chief Executive Officer, allocates resources, assesses performance and makes decisions. The CODM uses operating income (loss) to allocate resources (including employees, property, and financial or capital resources) for each segment during the annual budget and forecasting process. The CODM considers budget-to-actual and year-over-year variances on a monthly basis for the significant measure when making decisions about allocating capital and personnel to the segments. The CODM also uses segment gross profit for evaluating product pricing and operating income (loss) to assess the performance for each segment by comparing the results with one another. In addition to these measures, the CODM tracks expenses at a disaggregated level to understand the drivers of total operating expenses. These include selling, general and administrative expenses, distribution expenses, supply chain financing expenses, restructuring and integration expenses, and any other special expense items. In tracking these expenses separately, the CODM is able to identify opportunities for adjusting how the business uses funds to achieve greater profitability. The accounting policies of each segment are the same as those described in Note 1, "Summary of Significant Accounting Policies". The following tables contain financial information for each reportable operating segment (in thousands): Year ended December 31, 2024 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total Net sales $ 762,560 $ 380,088 $ 285,456 $ 35,745 $ — $ 1,463,849 Cost of sales 518,475 262,296 235,537 24,220 — 1,040,528 Gross profit 244,085 117,792 49,919 11,525 — 423,321 Selling and marketing expenses 45,878 15,938 8,060 1,536 — 71,412 Distribution expenses 57,627 32,858 5,290 7,097 4,579 107,451 General and administration expenses 36,935 16,763 20,906 5,560 17,052 97,216 Supply chain financing expenses 32,090 16,449 — — — 48,539 Restructuring and integration expenses 4,249 847 843 — 1,729 7,668 Other expenses — — — 100 10,311 10,411 Total operating expenses 176,779 82,855 35,099 14,293 33,671 342,697 Operating income (loss) $ 67,306 $ 34,937 $ 14,820 $ (2,768) $ (33,671) $ 80,624 Other non-operating income, net 6,877 Interest expense 13,512 Earnings from continuing operations before income taxes $ 73,989 Year ended December 31, 2023 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total Net sales $ 737,932 $ 337,754 $ 282,586 $ — $ — $ 1,358,272 Cost of sales 499,717 241,927 227,802 — — 969,446 Gross profit 238,215 95,827 54,784 — — 388,826 Selling and marketing expenses 46,223 16,772 8,407 — — 71,402 Distribution expenses 54,401 30,467 4,989 — — 89,857 General and administration expenses 34,430 14,664 21,186 — 15,937 86,217 Supply chain financing expenses 30,558 15,473 — — — 46,031 Restructuring and integration expenses 1,276 1,108 258 — — 2,642 Other expenses — — — — — — Total operating expenses 166,888 78,484 34,840 — 15,937 296,149 Operating income (loss) $ 71,327 $ 17,343 $ 19,944 $ — $ (15,937) $ 92,677 Other non-operating income, net 2,326 Interest expense 13,287 Earnings from continuing operations before income taxes $ 81,716 Year ended December 31, 2022 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total Net sales $ 750,571 $ 351,237 $ 270,007 $ — $ — $ 1,371,815 Cost of sales 518,304 252,323 218,649 — — 989,276 Gross profit 232,267 98,914 51,358 — — 382,539 Selling and marketing expenses 49,245 17,666 7,239 — — 74,150 Distribution expenses 54,081 29,868 4,377 — — 88,326 General and administration expenses 31,812 13,969 21,029 — 15,190 82,000 Supply chain financing expenses 21,480 10,557 — — — 32,037 Restructuring and integration expenses 1,496 395 — — — 1,891 Other expenses — — — — — — Total operating expenses 158,114 72,455 32,645 — 15,190 278,404 Operating income (loss) $ 74,153 $ 26,459 $ 18,713 $ — $ (15,190) $ 104,135 Other non-operating income, net 4,814 Interest expense 10,617 Earnings from continuing operations before income taxes $ 98,332 Year Ended December 31, 2024 2023 2022 Depreciation and amortization Vehicle Control $ 14,841 $ 13,877 $ 14,075 Temperature Control 3,307 3,424 2,973 Engineered Solutions 9,608 9,966 9,557 Nissens Automotive 1,943 — — Other 1,714 1,755 1,693 Total depreciation and amortization $ 31,413 $ 29,022 $ 28,298 Investment in unconsolidated affiliates Vehicle Control $ 2,447 $ 2,496 $ 2,490 Temperature Control 20,396 19,711 27,557 Engineered Solutions 1,999 1,843 11,698 Nissens Automotive — — Other — — — Total investment in unconsolidated affiliates $ 24,842 $ 24,050 $ 41,745 Capital expenditures Vehicle Control $ 29,603 $ 13,955 $ 13,378 Temperature Control 2,621 1,899 3,973 Engineered Solutions 9,721 12,095 6,489 Nissens Automotive 213 — — Other 1,860 684 2,116 Total capital expenditures $ 44,018 $ 28,633 $ 25,956 Total assets Vehicle Control $ 659,607 $ 620,569 $ 618,789 Temperature Control 276,216 274,657 254,137 Engineered Solutions 285,866 292,080 289,518 Nissens Automotive 482,773 — — Other 109,664 105,741 92,485 Total assets $ 1,814,126 $ 1,293,047 $ 1,254,929 December 31, (in thousands) 2024 2023 2022 Long-lived assets (a) United States $ 378,557 $ 368,792 $ 326,199 Denmark 347,629 — — Asia 67,406 75,869 76,766 Europe 59,909 $ 44,517 $ 38,351 Mexico 21,173 13,262 10,355 Canada 4,329 5,851 7,161 Total long-lived assets $ 879,003 $ 508,291 $ 458,832 (a) Long-lived assets are attributed to countries based upon the location of the assets. Our three largest individual customers accounted for approximately 60.7% of our consolidated net sales in 2024 . During 2024 , O’Reilly Auto Parts, AutoZone and NAPA accounted for 28.4% , 18.8% and 13.5% of our consolidated net sales, respectively. Net sales from each of the customers were reported in our Vehicle Control and Temperature Control operating segments. The loss of one or more of these customers or, a significant reduction in purchases of our products from any one of them could have a material adverse impact on our business, financial condition and results of operations. In addition, any consolidation among our key customers may further increase our customer concentration risk. For the disaggregation of our net sales from customers by major product group and geographic area within each of our operating segments, see Note 22, “Net Sales.”

Net Sales

Net Sales	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Net Sales	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 primarily in the United States. 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 Nissens Automotive operating segment generates its revenues from aftermarket sales of engine cooling, air conditioning system components and engine efficiency products primarily in Europe. The following table summarizes consolidated net sales by major product group within each operating segment for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, 2024 2023 2022 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 467,460 $ 450,180 $ 454,571 Electrical and Safety 229,361 221,782 230,487 Wire Sets and Other 65,739 65,970 65,513 Total Vehicle Control 762,560 737,932 750,571 Temperature Control AC System Components 274,926 237,756 245,484 Other Thermal Components 105,162 99,998 105,753 Total Temperature Control 380,088 337,754 351,237 Engineered Solutions Commercial Vehicle 89,171 79,376 80,275 Construction/Agriculture 35,832 41,665 42,385 Light Vehicle 91,548 92,701 91,533 All Other 68,905 68,844 55,814 Total Engineered Solutions 285,456 282,586 270,007 Nissens Automotive Engine Cooling 19,287 — — Air Conditioning 9,214 — — Engine Efficiency 7,244 — — Total Nissens Automotive 35,745 — — Other — — — Total $ 1,463,849 $ 1,358,272 $ 1,371,815 Geographic Area We sell our line of products primarily in the United States, with additional sales in Europe, Canada, Mexico, Asia and other foreign countries. 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 years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, 2024 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total United States $ 677,779 $ 360,858 $ 154,960 $ 2,213 $ — $ 1,195,810 Europe 1,118 176 53,682 31,757 — 86,733 Canada 37,683 16,707 31,027 82 — 85,499 Mexico 40,555 171 9,138 14 — 49,878 Asia 330 1,741 33,508 1,098 — 36,677 Other foreign 5,095 435 3,141 581 — 9,252 Total $ 762,560 $ 380,088 $ 285,456 $ 35,745 $ — $ 1,463,849 Year Ended December 31, 2023 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total United States $ 659,570 $ 319,904 $ 168,878 $ — $ — $ 1,148,352 Canada 36,088 17,081 25,689 — — 78,858 Europe 916 8 59,266 — — 60,190 Mexico 36,350 49 6,658 — — 43,057 Asia 351 526 19,522 — — 20,399 Other foreign 4,657 186 2,573 — — 7,416 Total $ 737,932 $ 337,754 $ 282,586 $ — $ — $ 1,358,272 Year Ended December 31, 2022 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total United States $ 682,145 $ 335,281 $ 191,678 $ — $ — $ 1,209,104 Canada 35,233 14,596 16,762 — — 66,591 Europe 661 75 37,784 — — 38,520 Mexico 26,019 401 4,897 — — 31,317 Asia 2,408 63 16,715 — — 19,186 Other foreign 4,105 821 2,171 — — 7,097 Total $ 750,571 $ 351,237 $ 270,007 $ — $ — $ 1,371,815

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Warranties We generally warrant our products against certain manufacturing and other defects. These product warranties are provided for specific periods of time depending on the nature of the product. Accruals for estimated product warranty claims are included in accrued customer returns on the consolidated balance sheet. The following table provides the changes in our product warranties (in thousands): December 31, 2024 2023 Balance, beginning of period $ 21,134 $ 19,667 Liabilities accrued for current year sales 134,831 120,027 Settlements of warranty claims (131,249) (118,560) Balance, end of period $ 24,715 $ 21,134 Letters of Credit As of December 31, 2024 and 2023, we had outstanding letters of credit with certain vendors aggregating approximately $2.5 million and $2.3 million, respectively. These letters of credit are being maintained as security for reimbursements to insurance companies and as security to the landlord of our administrative offices in Long Island City, New York. The contract amount of the letters of credit is a reasonable estimate of their value as the value for each is fixed over the life of the commitment. Change of Control Arrangements We have a change in control arrangement with one key officer. In the event of a change of control (as defined in the agreement), the executive will receive severance payments and certain other benefits as provided in his agreement. 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 December 31, 2024, approximately 1,287 cases were outstanding for which we may be responsible for any related liabilities. Since inception in September 2001 through December 31, 2024, the amounts paid for settled claims and awards of asbestos-related damages, including interest, were approximately $91.4 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: (i) historical data available from publicly available studies; (ii) an analysis of our recent claims history to estimate likely filing rates into the future; (iii) an analysis of our currently pending claims; (iv) an analysis of our settlements and awards of asbestos-related damages to date; and (v) 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, 2024. The results of the August 31, 2024 study included an estimate of our undiscounted liability for settlement payments and awards of asbestos-related damages, excluding legal costs, ranging from $99.6 million to $210.8 million for the period through 2065. The change from the prior year study, which was as of August 31, 2023, was a $15.6 million increase for the low end of the range and a $75.5 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, 2024 actuarial study, in September 2024 we increased our asbestos liability to $99.6 million , the low end of the range, and recorded an incremental pre-tax provision of $29.3 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, 2024 study, to range from $49.8 million to $115.9 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 $15.3 million , $11 million and $12.0 million for the years ended December 31, 2024, 2023 and 2022, 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 In connection with the aforementioned former brake business, we were subject to a legal proceeding alleging a breach of contract claim of the related purchase agreement. In August 2023, we reached a final settlement in the amount of $10.5 million and payment was made in October 2023. The full amount of the settlement was recorded $10.5 million in earnings (loss) from discontinued operations in the accompanying statement of operations in 2023. 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.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II ‑ Valuation and Qualifying Accounts Years ended December 31, 2024, 2023 and 2022 Additions Description Balance at beginning of year Charged to costs and expenses Other Deductions Balance at end of year Year ended December 31, 2024: Allowance for expected credit losses $ 6,884,000 $ 736,000 $ — $ 3,417,000 $ 4,203,000 Allowance for discounts 1,161,000 13,487,000 — 13,379,000 1,269,000 $ 8,045,000 $ 14,223,000 $ — $ 16,796,000 $ 5,472,000 Allowance for sales returns $ 38,238,000 $ 184,895,000 $ 3,360,000 (a) $ 180,022,000 $ 46,471,000 Year ended December 31, 2023: Allowance for expected credit losses $ 4,129,000 $ 2,940,000 $ — $ 185,000 $ 6,884,000 Allowance for discounts 1,246,000 12,449,000 — 12,534,000 1,161,000 $ 5,375,000 $ 15,389,000 $ — $ 12,719,000 $ 8,045,000 Allowance for sales returns $ 37,169,000 $ 162,525,000 $ — $ 161,456,000 $ 38,238,000 Year ended December 31, 2022: Allowance for expected credit losses $ 4,815,000 $ 6,242,000 (b) $ — $ 6,928,000 $ 4,129,000 Allowance for discounts 1,355,000 13,456,000 — 13,565,000 1,246,000 $ 6,170,000 $ 19,698,000 $ — $ 20,493,000 $ 5,375,000 Allowance for sales returns $ 42,412,000 $ 152,985,000 $ — $ 158,228,000 $ 37,169,000 (a) Allowances acquired through acquisition (b) Includes a $7 million charge relating to one of our customers that filed a petition for bankruptcy in January 2023.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	[1]	$ 27,500	$ 34,148	$ 55,351
[1] Throughout this Form 10-K, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	We maintain an enterprise-wide approach to risk management through which we identify, manage and mitigate significant risks, including those related to our information systems. Our cybersecurity risk management program, which applies to our global operations, focuses on our people, processes and technology, and is designed to secure our information systems by preventing, detecting and responding to current and emerging cybersecurity threats. Our employees are a key element of our cybersecurity risk management program. All of our employees are required to adhere to our cybersecurity practices, and undertake routine training to raise awareness and reinforce safe practices. Our training program includes bi-annual online training courses, group tabletop exercises, phishing and malicious email simulations, and information security bulletins. We also maintain policies that govern, and provide specific guidance to employees regarding how they may use our information systems. Another key element of our cybersecurity risk management program is our use of processes and technologies to create information security safeguards and controls, and target specific users or business needs. Our processes and technologies include firewalls, email security software and encryption, endpoint detection and response, access controls, backup and recovery procedures, system patches and updates, vulnerability scanning, penetration testing by third party vendors, incident response procedures, and internal and external audits of our information systems. Through these internal and external assessments, we continuously identify areas for remediation and opportunities to improve the security of our information systems, including by evaluating our program against industry standards and best practices, such as the Cybersecurity Framework established by the National Institute of Standards and Technology (NIST) and the CIS Critical Security Controls established by the Center for Internet Security. We also track key performance indicators that we believe are indicative of the effectiveness of our cybersecurity risk management program. For additional information related to cybersecurity risks that could have a material and adverse effect on our business, financial condition or results of operations, see “Our operations could be adversely affected by interruptions or breaches in the security of our computer and information systems” in Item 1A of this Report.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	We maintain an enterprise-wide approach to risk management through which we identify, manage and mitigate significant risks, including those related to our information systems. Our cybersecurity risk management program, which applies to our global operations, focuses on our people, processes and technology, and is designed to secure our information systems by preventing, detecting and responding to current and emerging cybersecurity threats.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Audit Committee of our Board of Directors oversees the adequacy and effectiveness of our internal controls, policies and procedures regarding cybersecurity, information security and data protection, and compliance with applicable laws and
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee of our Board of Directors oversees the adequacy and effectiveness of our internal controls, policies and procedures regarding cybersecurity, information security and data protection, and compliance with applicable laws and
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	On a quarterly basis, and more frequently as circumstances warrant, our CIO briefs the Audit Committee on our cybersecurity risks, our strategies for preventing, detecting, responding to and mitigating such risks, including the effectiveness of our incident response procedures, and our information security controls.
Cybersecurity Risk Role of Management [Text Block]	Our Chief Information Officer (“CIO”), in turn, is responsible for managing the Company’s cybersecurity risk management program and incident response procedures. On a quarterly basis, and more frequently as circumstances warrant, our CIO briefs the Audit Committee on our cybersecurity risks, our strategies for preventing, detecting, responding to and mitigating such risks, including the effectiveness of our incident response procedures, and our information security controls. Our CIO has extensive knowledge and expertise regarding our information systems and security, having served in a variety of senior information technology positions across our organization for more than thirty years, and as an executive officer of the Company since 2006. Additionally, our CIO leads an incident response team (“IRT”), charged with the on-going management of our cybersecurity program. This team is responsible for the prevention, mitigation, detection and remediation of cybersecurity risks and incidents affecting our operations pursuant to our incident response procedures. The IRT is composed of information security professionals, who collectively bring decades of relevant information security and cybersecurity experience to their roles. In the event that a cybersecurity incident is detected, the IRT performs a multi-factor, risk-based assessment to determine the appropriate level of response. Depending upon the results of the assessment, including the nature and magnitude of the event, our incident response procedures provide for oversight and management of an incident by the IRT, under the direction of the CIO, or, in the event of escalation, under the direction of the executive officers of the Company, with reporting to and oversight by the Audit Committee.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our Chief Information Officer (“CIO”), in turn, is responsible for managing the Company’s cybersecurity risk management program and incident response procedures.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CIO has extensive knowledge and expertise regarding our information systems and security, having served in a variety of senior information technology positions across our organization for more than thirty years, and as an executive officer of the Company since 2006.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	On a quarterly basis, and more frequently as circumstances warrant, our CIO briefs the Audit Committee on our cybersecurity risks, our strategies for preventing, detecting, responding to and mitigating such risks, including the effectiveness of our incident response procedures, and our information security controls.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Principles of Consolidation & Basis of Presentation	Principles of Consolidation & Basis of Presentation Stan dard 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 three segments, Vehicle Control, Temperature Control and Nissens Automotive, 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. In addition to our legacy SMP business, we acquired European automotive aftermarket parts supplier AX V Nissens III ApS (now known as SMP Nissens III ApS) and its direct and indirect subsidiaries (“Nissens Automotive”) in a transaction which closed on November 1, 2024. Nissens Automotive develops, manufactures and markets products within the areas of engine cooling, air conditioning climate systems, and engine efficiency within the automotive aftermarket industry, primarily in Europe. Nissens Automotive will serve as our fourth business segment. For further information and disclosures regarding the Nissens Automotive acquisition, refer to Note 2, "Business Combinations." These consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") an d include our accounts and all domestic and international companies that we control. In addition, we use the equity method, to include our share of the results of certain affiliates based on our economic interest, our ability to exercise significant influence over the operating or financial decisions of these affiliates or our ability to direct their economic resources. We do not control these affiliates, as our ownership in these other affiliates is generally 50% or less. All significant inter-company items have been eliminated.
Reclassification	Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2024 presentation.
Use of Estimates	Use of Estimates 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.
Reportable Segments	Reportable Segments Our business comprises of four operating segments – Vehicle Control, Temperature Control and Engineered Solutions from our legacy SMP business and a fourth operating segment, Nissens Automotive, which was created in the fourth quarter of 2024 as a result of our acquisition of Nissens Automotive. Our operating segment structure aligns our operations with our strategic focus on diversifying our business, provides greater transparency into our positioning to capture
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments purchased with a maturity of three months or less to be cash equivalents.
Allowance for Expected Credit Losses and Cash Discounts	Allowance for Expected Credit Losses and Cash Discounts We do not generally require collateral for our trade accounts receivable. Accounts receivable have been reduced by an allowance for amounts that may become uncollectible in the future. These allowances are established based on a combination of write-off history, supportable forecasts, aging analysis, and specific account evaluations. When a receivable balance is known to be uncollectible, it is written off against the allowance for expected credit losses. Cash discounts are provided based on an overall average experience rate applied to qualifying accounts receivable balances.
Inventories	Inventories Inventories are valued at the lower of cost and net realizable value. Cost is determined on the first-in first-out basis. Where appropriate, standard cost systems are utilized for purposes of determining cost; the standards are adjusted as necessary to ensure they approximate actual costs. Estimates of lower of cost and net realizable value of inventory are determined by comparing the actual cost of the product to the estimated selling prices in the ordinary course of business less reasonably predictable costs of completion, disposal and transportation of the inventory. We also evaluate inventories on a regular basis to identify inventory on hand that may be obsolete or in excess of current and future projected market demand. For inventory deemed to be obsolete, we provide a reserve on the full value of the inventory. Inventory that is in excess of current and projected use is reduced by an allowance to a level that approximates our estimate of future demand. Future projected demand requires management judgment and is based upon (a) our review of historical trends and (b) our estimate of projected customer specific buying patterns and trends in the industry and markets in which we do business. Using rolling twelve month historical information, we estimate future demand on a continuous basis. The historical volatility of such estimates has been minimal. We maintain provisions for inventory reserves of $43.7 million and $42.9 million as of December 31, 2024 and 2023, respectively. We utilize cores (used parts) in our remanufacturing processes for air conditioning compressors, diesel injectors, and diesel pumps. The production of air conditioning compressors, diesel injectors, and diesel pumps involves the rebuilding of used cores, which we acquire either in outright purchases from used parts brokers, or from returns pursuant to an exchange program with customers. Under such exchange programs, at the time of sale of air conditioning compressors, diesel injectors, and diesel pumps, we estimate the core expected to be returned from the customer and record the estimated return as unreturned customer inventory. In addition, many of our customers can return inventory to us based upon customer warranty and overstock arrangements within customer specific limits. At the time products are sold, we accrue a liability for product warranties and overstock returns and record an asset for unreturned customer inventory based on our estimate of anticipated customer returns. Estimates are based upon historical information on the nature, frequency and probability of the customer return. Unreturned core, warranty and overstock customer inventory is recorded at standard cost. Revision to these estimates is made when necessary, based upon changes in these factors. We regularly study trends of such claims.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are recorded at historical cost and are depreciated using the straight-line method of depreciation over the estimated useful lives as follows: Estimated Life Buildings 25 to 33-1/2 years Building improvements 10 to 25 years Machinery and equipment 5 to 12 years Tools, dies and auxiliary equipment 3 to 8 years Furniture and fixtures 3 to 12 years Leasehold improvements are depreciated over the shorter of the estimated useful life or the term of the lease. Costs related to maintenance and repairs which do not prolong the assets useful lives are expensed as incurred. We assess our property, plant and equipment to be held and used for impairment when indicators are present that the carrying value may not be recoverable.
Leases	Leases We determine if an arrangement is a lease at inception. For operating leases, we include and report operating lease right-of-use (“ROU”) assets, sundry payables and accrued expenses, and noncurrent operating lease liabilities on our consolidated balance sheet for leases with a term longer than twelve months. Finance leases are reported on our consolidated balance sheets in property, plant and equipment, current portion of other debt, and long-term debt. Operating lease ROU assets and operating lease liabilities are recognized at the lease commencement date based on the present value of the total lease payments over the lease term. Our ROU assets represent the right to use an underlying leased asset over the existing lease term, and the corresponding lease liabilities represent our obligation to make lease payments arising from the lease agreement. As most of our leases do not provide for an implicit rate, we use our incremental borrowing rate based on the information available when determining the present value of our lease payments. Our lease terms may include options to terminate, or extend, our lease when it is reasonably certain that we will execute the option. Lease agreements may contain lease and non-lease components, which are generally accounted for separately. Operating lease expense is recognized on a straight-line basis over the lease term.
Business Combinations and Intangible Assets Including Goodwill	Business Combinations and Intangible Assets Including Goodwill The company accounts for business combinations using the acquisition method and accordingly, the identifiable assets acquired, the liabilities assumed, and any noncontrolling interest in the acquiree are generally recorded at their acquisition date fair values. At acquisition, we estimate and record the fair value of purchased intangible assets, which primarily consist of customer relationships, trademarks and trade names, and patents, developed technology and intellectual property. Intangible assets acquired through business combinations are subject to potential adjustments within the measurement period, which is up to one year from the acquisition date. Valuing intangible assets requires the use of significant estimates and assumptions. Significant estimates and assumptions used in valuing customer relationships include but are not limited to: (i) forecasted revenues attributable to existing customers; (ii) forecasted margins; (iii) customer attrition rates; and (iv) the discount rate. Identifiable intangible assets with finite lives are amortized over their useful lives generally on a straight-line basis. Goodwill is the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. The primary drivers that generate goodwill are the value of synergies between the acquired entities and the company and the acquired assembled workforce, neither of which qualifies as a separately identifiable intangible asset. Goodwill and certain other intangible assets having indefinite lives are not amortized to earnings, but instead are subject to periodic testing for impairment. Intangible assets determined to have definite lives are amortized over their remaining useful lives. We believe that the fair value of acquired identifiable net assets, including intangible assets, are based upon reasonable estimates and assumptions. Acquisition related costs, including advisory, legal, accounting, valuation and pre-close and other costs, are typically expensed in the periods in which the costs are incurred and are recorded in selling, general and administrative expenses within the statement of operations. The results of operations of acquired businesses are included in the Consolidated Financial Statements from the acquisition date.
Impairment	Impairment We assess long‑lived assets, identifiable intangible assets and goodwill for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. With respect to goodwill and identifiable intangible assets having indefinite lives, we test for impairment on an annual basis or in interim periods if an event occurs or circumstances change that may indicate the fair value is below its carrying amount. Factors we consider important, which could trigger an impairment review, include the following: (a) significant underperformance relative to expected historical or projected future operating results; (b) significant changes in the manner of our use of the acquired assets or the strategy for our overall business; and (c) significant negative industry or economic trends. We review the fair values using the discounted cash flows method and market multiples. When performing our evaluation of goodwill for impairment, if we conclude qualitatively that it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then a quantitative impairment test would not be required. If we are unable to reach this conclusion, then we would perform a quantitative impairment test. In performing the quantitative impairment test, the fair value of the reporting unit is compared to its carrying amount. A charge for impairment is recognized by the amount by which the reporting unit’s carrying amount exceeds its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. Identifiable intangible assets having indefinite lives are reviewed for impairment on an annual basis using a methodology similar with that used to evaluate goodwill. Intangible assets having definite lives and other long-lived assets are reviewed for impairment whenever events such as product discontinuance, plant closures, product dispositions or other changes in circumstances indicate that the carrying amount may not be recoverable. In reviewing intangible assets having definite lives and other long-lived assets for impairment, we compare the carrying value of such assets to the estimated undiscounted future cash flows expected from the use of the assets and their eventual disposition. When the estimated undiscounted future cash flows are less than their carrying amount, an impairment loss is recognized equal to the difference between the assets fair value and their carrying value. There are inherent assumptions and estimates used in developing future cash flows requiring our judgment in applying these assumptions and estimates to the analysis of identifiable intangibles and long‑lived asset impairment including projecting revenues, interest rates, tax rates and the cost of capital. Many of the factors used in assessing fair value are outside our control and it is reasonably likely that assumptions and estimates will change in future periods. These changes can result in future impairments. In the event our planning assumptions were modified resulting in impairment to our assets, we would be required to include an expense in our statement of operations, which could materially impact our business, financial condition and results of operations.
Foreign Currency Translation	Foreign Currency Translation Assets and liabilities of our foreign operations are translated into U.S. dollars at year-end exchange rates. Income statement accounts are translated using the average exchange rates prevailing during the year. The resulting translation adjustments are recorded as a separate component of accumulated other comprehensive income (loss) and remain there until the underlying foreign operation is liquidated or substantially disposed of. Foreign currency transaction gains or losses are recorded in other non-operating income (expense), net in our statement of operations.
Revenue Recognition	Revenue Recognition We derive our revenue primarily from vehicle aftermarket sales in our Vehicle Control, Temperature Control and Nissens Automotive segments, and non-aftermarket sales in our Engineered Solutions Segment. We recognize revenues when our performance obligation has been satisfied and the control of products has been transferred to a customer which typically occurs upon shipment. Revenue is measured as the amount of consideration we expect to receive in exchange for the transfer of goods or provision of services. The amount of consideration we receive and revenue we recognize depends on the marketing incentives, product warranty and overstock returns we offer to our customers. For certain of our sales of remanufactured products, we also charge our customers a deposit for the return of a used core component which we can use in our future remanufacturing activities. Such deposit is not recognized as revenue at the time of the sale but rather carried as a core liability. At the same time, we estimate the core expected to be returned from the customer and record the estimated return as unreturned customer inventory. The liability is extinguished when a core is actually returned to us, or at period end when we estimate and recognize revenue for the core deposits not expected to be returned. We estimate and record provisions for cash discounts, quantity rebates, sales returns and warranties in the period the sale is recorded, based upon our prior experience and current trends. Significant management judgments and estimates are made in estimating sales returns and allowances relating to revenue recognized in any accounting period.
Product Warranty and Overstock Returns	Product Warranty and Overstock Returns Many of our products carry a warranty ranging from a 90-day limited warranty to a lifetime limited warranty, which generally covers defects in materials or workmanship and failure to meet industry published specifications and/or the result of installation error. In addition to warranty returns, we also permit our customers to return new, undamaged products to us within customer-specific limits (which are generally limited to a specified percentage of their annual purchases from us) in the event that they have overstocked their inventories. At the time products are sold, we accrue a liability for product warranties and overstock returns as a percentage of sales based upon estimates established using historical information on the nature, frequency and average cost of the claim and the probability of the customer return. At the same time, we record an estimate of anticipated customer returns as unreturned customer inventory. Significant judgments and estimates are made in connection with establishing the sales returns and other allowances in any accounting period. Revision to these estimates is made when necessary, based upon changes in these factors. We regularly study trends of such claims.
New Customer Acquisition Costs	New Customer Acquisition Costs New customer acquisition costs refer to arrangements pursuant to which we incur change-over costs to induce a new customer to switch from a competitor’s brand. In addition, change-over costs include the costs related to removing the new customer’s inventory and replacing it with our inventory commonly referred to as a stock lift. New customer acquisition costs are recorded as a reduction to revenue when incurred.
Selling, General and Administration Expenses	Selling, General and Administration Expenses Selling, general and administration expenses include shipping costs and advertising, which are expensed as incurred. Shipping and handling charges, as well as freight to customers, are included in distribution expenses as part of selling, general and administration expenses.
Accounting for Income Taxes	Accounting for Income Taxes Income taxes are calculated using the asset and liability method. Deferred tax assets and liabilities are determined based on the estimated future tax effects of temporary differences between the financial statement carrying amounts and the tax bases of assets and liabilities, as measured by the current enacted tax rates. We maintain valuation allowances when it is more likely than not that all or a portion of a deferred asset will not be realized. In determining whether a valuation allowance is warranted, we consider all positive and negative evidence and all sources of taxable income such as prior earnings history, expected future earnings, carryback and carryforward periods and tax strategies to estimate if sufficient future taxable income will be generated to realize the deferred tax asset. The assessment of the adequacy of our valuation allowance is based on our estimates of taxable income by jurisdiction in which we operate and the period over which our deferred tax assets will be recoverable. In the event that actual results differ from these estimates, or we adjust these estimates in future periods for current trends or expected changes in our estimating assumptions, we may need to modify the level of valuation allowance which could materially impact our business, financial condition and results of operations.
Asbestos Litigation	Asbestos Litigation 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: (i) historical data available from publicly available studies; (ii) an analysis of our recent claims history to estimate likely filing rates into the future; (iii) an analysis of our currently pending claims; (iv) an analysis of our settlements and awards of asbestos-related damages to date; and (v) 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. Future legal costs are expensed as incurred and reported in earnings (loss) from discontinued operations in the accompanying statement of operations. 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.
Loss Contingencies	Loss Contingencies We have loss contingencies, for such matters as legal claims and legal proceedings. Establishing loss reserves for these matters requires estimates, judgment of risk exposure and ultimate liability. We record provisions when the liability is considered probable and reasonably estimable. Significant judgment is required for both the determination of probability and the determination as to whether an exposure can be reasonably estimated. We maintain an ongoing monitoring and identification process to assess how the activities are progressing against the accrued estimated costs. As additional information becomes available, we reassess our potential liability related to these matters. Adjustments to the liabilities are recorded in the statement of operations in the period when additional information becomes available. Such revisions of the potential liabilities could have a material adverse effect on our business, financial condition or results of operations.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash investments, accounts receivable and derivative financial instruments used to reduce our market risk for changes in interest rates on our variable rate borrowings. We place our cash investments with high quality financial institutions and limit the amount of credit exposure to any one institution. Derivative financial instruments used to reduce our market risk for changes in interest rates on our variable rate borrowings are entered into with high quality financial institutions, with their credit worthiness reviewed on a quarterly basis. Although we are directly affected by developments in the vehicle parts industry, management does not believe significant credit risk exists. With respect to accounts receivable, such receivables are primarily from warehouse distributors and major retailers in the automotive aftermarket industry located in the U.S. We perform ongoing credit evaluations of our customers’ financial conditions. A significant portion of our net sales are concentrated from our three largest individual customers. The loss of one or more of these customers or, a significant reduction in purchases of our products from any one of them, could have a materially adverse impact on our business, financial condition and results of operations.
Foreign Cash Balances	Foreign Cash Balances Substantially all of the cash and cash equivalents, including foreign cash balances, at December 31, 2024 and 2023 were uninsured. Foreign cash balances at December 31, 2024 and 2023 were $42.5 million and $30.5 million , respectively.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities We occasionally use derivative financial instruments to reduce our market risk for changes in interest rates on our variable rate borrowings. Derivative financial instruments are recorded at fair value in other current and long-term assets, and other current and long-term liabilities in the consolidated balance sheets. For derivative financial instruments that have been formally designated as cash flow hedges, provided that the hedging instrument is highly effective, the entire change in the fair value of the derivative will be deferred and recorded in accumulated other comprehensive income (“AOCI”) in the consolidated balance sheets. When the underlying hedged transaction is realized (i.e., when the interest payments on the underlying borrowing are recognized in the consolidated statements of operations), the gain/loss included in AOCI is recorded in earnings and reflected on the same line as the gain/loss on the hedged item attributable to the hedged risk (i.e., interest expense for cash flow hedges of interest rate risk). At the inception of each transaction, we formally document the hedge relationship, including the identification of the hedge instrument, the related hedged items, the effectiveness of the hedge, as well as its risk management objectives and strategies.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the Financial Accounting Standards Board (FASB) issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This accounting standards update improves segment disclosure requirements, primarily through expanding the disclosures to include significant segment expenses incurred by the business. To achieve these disclosures the following items are required by ASU 2023-07: (i) 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; (ii) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (iii) 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. This ASU is effective for fiscal years beginning after December 15, 2023 and as such we have expanded our disclosures in Note 21, "Industry Segment and Geographic Data ," of the notes to our consolidated financial statements and recast comparative periods . Standards that are not yet adopted as of December 31, 2024 ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures. This accounting standards update will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required income effective tax rate reconciliation disclosures to include disclosure of (i) eight specific categories of rate reconciling items; (ii) additional information for reconciling items that meet or exceed a quantitative threshold; and (iii) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, ASU 2023-09 will expand required interim and annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions, with expanded disclosures required annually. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is January 1, 2025, with full retrospective application required to all prior periods presented. Early adoption is permitted. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. We will adopt the guidance when it becomes effective. ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40) In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40). This accounting standards update seeks to provide investors and users of the financial statements with clearer information regarding companies' cost structures by disaggregating expense line items in the income statement. ASU 2024-03 requires the following disclosures, in tabular format in the notes to the financial statements for public business entities, at each interim and annual reporting period: (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, (e) depreciation, depletion, and amortization recognized as part of oil and gas producing activities that are already included in each relevant expense caption. The ASU defines a relevant expense caption as an expense caption presented on the face of the income statement within continuing operations that contains any of the expense categories listed in (a)–(e). Furthermore, the ASU requires the disclosure table to include (i) certain amounts that are already required to be disclosed under U.S. GAAP in the same disclosure as the other disaggregation requirements, (ii) a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and (iii) the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027, which for us is January 1, 2027 and January 1, 2028, respectively. The requirements will be applied prospectively with the option for retrospective application. Early adoption is permitted. This new standard, once adopted, will require us to disclose expenses in a more detailed and granular way than we do in these consolidated financial statements. We are currently evaluating the full impact of adopting ASU 2024-03 on our consolidated financial statements, disclosures, processes and controls. We will adopt the guidance when it becomes effective. 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.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Schedule of Estimated Useful Lives of Property, Plant and Equipment	Property, plant and equipment are recorded at historical cost and are depreciated using the straight-line method of depreciation over the estimated useful lives as follows: Estimated Life Buildings 25 to 33-1/2 years Building improvements 10 to 25 years Machinery and equipment 5 to 12 years Tools, dies and auxiliary equipment 3 to 8 years Furniture and fixtures 3 to 12 years December 31, (In thousands) 2024 2023 Land, buildings and improvements $ 68,356 $ 45,710 Machinery and equipment 186,902 177,337 Tools, dies and auxiliary equipment 78,934 73,494 Furniture and fixtures 37,400 33,212 Leasehold improvements 18,991 16,418 Construction-in-progress 51,416 35,357 Total property, plant and equipment 441,999 381,528 Less accumulated depreciation 273,264 259,656 Total property, plant and equipment, net $ 168,735 $ 121,872 Depreciation expense was $20.6 million in 2024 , $19.7 million in 2023 and $19 million

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the allocation of the acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (a) $ 397,111 Cash and cash equivalents 24,620 Accounts receivable 48,460 Inventories 88,337 Unreturned customer inventories 1,820 Prepaid expenses and other current assets 1,033 Property, plant and equipment 29,048 Operating lease right-of-use assets 8,625 Customer relationships intangibles (c) 150,400 Other intangibles (c) 78,871 Other assets 407 Total assets acquired 431,621 Current portion of term loan and other debt 1,749 Accounts payable 34,568 Sundry payables and accrued expenses 19,836 Accrued customer returns 3,360 Accrued rebates 24,732 Payroll and commissions 3,294 Long-term debt 14,423 Noncurrent operating lease liabilities 5,501 Other accrued liabilities 1,371 Deferred tax liabilities 37,870 Total liabilities assumed 146,704 Net assets acquired 284,917 Goodwill (b) $ 112,194 (a) Total purchase consideration is the cash paid of $397.1 million for the acquisition. (b) Goodwill is deductible for tax purposes (c) Intangible assets comprise of capitalized computer software of $2.2 million and the following preliminary valuation of identifiable intangible assets (in thousands): Gross Carrying Amount Weighted-Average Useful Life (in Years) Customer relationships $ 150,400 16 Trade names - Nissens & AVA 75,600 Indefinite Trade names - Highway 1,100 15 Other intangibles $ 227,100 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 Inventories 5,945 Other current assets 528 Property, plant and equipment 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 that will be amortized on a straight-line basis over the estimated useful life of 10 years and capitalized software of $0.1 million.
Schedule of Business Acquisition Pro Forma Information	Year Ended December 31, 2024 2023 Net sales $ 1,704,858 $ 1,615,110 Net earnings attributable to SMP 39,907 18,870

Restructuring and Integration_2

Restructuring and Integration Expenses (Tables)	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Integration Expenses	Activity for year ended December 31, 2024 related to the separation program workforce reduction consisted of the following (in thousands): Exit activity liability at December 31, 2023 $ — Restructuring and integration costs: Amounts provided for during 2024 (a) 7,116 Cash payments (2,485) Stock-based compensation 150 Foreign currency translation (5) Exit activity liability at December 31, 2024 $ 4,776 (a) Restructuring and integration expenses incurred during the year ended December 31, 2024 consist of $3.8 million in our Vehicle Control segment, $0.8 million in our Temperature Control segment, $0.8 million in our Engineered Solutions segment and $1.7 million in our Other segment. Activity for the year ended ended December 31, 2024 related to the cost reduction initiative consisted of the following (in thousands): Workforce Reduction Other Exit Costs Total Exit activity liability at December 31, 2022 $ 1,521 $ — $ 1,521 Restructuring and integration costs: Amounts provided for during 2023 (a) 1,973 669 2,642 Cash payments (a) (1,803) (577) (2,380) Reclassification of environmental liability — (92) (92) Foreign currency translation 38 — 38 Exit activity liability at December 31, 2023 $ 1,729 $ — $ 1,729 Restructuring and integration costs: Amounts provided for during 2024 (b) 163 389 552 Cash payments (1,632) (389) (2,021) Foreign currency translation (28) — (28) Exit activity liability at December 31, 2024 $ 232 $ — $ 232 (a) Includes $0.1 million of integration expenses recognized and cash payments made for the Particulate Matter Sensor Product Line Relocation program related to the relocation of inventory and equipment in connection with the 2021 acquisitions of certain product lines. The program was completed in 2022. (b) Restructuring and integration expenses incurred during the year ended December 31, 2024 consist of $0.4 million in our Vehicle Control segment, $0.1 million in our Temperature Control segment and an immaterial amount in our Engineered Solutions segment.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	December 31, (In thousands) 2024 2023 Finished goods $ 394,852 $ 302,557 Work-in-process 22,053 18,503 Raw materials 208,008 186,015 Subtotal 624,913 507,075 Unreturned customer inventories 16,163 18,240 Total inventories $ 641,076 $ 525,315

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment are recorded at historical cost and are depreciated using the straight-line method of depreciation over the estimated useful lives as follows: Estimated Life Buildings 25 to 33-1/2 years Building improvements 10 to 25 years Machinery and equipment 5 to 12 years Tools, dies and auxiliary equipment 3 to 8 years Furniture and fixtures 3 to 12 years December 31, (In thousands) 2024 2023 Land, buildings and improvements $ 68,356 $ 45,710 Machinery and equipment 186,902 177,337 Tools, dies and auxiliary equipment 78,934 73,494 Furniture and fixtures 37,400 33,212 Leasehold improvements 18,991 16,418 Construction-in-progress 51,416 35,357 Total property, plant and equipment 441,999 381,528 Less accumulated depreciation 273,264 259,656 Total property, plant and equipment, net $ 168,735 $ 121,872 Depreciation expense was $20.6 million in 2024 , $19.7 million in 2023 and $19 million

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Schedule of Lessee 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 the acquisition (in thousands, except where otherwise indicated): Year Ended December 31, Balance Sheet Information 2024 2023 Assets Operating lease right-of-use assets $ 109,899 $ 100,065 Liabilities Sundry payables and accrued expenses $ 19,992 $ 17,139 Noncurrent operating lease liabilities 98,214 88,974 Total operating lease liabilities $ 118,206 $ 106,113 Weighted Average Remaining Lease Term 7.7 years 8.3 years Weighted Average Discount Rate 5.0 % 4.8%
Schedule of Components of Lease Expense and Supplemental Cash Flow Information	Year Ended December 31, 2024 2023 Lease Expense Operating lease expense $ 19,993 $ 16,434 Variable and other lease expense (a) 3,907 3,272 Total lease costs $ 23,900 $ 19,706 (a) Variable and other lease expense relate 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 are not material. Year Ended December 31, 2024 2023 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities $ 18,365 $ 12,099 Right-of-use assets obtained in exchange for new lease obligations (a) $ 17,873 $ 66,014 (a) During the year ended December 31, 2024 includes $4.7 million of right-of-use assets related to the lease modification and extension for our manufacturing facility in Bialystok, Poland and $10.8 million
Schedule of Lessee, Operating Lease, Liability, to be Paid, Maturity	At December 31, 2024, we are obligated to make minimum lease payments through 2034 , under operating leases, which are as follows (in thousands): 2025 $ 20,889 2026 19,169 2027 16,906 2028 14,579 2029 13,990 Thereafter 59,220 Total lease payments 144,753 Less: Interest (26,547) Present value of lease liabilities $ 118,206

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Value of Goodwill by Operating Segment	Changes in the carrying values of goodwill by reporting unit during the years ended December 31, 2024 and 2023 are as follows (in thousands): Vehicle Temperature Control Engineered Nissens Automotive Total Balance as of December 31, 2022: Goodwill $ 129,008 $ 11,474 $ 30,093 $ — $ 170,575 Accumulated impairment losses (38,488) — — — (38,488) 90,520 11,474 30,093 — 132,087 Activity in 2023 Step acquisition of Gwo Yng — 1,214 994 — 2,208 Foreign currency translation 286 42 106 — 434 Balance as of December 31, 2023: Goodwill 129,294 12,730 31,193 — 173,217 Accumulated impairment losses (38,488) — — — (38,488) $ 90,806 $ 12,730 $ 31,193 $ — $ 134,729 Activity in 2024 Acquisition of Nissens Automotive — — — 112,194 112,194 Foreign currency translation (384) (62) (144) (4,915) (5,505) Balance as of December 31, 2024: Goodwill $ 128,910 $ 12,668 $ 31,049 $ 107,279 $ 279,906 Accumulated impairment losses (38,488) — — — (38,488) $ 90,422 $ 12,668 $ 31,049 $ 107,279 $ 241,418
Schedule of Acquired Identifiable Intangible Assets	Acquired identifiable intangible assets as of December 31, 2024 and 2023 consist of (in thousands): December 31, 2024 2023 Customer relationships 303,547 159,641 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 82,220 8,880 Non-compete agreements 3,308 3,295 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets $ 404,158 $ 186,899 Less accumulated amortization(a) (106,304) (95,681) Net acquired intangible assets $ 297,854 $ 91,218 (a) Applies to all intangible assets, except for trademarks/trade names totaling $74.9 million , which have indefinite useful lives and, as such, are not being amortized.
Schedule of Estimated Amortization Expenses in Future Period Based on the Current Estimated Useful Lives	The following table summarizes the amortization expense on our intangible assets and the estimated amortization expenses in future periods based on the current estimated useful lives assigned to our intangible assets (in thousands): Amortization Expense (a) 2025 17,500 2026 17,500 2027 17,500 2028 17,500 2029-2041 153,000 (a) Estimated amortization expenses based on the current estimated useful lives assigned to our intangible assets

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	12 Months Ended
	Dec. 31, 2024
Investments in and Advances to Affiliates [Abstract]
Schedule of Investments in Unconsolidated Affiliates	December 31, (in thousands) 2024 2023 Foshan FGD SMP Automotive Compressor Co. Ltd. $ 19,994 $ 18,426 Foshan Che Yijia New Energy Technology Co., Ltd. 2,401 3,128 Orange Electronic Co. Ltd 2,447 2,496 Total $ 24,842 $ 24,050

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Other Assets [Abstract]
Schedule of Other Assets	December 31, (in thousands) 2024 2023 Deferred compensation $ 26,333 $ 23,893 Long-term investments 92 7,468 Noncurrent portion of interest rate swap fair value 3,991 1,944 Deferred financing costs, net 1,702 1,125 Other 1,021 837 Total other assets, net $ 33,139 $ 35,267

Credit Facilities and Long-Te_2

Credit Facilities and Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Debt	Total debt outstanding is summarized as follows (in thousands): December 31, 2024 2023 2022 Credit Agreement: Revolver $ — $ 63,500 Term loan — 92,500 2024 Credit Agreement: Multi-currency revolver 244,171 — U.S. dollar term loan(a) 198,287 — Euro term loan(a) 102,908 — Other 16,948 211 Total debt $ 562,314 $ 156,211 Current maturities of debt $ 27,117 $ 5,029 Long-term debt 535,197 151,182 Total debt $ 562,314 $ 156,211
Schedule of Maturities of Long-Term Debt	As of December 31, 2024, maturities of debt through 2038 , assuming no prepayments, are as follows (in thousands): Multi-Currency Revolver U.S. Dollar Term Loan Euro Term Loan Other Debt Total 2025 $ 10,800 $ 9,516 $ 4,923 $ 1,878 $ 27,117 2026 — 9,606 4,973 1,146 15,725 2027 — 14,655 7,598 1,238 23,491 2028 — 19,703 10,221 1,177 31,101 2029 233,371 144,807 75,193 1,214 454,585 Thereafter — — — 10,295 10,295 Total $ 244,171 $ 198,287 $ 102,908 $ 16,948 $ 562,314 Less: current maturities (10,800) (9,516) (4,923) (1,878) (27,117) Long-term debt $ 233,371 $ 188,771 $ 97,985 $ 15,070 $ 535,197

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income Attributable to SMP (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive by Component	Changes in Accumulated Other Comprehensive Income by Component (in thousands): Foreign Currency Translation Cash Flow Hedges Postretirement Benefit Plans Total Balance at December 31, 2022 $ (16,330) $ 3,823 $ 37 $ (12,470) Other comprehensive income before reclassifications 7,433 831 (a) — 8,264 Amounts reclassified from accumulated other comprehensive income — (2,372) (b) (22) (c) (2,394) Net other comprehensive income (loss) 7,433 (1,541) (22) 5,870 Tax amounts — 617 9 626 Balance at December 31, 2023 $ (8,897) $ 2,899 $ 24 $ (5,974) Other comprehensive income before reclassifications (23,385) 2,893 (a) — (20,492) Amounts reclassified from accumulated other comprehensive income — (2,524) (b) (18) (c) (2,542) Net other comprehensive income (loss) (23,385) 369 (18) (23,034) Tax amounts 2,513 656 7 3,176 Balance at December 31, 2024 $ (29,769) $ 3,924 $ 13 $ (25,832) (a) Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedges of $1.4 million ($1.0 million, net of tax) plus cash settlement receipts of $2.5 million ($1.9 million, net of tax) in the year ended December 31, 2024; and the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $1.2 million ($0.9 million, net of tax) plus cash settlement receipts of $2.4 million ($1.7 million, net of tax) in the year ended December 31, 2023. (b) 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. (c) 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.

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Stock-Based Compensation Expenses	The following table shows stock-based compensation unamortized compensation expense and the weighted-average periods over which the unamortized compensation expense is expected to be recognized: Year ended December 31, (in millions, except years) 2024 2023 2022 Unamortized compensation expense $ 13.5 $ 13.3 $ 14.9 Expected period to be recognized for employees 3.7 years 4.1 years 4.3 years Expected period to be recognized for directors 0.3 years 0.3 years 0.3 years
Schedule of Share-Based Payment Arrangement, Restricted Stock and Performance-Based Share Activity	Our restricted and performance-based share activity was as follows for the years ended December 31, 2024 and 2023: Shares Weighted Average Grant Date Fair Value per Share Balance at December 31, 2022 880,829 $ 31.79 Granted 230,875 27.00 Vested (248,065) 36.30 Performance Shares Target Adjustment 29,137 36.30 Forfeited (11,800) 35.36 Balance at December 31, 2023 880,976 $ 29.48 Granted 277,742 24.25 Vested (181,430) 34.46 Performance Shares Target Adjustment (14,247) 39.28 Forfeited (34,017) 29.83 Balance at December 31, 2024 929,024 $ 26.82

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of Defined Contribution Plan Matching Obligations	We maintain various defined contribution plans, which include profit sharing, and provide retirement benefits for substantially all of our employees. Matching obligations, in connection with the plans which are funded in cash and typically contributed to the plans in March of the following year, are as follows (in thousands): U.S. Defined Contribution Year ended December 31, 2024 $ 10,314 2023 10,510 2022 10,180

Other Non-Operating Income, N_2

Other Non-Operating Income, Net (Tables)	12 Months Ended
	Dec. 31, 2024
Other Income and Expenses [Abstract]
Schedule of Other Non-Operating Income, Net	The components of other non-operating income, net are as follows (in thousands): Year Ended December 31, 2024 2023 2022 Interest and dividend income $ 871 $ 517 $ 209 Equity income from joint ventures 4,274 2,070 3,464 Gain (loss) on foreign exchange 1,228 (776) 334 Other non-operating income, net 504 515 807 Total other non-operating income, net $ 6,877 $ 2,326 $ 4,814

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule 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 December 31, 2024 and December 31, 2023 (in thousands): December 31, 2024 December 31, 2023 Fair Value Hierarchy Fair Value Carrying Amount Fair Value Carrying Amount Cash and cash equivalents (a) Level 1/2 $ 44,426 $ 44,426 $ 32,526 $ 32,526 Deferred compensation Level 1 26,333 26,333 23,893 23,893 Short-term investments Level 2 6,956 6,956 — — Long-term investments Level 2 93 93 7,468 7,468 Cash flow hedge interest rate swaps Level 2 5,409 5,409 3,939 3,939 Short term borrowings Level 1 27,117 27,117 5,029 5,029 Long-term debt Level 1 535,197 535,197 151,182 151,182 (a) As of December 31, 2024 cash and cash equivalents consist of cash of $44.4 million. Ca sh and cash equivalents at December 31, 2023 consist of cash of $29.5 million and cash equivalents of $3 million

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Income Tax Provision (Benefit)	The income tax provision (benefit) consists of the following (in thousands): Year Ended December 31, 2024 2023 2022 Current: Domestic $ 19,761 $ 15,422 $ 16,182 Foreign 11,254 9,224 8,669 Total current 31,015 24,646 24,851 Deferred: Domestic (9,536) (5,769) 1,102 Foreign (2,094) (509) (747) Total deferred (11,630) (6,278) 355 Total income tax provision $ 19,385 $ 18,368 $ 25,206
Schedule of Effective Income Tax Rate Reconciliation	Reconciliations between taxes at the U.S. Federal income tax rate and taxes at our effective income tax rate on earnings from continuing operations before income taxes are as follows (in thousands): Year Ended December 31, 2024 2023 2022 U.S. Federal income tax rate of 21% $ 15,538 $ 17,160 $ 20,650 Increase (decrease) in tax rate resulting from: State and local income taxes, net of federal income tax benefit 1,922 2,086 3,118 Change in valuation allowance 770 674 1,068 Income tax (benefit) attributable to foreign income 4,370 377 (53) Other non-deductible items, net (3,215) (1,929) 423 Provision for income taxes $ 19,385 $ 18,368 $ 25,206
Schedule of Components of Net Deferred Tax Assets and Liabilities	The following is a summary of the components of the net deferred tax assets and liabilities recognized in the accompanying consolidated balance sheets (in thousands): December 31, 2024 2023 Deferred tax assets: Inventories $ 9,087 $ 10,493 Allowance for customer returns 17,854 13,083 Accrued asbestos liabilities 24,032 20,758 Accrued salaries and benefits 13,564 11,816 Tax credit and net operating loss carryforwards 5,690 5,968 Allowance for expected credit losses 3,586 3,567 Other 10 17 73,823 65,702 Valuation allowance (4,849) (3,830) Total deferred tax assets 68,974 61,872 Deferred tax liabilities: Intangible assets acquired, net of amortization 43,755 12,668 Depreciation 6,669 7,597 Interest rate swap agreement 1,345 990 Other 4,006 84 Total deferred tax liabilities 55,775 21,339 Net deferred tax assets $ 13,199 $ 40,533

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of Net Earnings Attributable to SMP and the 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 attributable to SMP (in thousands, except share and per share data): Year Ended December 31, 2024 2023 2022 Net earnings (loss) attributable to SMP Continuing operations 53,628 63,144 73,042 Discontinued operations (26,128) (28,996) (17,691) Net earnings attributable to SMP $ 27,500 $ 34,148 $ 55,351 Basic net earnings (loss) per common share attributable to SMP Continuing operations $ 2.46 $ 2.91 $ 3.37 Discontinued operations $ (1.20) $ (1.34) $ (0.82) Diluted net earnings (loss) per common share attributable to SMP Continuing operations $ 2.41 $ 2.85 $ 3.30 Discontinued operations $ (1.17) $ (1.31) $ (0.80) Weighted average number of common shares, basic 21,801,141 21,716,177 21,683,719 Dilutive effect of restricted stock and performance-based stock 435,919 445,164 456,262 Weighted average number of common shares, diluted 22,237,060 22,161,341 22,139,981
Schedule of 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): 2024 2023 2022 Restricted and performance shares 285 280 292

Industry Segment and Geograph_2

Industry Segment and Geographic Data (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Sales and Operating Income by Operating Segments	Year ended December 31, 2024 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total Net sales $ 762,560 $ 380,088 $ 285,456 $ 35,745 $ — $ 1,463,849 Cost of sales 518,475 262,296 235,537 24,220 — 1,040,528 Gross profit 244,085 117,792 49,919 11,525 — 423,321 Selling and marketing expenses 45,878 15,938 8,060 1,536 — 71,412 Distribution expenses 57,627 32,858 5,290 7,097 4,579 107,451 General and administration expenses 36,935 16,763 20,906 5,560 17,052 97,216 Supply chain financing expenses 32,090 16,449 — — — 48,539 Restructuring and integration expenses 4,249 847 843 — 1,729 7,668 Other expenses — — — 100 10,311 10,411 Total operating expenses 176,779 82,855 35,099 14,293 33,671 342,697 Operating income (loss) $ 67,306 $ 34,937 $ 14,820 $ (2,768) $ (33,671) $ 80,624 Other non-operating income, net 6,877 Interest expense 13,512 Earnings from continuing operations before income taxes $ 73,989 Year ended December 31, 2023 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total Net sales $ 737,932 $ 337,754 $ 282,586 $ — $ — $ 1,358,272 Cost of sales 499,717 241,927 227,802 — — 969,446 Gross profit 238,215 95,827 54,784 — — 388,826 Selling and marketing expenses 46,223 16,772 8,407 — — 71,402 Distribution expenses 54,401 30,467 4,989 — — 89,857 General and administration expenses 34,430 14,664 21,186 — 15,937 86,217 Supply chain financing expenses 30,558 15,473 — — — 46,031 Restructuring and integration expenses 1,276 1,108 258 — — 2,642 Other expenses — — — — — — Total operating expenses 166,888 78,484 34,840 — 15,937 296,149 Operating income (loss) $ 71,327 $ 17,343 $ 19,944 $ — $ (15,937) $ 92,677 Other non-operating income, net 2,326 Interest expense 13,287 Earnings from continuing operations before income taxes $ 81,716 Year ended December 31, 2022 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total Net sales $ 750,571 $ 351,237 $ 270,007 $ — $ — $ 1,371,815 Cost of sales 518,304 252,323 218,649 — — 989,276 Gross profit 232,267 98,914 51,358 — — 382,539 Selling and marketing expenses 49,245 17,666 7,239 — — 74,150 Distribution expenses 54,081 29,868 4,377 — — 88,326 General and administration expenses 31,812 13,969 21,029 — 15,190 82,000 Supply chain financing expenses 21,480 10,557 — — — 32,037 Restructuring and integration expenses 1,496 395 — — — 1,891 Other expenses — — — — — — Total operating expenses 158,114 72,455 32,645 — 15,190 278,404 Operating income (loss) $ 74,153 $ 26,459 $ 18,713 $ — $ (15,190) $ 104,135 Other non-operating income, net 4,814 Interest expense 10,617 Earnings from continuing operations before income taxes $ 98,332
Schedule of Reconciliation of Segment Operating Income to Net Earnings	Year Ended December 31, 2024 2023 2022 Depreciation and amortization Vehicle Control $ 14,841 $ 13,877 $ 14,075 Temperature Control 3,307 3,424 2,973 Engineered Solutions 9,608 9,966 9,557 Nissens Automotive 1,943 — — Other 1,714 1,755 1,693 Total depreciation and amortization $ 31,413 $ 29,022 $ 28,298 Investment in unconsolidated affiliates Vehicle Control $ 2,447 $ 2,496 $ 2,490 Temperature Control 20,396 19,711 27,557 Engineered Solutions 1,999 1,843 11,698 Nissens Automotive — — Other — — — Total investment in unconsolidated affiliates $ 24,842 $ 24,050 $ 41,745 Capital expenditures Vehicle Control $ 29,603 $ 13,955 $ 13,378 Temperature Control 2,621 1,899 3,973 Engineered Solutions 9,721 12,095 6,489 Nissens Automotive 213 — — Other 1,860 684 2,116 Total capital expenditures $ 44,018 $ 28,633 $ 25,956 Total assets Vehicle Control $ 659,607 $ 620,569 $ 618,789 Temperature Control 276,216 274,657 254,137 Engineered Solutions 285,866 292,080 289,518 Nissens Automotive 482,773 — — Other 109,664 105,741 92,485 Total assets $ 1,814,126 $ 1,293,047 $ 1,254,929
Schedule of Long-lived Assets by Geographical Areas	December 31, (in thousands) 2024 2023 2022 Long-lived assets (a) United States $ 378,557 $ 368,792 $ 326,199 Denmark 347,629 — — Asia 67,406 75,869 76,766 Europe 59,909 $ 44,517 $ 38,351 Mexico 21,173 13,262 10,355 Canada 4,329 5,851 7,161 Total long-lived assets $ 879,003 $ 508,291 $ 458,832 (a) Long-lived assets are attributed to countries based upon the location of the assets.

Net Sales (Tables)

Net Sales (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Net Sales	The following table summarizes consolidated net sales by major product group within each operating segment for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, 2024 2023 2022 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 467,460 $ 450,180 $ 454,571 Electrical and Safety 229,361 221,782 230,487 Wire Sets and Other 65,739 65,970 65,513 Total Vehicle Control 762,560 737,932 750,571 Temperature Control AC System Components 274,926 237,756 245,484 Other Thermal Components 105,162 99,998 105,753 Total Temperature Control 380,088 337,754 351,237 Engineered Solutions Commercial Vehicle 89,171 79,376 80,275 Construction/Agriculture 35,832 41,665 42,385 Light Vehicle 91,548 92,701 91,533 All Other 68,905 68,844 55,814 Total Engineered Solutions 285,456 282,586 270,007 Nissens Automotive Engine Cooling 19,287 — — Air Conditioning 9,214 — — Engine Efficiency 7,244 — — Total Nissens Automotive 35,745 — — Other — — — Total $ 1,463,849 $ 1,358,272 $ 1,371,815 The following tables provide disaggregation of net sales information by geographic area within each operating segment for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, 2024 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total United States $ 677,779 $ 360,858 $ 154,960 $ 2,213 $ — $ 1,195,810 Europe 1,118 176 53,682 31,757 — 86,733 Canada 37,683 16,707 31,027 82 — 85,499 Mexico 40,555 171 9,138 14 — 49,878 Asia 330 1,741 33,508 1,098 — 36,677 Other foreign 5,095 435 3,141 581 — 9,252 Total $ 762,560 $ 380,088 $ 285,456 $ 35,745 $ — $ 1,463,849 Year Ended December 31, 2023 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total United States $ 659,570 $ 319,904 $ 168,878 $ — $ — $ 1,148,352 Canada 36,088 17,081 25,689 — — 78,858 Europe 916 8 59,266 — — 60,190 Mexico 36,350 49 6,658 — — 43,057 Asia 351 526 19,522 — — 20,399 Other foreign 4,657 186 2,573 — — 7,416 Total $ 737,932 $ 337,754 $ 282,586 $ — $ — $ 1,358,272 Year Ended December 31, 2022 Vehicle Control Temperature Control Engineered Solutions Nissens Automotive Other Total United States $ 682,145 $ 335,281 $ 191,678 $ — $ — $ 1,209,104 Canada 35,233 14,596 16,762 — — 66,591 Europe 661 75 37,784 — — 38,520 Mexico 26,019 401 4,897 — — 31,317 Asia 2,408 63 16,715 — — 19,186 Other foreign 4,105 821 2,171 — — 7,097 Total $ 750,571 $ 351,237 $ 270,007 $ — $ — $ 1,371,815

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Changes in Product Warranties	The following table provides the changes in our product warranties (in thousands): December 31, 2024 2023 Balance, beginning of period $ 21,134 $ 19,667 Liabilities accrued for current year sales 134,831 120,027 Settlements of warranty claims (131,249) (118,560) Balance, end of period $ 24,715 $ 21,134

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of aftermarket segments | segment	3
Number of operating segments | segment	4
Inventory reserve | $	$ 43.7	$ 42.9
Product warranty period	90 days
Foreign cash balance | $	$ 42.5	$ 30.5

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Property, Plant and Equipment (Details)	Dec. 31, 2024
Buildings | Minimum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	25 years
Buildings | Maximum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	33 years 6 months
Building improvements | Minimum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	10 years
Building improvements | Maximum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	25 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	12 years
Tools, dies and auxiliary equipment | Minimum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	3 years
Tools, dies and auxiliary equipment | Maximum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	8 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Abstract]
Property, plant and equipment, useful life	12 years

Business Combinations - Narrati

Business Combinations - Narrative (Details) $ in Thousands, € in Millions			1 Months Ended		12 Months Ended
	Nov. 01, 2024 USD ($)	Nov. 01, 2024 EUR (€)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 241,418	$ 134,729	$ 132,087
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd.
Business Acquisition [Line Items]
Equity method investment, ownership percentage			65%
Nissens Automotive
Business Acquisition [Line Items]
Total purchase consideration	$ 397,111	€ 366.8
Acquisition related costs					8,000
Pro forma net income (loss) adjustment					18,870	39,907
Goodwill	$ 112,194
Nissens Automotive | Amortization and Depreciation
Business Acquisition [Line Items]
Pro forma net income (loss) adjustment					(3,400)	(4,100)
Nissens Automotive | Amortization For Financing Costs
Business Acquisition [Line Items]
Pro forma net income (loss) adjustment					$ (14,500)	(18,200)
Nissens Automotive | Fair Value Adjustment to Inventory
Business Acquisition [Line Items]
Pro forma net income (loss) adjustment						(9,400)
Nissens Automotive | Acquisition-related Costs
Business Acquisition [Line Items]
Pro forma net income (loss) adjustment						(1,600)
Nissens Automotive | Employee Retention Bonus Expense
Business Acquisition [Line Items]
Pro forma net income (loss) adjustment						$ (1,800)
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd.
Business Acquisition [Line Items]
Total purchase consideration			$ 21,725
Step acquisition, equity interest in acquiree, subsequent acquisition			15%	15%
Payment to acquire business			$ 4,000	¥ 27,378,290
Step acquisition, equity interest in acquiree, including subsequent acquisition, percentage			80%
Goodwill			$ 2,208
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. | Temperature Control Segment
Business Acquisition [Line Items]
Goodwill			1,200
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. | Engineered Solutions Segment
Business Acquisition [Line Items]
Goodwill			$ 1,000

Business Combinations - Schedul

Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) $ in Thousands, € in Millions			1 Months Ended
	Nov. 01, 2024 USD ($)	Nov. 01, 2024 EUR (€)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Assets acquired and liabilities assumed:
Goodwill					$ 241,418	$ 134,729	$ 132,087
Nissens Automotive
Investments in and Advances to Affiliates, Balance [Abstract]
Total purchase consideration	$ 397,111	€ 366.8
Assets acquired and liabilities assumed:
Cash and cash equivalents	24,620
Accounts receivable	48,460
Inventories	88,337
Unreturned customer inventories	1,820
Prepaid expenses and other current assets	1,033
Property, plant and equipment	29,048
Operating lease right-of-use assets	8,625
Other intangibles	78,871
Other current assets	407
Total assets acquired	431,621
Current portion of term loan and other debt	1,749
Accounts payable	34,568
Sundry payables and accrued expenses	19,836
Accrued customer returns	3,360
Accrued rebates	24,732
Payroll and commissions	3,294
Long-term debt	14,423
Noncurrent operating lease liabilities	5,501
Other accrued liabilities	1,371
Deferred tax liabilities	37,870
Goodwill	112,194
Total liabilities assumed	146,704
Net assets acquired	284,917
Nissens Automotive | Customer relationships
Assets acquired and liabilities assumed:
Finite-lived intangible assets	150,400
Nissens Automotive | Trade names - Highway
Assets acquired and liabilities assumed:
Finite-lived intangible assets	1,100
Nissens Automotive | Computer software
Assets acquired and liabilities assumed:
Valuation of identifiable intangible assets and capitalized computer software	$ 2,200
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd.
Investments in and Advances to Affiliates, Balance [Abstract]
Total purchase consideration			$ 21,725
Assets acquired and liabilities assumed:
Cash and cash equivalents			6,779
Accounts receivable			5,912
Inventories			5,945
Property, plant and equipment			2,924
Operating lease right-of-use assets			4,372
Finite-lived intangible assets			532
Other current assets			528
Long term investments and other assets			7,257
Goodwill			2,208
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
Business combination, step acquisition, equity interest in acquiree, fair value			17,700
Payment to acquire business			$ 4,000	¥ 27,378,290
Step acquisition, equity interest in acquiree, subsequent acquisition			15%	15%
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. | Customer relationships
Assets acquired and liabilities assumed:
Finite-lived intangible assets			$ 400
Finite-lived intangible asset, useful life			10 years
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. | Computer software
Assets acquired and liabilities assumed:
Finite-lived intangible assets			$ 100

Business Combinations - Asset A

Business Combinations - Asset Acquisitions, and Joint Venture Formation (Details) - Nissens Automotive $ in Thousands	Nov. 01, 2024 USD ($)
Business Acquisition [Line Items]
Other intangibles	$ 227,100
Trade names - Nissens & AVA
Business Acquisition [Line Items]
Indefinite-lived intangible assets	75,600
Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 150,400
Weighted-Average Useful Life (in Years)	16 years
Trade names - Highway
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 1,100
Weighted-Average Useful Life (in Years)	15 years

Business Combinations - Sched_2

Business Combinations - Schedule of Business Acquisition Pro Forma Information (Details) - Nissens Automotive - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Net sales	$ 1,615,110	$ 1,704,858
Net earnings attributable to SMP	$ 18,870	$ 39,907

Restructuring and Integration_3

Restructuring and Integration Expenses - Narrative (Details) $ in Millions	Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring expenses incurred	$ 4.6
Separation Program
Restructuring Cost and Reserve [Line Items]
Expected cost remaining, 2025	0.6
Expected cost remaining, 2026	0.1
Expected cost remaining, 2027	0
Expected restructuring costs	$ 7.7

Restructuring and Integration_4

Restructuring and Integration Expenses - Schedule of Related to the Separation Program Workforce Reduction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	$ 7,668	$ 2,642	$ 1,891
Other
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	1,729	0	0
Separation Program
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period	0
Amounts provided for during year	7,116
Cash payments	(2,485)
Stock-based compensation	150
Foreign currency translation	(5)
Exit activity liability, end of period	4,776	0
Separation Program | Other
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	1,700
Separation Program | Vehicle Control Segment | Operating Segments
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	3,800
Separation Program | Temperature Control Segment | Operating Segments
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	800
Separation Program | Engineered Solutions Segment | Operating Segments
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	800
Cost Reduction Initiative
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period	1,729	1,521
Amounts provided for during year	552	2,642
Cash payments	(2,021)	(2,380)
Reclassification of environmental liability		(92)
Foreign currency translation	(28)	38
Exit activity liability, end of period	232	1,729	1,521
Cost Reduction Initiative | Vehicle Control Segment | Operating Segments
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	400
Cost Reduction Initiative | Temperature Control Segment | Operating Segments
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	100
Cost Reduction Initiative | Engineered Solutions Segment | Operating Segments
Restructuring and integration activities [Roll Forward]
Amounts provided for during year	0
Cost Reduction Initiative | Workforce Reduction
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period	1,729	1,521
Amounts provided for during year	163	1,973
Cash payments	(1,632)	(1,803)
Reclassification of environmental liability		0
Foreign currency translation	(28)	38
Exit activity liability, end of period	232	1,729	1,521
Cost Reduction Initiative | Other Exit Costs
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period	0	0
Amounts provided for during year	389	669
Cash payments	(389)	(577)
Reclassification of environmental liability		(92)
Foreign currency translation	0	0
Exit activity liability, end of period	$ 0	0	$ 0
Particulate Matter Sensor Product Line Relocation Program
Restructuring and integration activities [Roll Forward]
Amounts provided for during year		$ 100

Sale of Receivables (Details)

Sale of Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Sale of receivables to financial institutions	$ 884.7	$ 830.8
Receivables not yet collected	5.8	4.5
Charge related to sale of receivables	$ 48.5	$ 46	$ 32

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Finished goods	$ 394,852	$ 302,557
Work-in-process	22,053	18,503
Raw materials	208,008	186,015
Subtotal	624,913	507,075
Unreturned customer inventories	16,163	18,240
Total inventories	$ 641,076	$ 525,315

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 441,999	$ 381,528
Less accumulated depreciation	273,264	259,656
Total property, plant and equipment, net	168,735	121,872
Depreciation expense	20,600	19,700	$ 19,000
Land, buildings and improvements
Property, plant and equipment [Abstract]
Total property, plant and equipment	68,356	45,710
Machinery and equipment
Property, plant and equipment [Abstract]
Total property, plant and equipment	186,902	177,337
Tools, dies and auxiliary equipment
Property, plant and equipment [Abstract]
Total property, plant and equipment	78,934	73,494
Furniture and fixtures
Property, plant and equipment [Abstract]
Total property, plant and equipment	37,400	33,212
Leasehold improvements
Property, plant and equipment [Abstract]
Total property, plant and equipment	18,991	16,418
Construction-in-progress
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 51,416	$ 35,357

Leases - Narrative (Details)

Leases - Narrative (Details)	Dec. 31, 2024 renewal_option
Leases [Abstract]
Lessee, operating lease, remaining lease term (up to)	10 years
Lessee, operating lease, number of renewal options	1
Lessee, operating lease, renewal term	5 years

Leases - Schedule of Lessee Qua

Leases - Schedule of Lessee Quantitative Disclosures Related To Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Balance Sheet Information
Operating lease right-of-use assets	$ 109,899	$ 100,065
Liabilities
Sundry payables and accrued expenses	$ 19,992	$ 17,139
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Sundry payables and accrued expenses	Sundry payables and accrued expenses
Noncurrent operating lease liabilities	$ 98,214	$ 88,974
Total operating lease liabilities	$ 118,206	$ 106,113
Weighted Average Remaining Lease Term	7 years 8 months 12 days	8 years 3 months 18 days
Weighted Average Discount Rate	5%	4.80%

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 19,993	$ 16,434
Variable and other lease expense	3,907	3,272
Total lease costs	23,900	19,706
Cash paid for the amounts included in the measurement of lease liabilities	18,365	12,099
Right-of-use assets obtained in exchange for new lease obligations	17,873	$ 66,014
Poland
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for new lease obligations	4,700
Mexico
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for new lease obligations	$ 10,800

Leases - Schedule of Lessee, Op

Leases - Schedule of Lessee, Operating Lease, Liability, to be Paid, Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
2025	$ 20,889
2026	19,169
2027	16,906
2028	14,579
2029	13,990
Thereafter	59,220
Total lease payments	144,753
Less: Interest	(26,547)
Total operating lease liabilities	$ 118,206	$ 106,113

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Goodwill impairment charge	$ 0
Amortization expense	10,000	$ 8,500	$ 8,600
Other intangible assets	210,430	76,017
Finite-lived intangibles, accumulated amortization	106,304	95,681
Computer software
Property, Plant and Equipment [Line Items]
Amortization expense	800	800	$ 700
Other intangible assets	21,400	19,100
Finite-lived intangibles, accumulated amortization	$ 18,300	$ 18,000
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	3 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	10 years

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Operating Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill by operating segment [Abstract]
Goodwill, beginning balance	$ 173,217	$ 170,575
Goodwill, accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	134,729	132,087
Goodwill, foreign currency translation	(5,505)	434
Goodwill, ending balance	279,906	173,217
Goodwill, accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	241,418	134,729
Step acquisition of Gwo Yng
Goodwill by operating segment [Abstract]
Goodwill, acquired during period		2,208
Acquisition of Nissens Automotive
Goodwill by operating segment [Abstract]
Goodwill, acquired during period	112,194
Vehicle Control
Goodwill by operating segment [Abstract]
Goodwill, beginning balance	129,294	129,008
Goodwill, accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	90,806	90,520
Goodwill, foreign currency translation	(384)	286
Goodwill, ending balance	128,910	129,294
Goodwill, accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	90,422	90,806
Vehicle Control | Step acquisition of Gwo Yng
Goodwill by operating segment [Abstract]
Goodwill, acquired during period		0
Vehicle Control | Acquisition of Nissens Automotive
Goodwill by operating segment [Abstract]
Goodwill, acquired during period	0
Temperature Control
Goodwill by operating segment [Abstract]
Goodwill, beginning balance	12,730	11,474
Goodwill, accumulated impairment losses, Beginning balance	0	0
Goodwill net, beginning balance	12,730	11,474
Goodwill, foreign currency translation	(62)	42
Goodwill, ending balance	12,668	12,730
Goodwill, accumulated impairment losses, Ending balance	0	0
Goodwill net, ending balance	12,668	12,730
Temperature Control | Step acquisition of Gwo Yng
Goodwill by operating segment [Abstract]
Goodwill, acquired during period		1,214
Temperature Control | Acquisition of Nissens Automotive
Goodwill by operating segment [Abstract]
Goodwill, acquired during period	0
Engineered Solutions
Goodwill by operating segment [Abstract]
Goodwill, beginning balance	31,193	30,093
Goodwill, accumulated impairment losses, Beginning balance	0	0
Goodwill net, beginning balance	31,193	30,093
Goodwill, foreign currency translation	(144)	106
Goodwill, ending balance	31,049	31,193
Goodwill, accumulated impairment losses, Ending balance	0	0
Goodwill net, ending balance	31,049	31,193
Engineered Solutions | Step acquisition of Gwo Yng
Goodwill by operating segment [Abstract]
Goodwill, acquired during period		994
Engineered Solutions | Acquisition of Nissens Automotive
Goodwill by operating segment [Abstract]
Goodwill, acquired during period	0
Nissens Automotive
Goodwill by operating segment [Abstract]
Goodwill, beginning balance	0	0
Goodwill, accumulated impairment losses, Beginning balance	0	0
Goodwill net, beginning balance	0	0
Goodwill, foreign currency translation	(4,915)	0
Goodwill, ending balance	107,279	0
Goodwill, accumulated impairment losses, Ending balance	0	0
Goodwill net, ending balance	107,279	0
Nissens Automotive | Step acquisition of Gwo Yng
Goodwill by operating segment [Abstract]
Goodwill, acquired during period		$ 0
Nissens Automotive | Acquisition of Nissens Automotive
Goodwill by operating segment [Abstract]
Goodwill, acquired during period	$ 112,194

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Schedule of Acquired Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	$ 404,158	$ 186,899
Less accumulated amortization	(106,304)	(95,681)
Net acquired intangible assets	297,854	91,218
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	303,547	159,641
Patents, developed technology and intellectual property
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	14,123	14,123
Trademarks and trade names
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	82,220	8,880
Intangible assets related trademark/trade	74,900
Non-compete agreements
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	3,308	3,295
Supply agreements
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	800	800
Leaseholds
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets	$ 160	$ 160

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expenses in Future Period Based on the Current Estimated Useful Lives (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2025	$ 17,500
2026	17,500
2027	17,500
2028	17,500
2029-2041	$ 153,000

Investments in Unconsolidated_3

Investments in Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates (Details) $ in Thousands, ¥ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2022 CNY (¥)	Aug. 31, 2019 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2013 USD ($)
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	$ 24,842	$ 24,050	$ 41,745
Foshan FGD SMP Automotive Compressor Co. Ltd.
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	19,994	18,426					$ 12,500
Foshan Che Yijia New Energy Technology Co., Ltd.
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	2,401	3,128		$ 242	¥ 1.7	$ 5,100
Orange Electronic Co. Ltd
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	$ 2,447	$ 2,496						$ 6,300

Investments in Unconsolidated_4

Investments in Unconsolidated Affiliates - Narrative (Details) $ in Thousands, ¥ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 31, 2022 CNY (¥)	Dec. 31, 2021 USD ($)	Aug. 31, 2019 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2013 USD ($)
Investments in and Advances to Affiliates [Line Items]
Investments in unconsolidated affiliates		$ 24,842	$ 24,050	$ 41,745
Outstanding borrowings		562,314	156,211
Foshan FGD SMP Automotive Compressor Co. Ltd.
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage								50%
Investments in unconsolidated affiliates		19,994	18,426					$ 12,500
Purchases from the joint venture		60,000	44,100
Foshan FGD SMP Automotive Compressor Co. Ltd. | Gwo Yng Enterprise Co., Ltd.
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage								50%
Foshan Che Yijia New Energy Technology Co., Ltd.
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	33%				33%		29%
Investments in unconsolidated affiliates	$ 242	2,401	3,128		¥ 1.7		$ 5,100
Additional ownership acquired	3.55%
Maximum borrowing capacity						$ 4,000
Debt instrument stated percentage						5%
Outstanding borrowings		4,000
Orange Electronic Co. Ltd
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage									19.40%
Investments in unconsolidated affiliates		2,447	2,496						$ 6,300
Purchases from the joint venture		$ 1,400	$ 3,200

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Other Assets [Abstract]
Deferred compensation	$ 26,333	$ 23,893
Long-term investments	92	7,468
Noncurrent portion of interest rate swap fair value	3,991	1,944
Deferred financing costs, net	1,702	1,125
Other	1,021	837
Total other assets, net	$ 33,139	$ 35,267

Credit Facilities and Long-Te_3

Credit Facilities and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total debt	$ 562,314	$ 156,211
Current maturities of debt	27,117	5,029
Long-term debt	535,197	151,182
Revolver | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	0	63,500
Term loan | Line of Credit | Secured Debt
Debt Instrument [Line Items]
Total debt	0	92,500
Multi-currency revolver | Line of Credit | Secured Debt
Debt Instrument [Line Items]
Total debt	244,171	0
U.S. dollar term loan | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	198,287	0
Euro term loan | Line of Credit
Debt Instrument [Line Items]
Unamortized deferred financing costs	2,700
Euro term loan | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	102,908	0
Current maturities of debt	4,923
Long-term debt	97,985
Other
Debt Instrument [Line Items]
Total debt	16,948	$ 211
Other | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	16,948
Current maturities of debt	1,878
Long-term debt	$ 15,070

Credit Facilities and Long-Te_4

Credit Facilities and Long-Term Debt - Narrative (Details) € in Millions, zł in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Nov. 30, 2023 USD ($)	Dec. 31, 2024 USD ($) extension	Dec. 31, 2023 USD ($)	Oct. 31, 2024 EUR (€)	Sep. 30, 2024 EUR (€)	Jul. 31, 2024 USD ($)	Nov. 30, 2023 PLN (zł)	Jun. 30, 2022 USD ($)
Line of Credit Facility [Line Items]
Current portion of revolving credit facility			$ 10,800,000	$ 0
Deferred financing costs			4,800,000	1,600,000
Interest expense			1,400,000
2025			1,200,000
2026			1,100,000
2027			1,000,000
2028			900,000
2029			600,000
Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, notional amount					€ 100				$ 100,000,000
Term Loan and Revolving Credit Facilities
Line of Credit Facility [Line Items]
Borrowings under credit agreement			545,400,000	156,000,000
Current portion of revolving credit facility			25,200,000	5,000,000
Long-term debt			520,100,000	151,000,000
Outstanding letters of credit with certain vendors			$ 2,500,000	$ 2,300,000
Weighted average interest rate			5.60%	5%
2022 Credit Agreement | Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, notional amount				$ 100,000,000
2022 And 2024 Credit Agreement
Line of Credit Facility [Line Items]
Deferred financing costs							$ 5,100,000
Line of Credit | 2024 Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument term	5 years
Leverage ratio			2.75
Line of Credit | 2024 Credit Agreement | Minimum | Base Rate
Line of Credit Facility [Line Items]
Margin on variable rate			1.25%
Line of Credit | 2024 Credit Agreement | Maximum | Base Rate
Line of Credit Facility [Line Items]
Margin on variable rate			2.25%
Line of Credit | 2024 Credit Agreement | Secured Debt
Line of Credit Facility [Line Items]
Accordion feature, increase limit			$ 168,000,000
Maximum consolidated EBITDA			1
Line of Credit | 2024 Credit Agreement | Secured Debt | Debt Instrument, Redemption, Period One
Line of Credit Facility [Line Items]
Periodic payment amortization percentage			1.25%
Line of Credit | 2024 Credit Agreement | Secured Debt | Debt Instrument, Redemption, Period Two
Line of Credit Facility [Line Items]
Periodic payment amortization percentage			1.875%
Line of Credit | 2024 Credit Agreement | Secured Debt | Debt Instrument, Redemption, Period Three
Line of Credit Facility [Line Items]
Periodic payment amortization percentage			2.50%
Line of Credit | 2024 Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 750,000,000
Line of Credit | 2024 Credit Agreement | Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	25,000,000
Line of Credit | 2024 Credit Agreement | Bridge Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	30,000,000
Line of Credit | 2024 Credit Agreement, Global Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	430,000,000
Line of Credit | 2024 Credit Agreement, Danish Tranche | Secured Debt
Line of Credit Facility [Line Items]
Accordion feature, increase limit			$ 5,000,000
Line of Credit | 2024 Credit Agreement, Danish Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	10,000,000
Line of Credit | 2024 Credit Agreement, Delayed Draw Term Loan Facility, U.S. Dollars | Secured Debt
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 200,000,000
Line of Credit | 2024 Credit Agreement, Delayed Draw Term Loan Facility, Euro | Secured Debt
Line of Credit Facility [Line Items]
Maximum borrowing capacity | €						€ 100
Line of Credit | Credit Facility - Term Loan Due 2027 | Maximum
Line of Credit Facility [Line Items]
Number of extensions of maturity date | extension			2
Line of Credit | Term Loan and Revolving Credit Facilities
Line of Credit Facility [Line Items]
Debt instrument, extension period			1 year
Average daily loan balance outstanding			$ 700,000	100,000
Line of Credit | 2022 Credit Agreement | Secured Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount							$ 125,000,000
Line of Credit | Polish Overdraft Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 7,300,000						zł 30
Threshold percentage of borrowing capacity		85%						85%
Threshold borrowing capacity limit			6,200,000
Overdraft facility renewal period		3 months
Overdraft facility cancellation period		30 days
Bank overdrafts			$ 0	$ 0
Line of Credit | Polish Overdraft Facility | Warsaw Interbank Offered Rate
Line of Credit Facility [Line Items]
Margin on variable rate		1%
Line of Credit | Polish Overdraft Facility | Euro Interbank Offered Rate
Line of Credit Facility [Line Items]
Margin on variable rate		1%
Line of Credit | Polish Overdraft Facility | Mid-Point Fed Target Range Rate
Line of Credit Facility [Line Items]
Margin on variable rate		1.25%

Credit Facilities and Long-Te_5

Credit Facilities and Long-Term Debt - Schedule of Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Maturities of Debt [Abstract]
2025	$ 27,117
2026	15,725
2027	23,491
2028	31,101
2029	454,585
Thereafter	10,295
Total debt	562,314	$ 156,211
Less: current maturities	(27,117)	(5,029)
Long-term debt	535,197	151,182
Multi-Currency Revolver | Revolving Credit Facility | Line of Credit
Maturities of Debt [Abstract]
2025	10,800
2026	0
2027	0
2028	0
2029	233,371
Thereafter	0
Total debt	244,171
Less: current maturities	(10,800)
Long-term debt	233,371
U.S. Dollar Term Loan | Revolving Credit Facility | Line of Credit
Maturities of Debt [Abstract]
2025	9,516
2026	9,606
2027	14,655
2028	19,703
2029	144,807
Thereafter	0
Total debt	198,287
Less: current maturities	(9,516)
Long-term debt	188,771
Euro Term Loan | Revolving Credit Facility | Line of Credit
Maturities of Debt [Abstract]
2025	4,923
2026	4,973
2027	7,598
2028	10,221
2029	75,193
Thereafter	0
Total debt	102,908	0
Less: current maturities	(4,923)
Long-term debt	97,985
Other Debt
Maturities of Debt [Abstract]
Total debt	16,948	$ 211
Other Debt | Revolving Credit Facility | Line of Credit
Maturities of Debt [Abstract]
2025	1,878
2026	1,146
2027	1,238
2028	1,177
2029	1,214
Thereafter	10,295
Total debt	16,948
Less: current maturities	(1,878)
Long-term debt	$ 15,070

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income Attributable to SMP - Schedule of Accumulated Other Comprehensive by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 650,873	$ 621,038
Balance at end of period	630,082	650,873
Unrealized gain (loss)	1,400	(1,200)
Unrealized gain (loss) on cash flow hedge, net of tax	1,000	(900)
Cash settlement receipts (payments), pretax	2,500	2,400
Cash settlement receipts (payments), net of tax	1,900	1,700
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(5,974)	(12,470)
Other comprehensive income before reclassifications	(20,492)	8,264
Amounts reclassified from accumulated other comprehensive income	(2,542)	(2,394)
Net other comprehensive income (loss)	(23,034)	5,870
Tax amounts	3,176	626
Balance at end of period	(25,832)	(5,974)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(8,897)	(16,330)
Other comprehensive income before reclassifications	(23,385)	7,433
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income (loss)	(23,385)	7,433
Tax amounts	2,513	0
Balance at end of period	(29,769)	(8,897)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	2,899	3,823
Other comprehensive income before reclassifications	2,893	831
Amounts reclassified from accumulated other comprehensive income	(2,524)	(2,372)
Net other comprehensive income (loss)	369	(1,541)
Tax amounts	656	617
Balance at end of period	3,924	2,899
Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	24	37
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	(18)	(22)
Net other comprehensive income (loss)	(18)	(22)
Tax amounts	7	9
Balance at end of period	$ 13	$ 24

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Stock repurchased during period		$ 10,428		$ 29,656
Stock Repurchase Program July 2022
Class of Stock [Line Items]
Share repurchase program, authorized, amount	$ 30,000
Stock repurchased during period (in shares)	321,229		0
Stock Repurchase Program October 2021
Class of Stock [Line Items]
Stock repurchased during period	$ 10,400

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans - Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) Type $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of types of restricted stock | Type	2
Compensation expense, gross | $	$ 6,127	$ 6,598	$ 8,178
Restricted Shares | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	3 years
Restricted Shares | Executives
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, estimated forfeitures, percentage	0%
Restricted Shares | Employees
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, estimated forfeitures, percentage	5%
Restricted Shares | Directors
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, estimated forfeitures, percentage	0%
Restricted Shares | Share-Based Payment Arrangement, Tranche One | Executives
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	25%
Vesting period, initial age limit	2 months
Restricted Shares | Share-Based Payment Arrangement, Tranche Two | Executives
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	100%
Vesting period, fully vested age limit	2 months
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Measuring period for performance-based shares	3 years
Performance Shares | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	3 years
Restricted and Performance-Based Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)	277,742	230,875
Compensation expense, gross | $	$ 5,800	$ 6,200	7,600
Compensation expense, net of tax | $	4,300	4,800	5,700
Unamortized compensation expense | $	13,500	13,300	14,900
Weighted-average grant date fair value | $	$ 25,500	$ 26,000	$ 28,000
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 26.82	$ 29.48	$ 31.79
Restricted and Performance-Based Shares | Executives and Directors | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, holding period	1 year
Post vesting holding period for restricted and performance shares issued	1 year
Restricted and Performance-Based Shares | Executives and Directors | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, holding period	2 years
Post vesting holding period for restricted and performance shares issued	2 years
2016 Omnibus Incentive Plan | Restricted Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)	199,510
2016 Omnibus Incentive Plan | Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)	78,232
2016 Omnibus Incentive Plan | Restricted and Performance-Based Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Issuance of restricted and performance-based stock (in shares)	1,863,027
Common stock available for future grants (in shares)	186,973
Granted (in shares)	277,742
2016 Omnibus Incentive Plan | Share-Based Payment Arrangement, Employee
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)	2,050,000
2016 Omnibus Incentive Plan | Share-Based Payment Arrangement, Nonemployee
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)	350,000

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans - Schedule of Stock-Based Compensation Expenses (Details) - Restricted and Performance-Based Shares - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unamortized compensation expense	$ 13.5	$ 13.3	$ 14.9
Employees
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected period	3 years 8 months 12 days	4 years 1 month 6 days	4 years 3 months 18 days
Directors
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected period	3 months 18 days	3 months 18 days	3 months 18 days

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans - Schedule of Share-Based Payment Arrangement, Restricted Stock and Performance-Based Share Activity (Details) - Restricted and Performance-Based Shares - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Shares
Beginning of period (in shares)	880,976	880,829
Granted (in shares)	277,742	230,875
Vested (in shares)	(181,430)	(248,065)
Performance Shares Target Adjustment (in shares)	(14,247)	29,137
Forfeited (in shares)	(34,017)	(11,800)
End of period (in shares)	929,024	880,976
Weighted Average Grant Date Fair Value per Share
Beginning of period (in dollars per share)	$ 29.48	$ 31.79
Granted (in dollars per share)	24.25	27
Vested (in dollars per share)	34.46	36.30
Performance Shares Target Adjustment (in dollars per share)	39.28	36.30
Forfeited (in dollars per share)	29.83	35.36
End of period (in dollars per share)	$ 26.82	$ 29.48

Employee Benefits - Schedule of

Employee Benefits - Schedule of Defined Contribution Plan Matching Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
U.S. Defined Contribution	$ 10,314	$ 10,510	$ 10,180

Employee Benefits - Narrative (

Employee Benefits - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Provision for expense in connection with ESOP			$ 2.8	$ 3	$ 2.3
Employee Stock Ownership Plan and Trust (ESOP)
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Additional shares contributed to ESOP (in shares)			68,700
Shares released from trust (in shares)			68,700
Total remaining balance of shares in the ESOP (in shares)			200
Supplemental Executive Retirement Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employer discretionary contribution amount	$ 0.6	$ 0.8	$ 0.4

Other Non-Operating Income, N_3

Other Non-Operating Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Non-Operating Income (Expense), Net [Abstract]
Interest and dividend income	$ 871	$ 517	$ 209
Equity income from joint ventures	4,274	2,070	3,464
Gain (loss) on foreign exchange	1,228	(776)	334
Other non-operating income, net	504	515	807
Total other non-operating income, net	$ 6,877	$ 2,326	$ 4,814

Derivative Financial Instrume_2

Derivative Financial Instruments (Details) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Oct. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)
Notional Disclosures [Abstract]
Fixed interest rate	2.11%	2.11%
Derivative asset fair value	$ 3,991			$ 1,944
Cash Flow Hedging
Notional Disclosures [Abstract]
Accumulated other comprehensive income	$ 1,300
Interest Rate Swap Agreement
Notional Disclosures [Abstract]
Borrowings under credit agreement					$ 100,000
Fixed interest rate	2.683%	2.683%
Interest Rate Swap
Notional Disclosures [Abstract]
Derivative, notional amount			€ 100		$ 100,000
Interest Rate Swap | Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative asset fair value	$ 5,409			3,900
Derivative liability fair value	100
Foreign Exchange Contract | Designated as Hedging Instrument | Net Investment Hedging
Notional Disclosures [Abstract]
Realized gain on currency translation adjustment	9,700
Derivative realized losses	0
Foreign Exchange Contract | Not Designated as Hedging Instrument
Notional Disclosures [Abstract]
Derivative, notional amount	0			$ 0
Derivative realized losses	2,500
Foreign Exchange Contract | Nissens Automotive | Designated as Hedging Instrument | Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, notional amount	103,900	€ 100
Foreign Exchange Contract | Nissens Automotive | Designated as Hedging Instrument | Net Investment Hedging
Notional Disclosures [Abstract]
Derivative, notional amount	$ 202,500	€ 195

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Inputs, Level 1
Fair Value, Net Asset (Liability) [Abstract]
Cash		$ 29,500
Fair Value, Inputs, Level 2
Fair Value, Net Asset (Liability) [Abstract]
Cash equivalents		3,000
Fair Value | Fair Value Inputs, Level 1 and Level 2
Fair Value, Net Asset (Liability) [Abstract]
Cash and cash equivalents	$ 44,426	32,526
Fair Value | Fair Value, Inputs, Level 1
Fair Value, Net Asset (Liability) [Abstract]
Deferred compensation	26,333	23,893
Short term borrowings	27,117	5,029
Long-term debt	535,197	151,182
Fair Value | Fair Value, Inputs, Level 2
Fair Value, Net Asset (Liability) [Abstract]
Short-term investments	6,956	0
Long-term investments	93	7,468
Cash flow hedge interest rate swaps	5,409	3,939
Carrying Amount | Fair Value Inputs, Level 1 and Level 2
Fair Value, Net Asset (Liability) [Abstract]
Cash and cash equivalents	44,426	32,526
Carrying Amount | Fair Value, Inputs, Level 1
Fair Value, Net Asset (Liability) [Abstract]
Deferred compensation	26,333	23,893
Short term borrowings	27,117	5,029
Long-term debt	535,197	151,182
Carrying Amount | Fair Value, Inputs, Level 2
Fair Value, Net Asset (Liability) [Abstract]
Short-term investments	6,956	0
Long-term investments	$ 93	7,468
Cash flow hedge interest rate swaps		$ 3,939

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Domestic	$ 19,761	$ 15,422	$ 16,182
Foreign	11,254	9,224	8,669
Total current	31,015	24,646	24,851
Deferred:
Domestic	(9,536)	(5,769)	1,102
Foreign	(2,094)	(509)	(747)
Total deferred	(11,630)	(6,278)	355
Total income tax provision	$ 19,385	$ 18,368	$ 25,206

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S. Federal income tax rate of 21%	$ 15,538	$ 17,160	$ 20,650
Increase (decrease) in tax rate resulting from:
State and local income taxes, net of federal income tax benefit	1,922	2,086	3,118
Change in valuation allowance	770	674	1,068
Income tax (benefit) attributable to foreign income	4,370	377	(53)
Other non-deductible items, net	(3,215)	(1,929)	423
Total income tax provision	$ 19,385	$ 18,368	$ 25,206
Income tax rate	21%	21%	21%

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Inventories
Inventories	$ 9,087	$ 10,493
Allowance for customer returns	17,854	13,083
Accrued asbestos liabilities	24,032	20,758
Accrued salaries and benefits	13,564	11,816
Tax credit and net operating loss carryforwards	5,690	5,968
Allowance for expected credit losses	3,586	3,567
Other	10	17
Deferred tax assets, gross	73,823	65,702
Valuation allowance	(4,849)	(3,830)
Total deferred tax assets	68,974	61,872
Deferred tax liabilities:
Intangible assets acquired, net of amortization	43,755	12,668
Depreciation	6,669	7,597
Interest rate swap agreement	1,345	990
Other	4,006	84
Total deferred tax liabilities	55,775	21,339
Net deferred tax assets	$ 13,199	$ 40,533

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards [Abstract]
Valuation allowance	$ 4,849	$ 3,830
Net deferred tax asset	13,199	40,533
Uncertain tax positions	0	$ 0	$ 0
Foreign Tax Jurisdiction
Operating Loss Carryforwards [Abstract]
Tax credit carryforward	4,600
Operating loss carryforwards	$ 200
Foreign Tax Jurisdiction | Minimum
Operating Loss Carryforwards [Abstract]
Period for statutes of limitations	2 years
Foreign Tax Jurisdiction | Maximum
Operating Loss Carryforwards [Abstract]
Period for statutes of limitations	6 years

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Net Earnings Attributable to SMP and the Shares Used in Calculating Basic and Dilutive Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net earnings (loss) attributable to SMP
Continuing operations		$ 53,628	$ 63,144	$ 73,042
Discontinued operations		(26,128)	(28,996)	(17,691)
Net earnings attributable to SMP	[1]	$ 27,500	$ 34,148	$ 55,351
Basic net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		$ 2.46	$ 2.91	$ 3.37
Discontinued operations (in dollars per share)		(1.20)	(1.34)	(0.82)
Diluted net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		2.41	2.85	3.30
Discontinued operations (in dollars per share)		$ (1.17)	$ (1.31)	$ (0.80)
Weighted average number of common shares, basic (in shares)		21,801,141	21,716,177	21,683,719
Dilutive effect of restricted stock and performance-based stock (in shares)		435,919	445,164	456,262
Weighted average common shares outstanding - Diluted (in shares)		22,237,060	22,161,341	22,139,981
[1] Throughout this Form 10-K, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Earnings Per Share - Schedule_2

Earnings Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restricted and performance shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	285	280	292

Industry Segment and Geograph_3

Industry Segment and Geographic Data - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 segment
Segment Reporting Information [Line Items]
Number of operating segments	4
Customer Concentration Risk | Three Largest Individual Customers | Net Sales
Segment Reporting Information [Line Items]
Concentration risk, percentage	60.70%
Customer Concentration Risk | O’Reilly Auto Parts | Net Sales
Segment Reporting Information [Line Items]
Concentration risk, percentage	28.40%
Customer Concentration Risk | AutoZone | Net Sales
Segment Reporting Information [Line Items]
Concentration risk, percentage	18.80%
Customer Concentration Risk | NAPA | Net Sales
Segment Reporting Information [Line Items]
Concentration risk, percentage	13.50%

Industry Segment and Geograph_4

Industry Segment and Geographic Data - Schedule of Sales and Operating Income by Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 1,463,849	$ 1,358,272	$ 1,371,815
Cost of sales	1,040,528	969,446	989,276
Gross profit	423,321	388,826	382,539
Selling and marketing expenses	71,412	71,402	74,150
Distribution expenses	107,451	89,857	88,326
General and administration expenses	97,216	86,217	82,000
Supply chain financing expenses	48,539	46,031	32,037
Restructuring and integration expenses	7,668	2,642	1,891
Other expenses	10,411	0	0
Total operating expenses	342,697	296,149	278,404
Operating income	80,624	92,677	104,135
Other non-operating income, net	6,877	2,326	4,814
Interest expense	13,512	13,287	10,617
Earnings from continuing operations before income taxes	73,989	81,716	98,332
Other
Segment Reporting Information [Line Items]
Net sales	0	0	0
Cost of sales	0	0	0
Gross profit	0	0	0
Selling and marketing expenses	0	0	0
Distribution expenses	4,579	0	0
General and administration expenses	17,052	15,937	15,190
Supply chain financing expenses	0	0	0
Restructuring and integration expenses	1,729	0	0
Other expenses	10,311	0	0
Total operating expenses	33,671	15,937	15,190
Operating income	(33,671)	(15,937)	(15,190)
Vehicle Control | Operating Segments
Segment Reporting Information [Line Items]
Net sales	762,560	737,932	750,571
Cost of sales	518,475	499,717	518,304
Gross profit	244,085	238,215	232,267
Selling and marketing expenses	45,878	46,223	49,245
Distribution expenses	57,627	54,401	54,081
General and administration expenses	36,935	34,430	31,812
Supply chain financing expenses	32,090	30,558	21,480
Restructuring and integration expenses	4,249	1,276	1,496
Other expenses	0	0	0
Total operating expenses	176,779	166,888	158,114
Operating income	67,306	71,327	74,153
Temperature Control | Operating Segments
Segment Reporting Information [Line Items]
Net sales	380,088	337,754	351,237
Cost of sales	262,296	241,927	252,323
Gross profit	117,792	95,827	98,914
Selling and marketing expenses	15,938	16,772	17,666
Distribution expenses	32,858	30,467	29,868
General and administration expenses	16,763	14,664	13,969
Supply chain financing expenses	16,449	15,473	10,557
Restructuring and integration expenses	847	1,108	395
Other expenses	0	0	0
Total operating expenses	82,855	78,484	72,455
Operating income	34,937	17,343	26,459
Engineered Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	285,456	282,586	270,007
Cost of sales	235,537	227,802	218,649
Gross profit	49,919	54,784	51,358
Selling and marketing expenses	8,060	8,407	7,239
Distribution expenses	5,290	4,989	4,377
General and administration expenses	20,906	21,186	21,029
Supply chain financing expenses	0	0	0
Restructuring and integration expenses	843	258	0
Other expenses	0	0	0
Total operating expenses	35,099	34,840	32,645
Operating income	14,820	19,944	18,713
Nissens Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net sales	35,745	0	0
Cost of sales	24,220	0	0
Gross profit	11,525	0	0
Selling and marketing expenses	1,536	0	0
Distribution expenses	7,097	0	0
General and administration expenses	5,560	0	0
Supply chain financing expenses	0	0	0
Restructuring and integration expenses	0	0	0
Other expenses	100	0	0
Total operating expenses	14,293	0	0
Operating income	$ (2,768)	$ 0	$ 0

Industry Segment and Geograph_5

Industry Segment and Geographic Data - Schedule of Reconciliation of Segment Operating Income to Net Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information, Profit (Loss) [Abstract]
Depreciation and amortization	$ 31,413	$ 29,022	$ 28,298
Investments in unconsolidated affiliates	24,842	24,050	41,745
Capital expenditures	44,018	28,633	25,956
Assets	1,814,126	1,293,047	1,254,929
Other
Segment Reporting Information, Profit (Loss) [Abstract]
Depreciation and amortization	1,714	1,755	1,693
Investments in unconsolidated affiliates	0	0	0
Capital expenditures	1,860	684	2,116
Assets	109,664	105,741	92,485
Vehicle Control | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Depreciation and amortization	14,841	13,877	14,075
Investments in unconsolidated affiliates	2,447	2,496	2,490
Capital expenditures	29,603	13,955	13,378
Assets	659,607	620,569	618,789
Temperature Control | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Depreciation and amortization	3,307	3,424	2,973
Investments in unconsolidated affiliates	20,396	19,711	27,557
Capital expenditures	2,621	1,899	3,973
Assets	276,216	274,657	254,137
Engineered Solutions | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Depreciation and amortization	9,608	9,966	9,557
Investments in unconsolidated affiliates	1,999	1,843	11,698
Capital expenditures	9,721	12,095	6,489
Assets	285,866	292,080	289,518
Nissens Automotive | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Depreciation and amortization	1,943	0	0
Investments in unconsolidated affiliates	0	0
Capital expenditures	213	0	0
Assets	$ 482,773	$ 0	$ 0

Industry Segment and Geograph_6

Industry Segment and Geographic Data - Schedule of Long-lived Assets by Geographical Areas (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 879,003	$ 508,291	$ 458,832
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	378,557	368,792	326,199
Denmark
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	347,629	0	0
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	67,406	75,869	76,766
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	59,909	44,517	38,351
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	21,173	13,262	10,355
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 4,329	$ 5,851	$ 7,161

Net Sales - Major Product Group

Net Sales - Major Product Group (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 1,463,849	$ 1,358,272	$ 1,371,815
Other
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Vehicle Control | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	762,560	737,932	750,571
Vehicle Control | Operating Segments | Engine Management (Ignition, Emissions and Fuel Delivery)
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	467,460	450,180	454,571
Vehicle Control | Operating Segments | Electrical and Safety
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	229,361	221,782	230,487
Vehicle Control | Operating Segments | Wire Sets and Other
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	65,739	65,970	65,513
Temperature Control | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	380,088	337,754	351,237
Temperature Control | Operating Segments | AC System Components
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	274,926	237,756	245,484
Temperature Control | Operating Segments | Other Thermal Components
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	105,162	99,998	105,753
Engineered Solutions | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	285,456	282,586	270,007
Engineered Solutions | Operating Segments | Commercial Vehicle
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	89,171	79,376	80,275
Engineered Solutions | Operating Segments | Construction/Agriculture
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	35,832	41,665	42,385
Engineered Solutions | Operating Segments | Light Vehicle
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	91,548	92,701	91,533
Engineered Solutions | Operating Segments | All Other
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	68,905	68,844	55,814
Nissens Automotive | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	35,745	0	0
Nissens Automotive | Operating Segments | Engine Cooling
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	19,287	0	0
Nissens Automotive | Operating Segments | Air Conditioning
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	9,214	0	0
Nissens Automotive | Operating Segments | Engine Efficiency
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 7,244	$ 0	$ 0

Net Sales - Geographic Area (De

Net Sales - Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 1,463,849	$ 1,358,272	$ 1,371,815
United States
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,195,810	1,148,352	1,209,104
Europe
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	86,733	60,190	38,520
Canada
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	85,499	78,858	66,591
Mexico
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	49,878	43,057	31,317
Asia
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	36,677	20,399	19,186
Other foreign
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	9,252	7,416	7,097
Other
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other | United States
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other | Europe
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other | Canada
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other | Mexico
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other | Asia
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other | Other foreign
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Vehicle Control | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	762,560	737,932	750,571
Vehicle Control | Operating Segments | United States
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	677,779	659,570	682,145
Vehicle Control | Operating Segments | Europe
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,118	916	661
Vehicle Control | Operating Segments | Canada
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	37,683	36,088	35,233
Vehicle Control | Operating Segments | Mexico
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	40,555	36,350	26,019
Vehicle Control | Operating Segments | Asia
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	330	351	2,408
Vehicle Control | Operating Segments | Other foreign
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	5,095	4,657	4,105
Temperature Control | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	380,088	337,754	351,237
Temperature Control | Operating Segments | United States
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	360,858	319,904	335,281
Temperature Control | Operating Segments | Europe
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	176	8	75
Temperature Control | Operating Segments | Canada
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	16,707	17,081	14,596
Temperature Control | Operating Segments | Mexico
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	171	49	401
Temperature Control | Operating Segments | Asia
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,741	526	63
Temperature Control | Operating Segments | Other foreign
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	435	186	821
Engineered Solutions | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	285,456	282,586	270,007
Engineered Solutions | Operating Segments | United States
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	154,960	168,878	191,678
Engineered Solutions | Operating Segments | Europe
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	53,682	59,266	37,784
Engineered Solutions | Operating Segments | Canada
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	31,027	25,689	16,762
Engineered Solutions | Operating Segments | Mexico
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	9,138	6,658	4,897
Engineered Solutions | Operating Segments | Asia
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	33,508	19,522	16,715
Engineered Solutions | Operating Segments | Other foreign
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	3,141	2,573	2,171
Nissens Automotive | Operating Segments
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	35,745	0	0
Nissens Automotive | Operating Segments | United States
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	2,213	0	0
Nissens Automotive | Operating Segments | Europe
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	31,757	0	0
Nissens Automotive | Operating Segments | Canada
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	82	0	0
Nissens Automotive | Operating Segments | Mexico
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	14	0	0
Nissens Automotive | Operating Segments | Asia
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,098	0	0
Nissens Automotive | Operating Segments | Other foreign
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 581	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Changes in Product Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Product Warranties
Balance, beginning of period	$ 21,134	$ 19,667
Liabilities accrued for current year sales	134,831	120,027
Settlements of warranty claims	(131,249)	(118,560)
Balance, end of period	$ 24,715	$ 21,134

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) $ in Millions		1 Months Ended		12 Months Ended			280 Months Ended
	Aug. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Aug. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) officer claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($) claim	Aug. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Number of key officers | officer				1
Litigation settlement, amount awarded to other party			$ 10.5
Discontinued operation, provision for loss (gain) on disposal, before income tax					$ 10.5
Financial Standby Letter of Credit
Loss Contingencies [Line Items]
Outstanding letters of credit with certain vendors				$ 2.5	2.3		$ 2.5
Asbestos-Related Damages and Legal Costs | Discontinued Operations
Loss Contingencies [Line Items]
Loss contingency payments				$ 15.3	$ 11	$ 12
Asbestos-Related Damages
Loss Contingencies [Line Items]
Pending claims, approximate number | claim				1,287			1,287
Payments for legal settlements							$ 91.4
Loss contingency accrual		$ 99.6
Asbestos-Related Damages | Discontinued Operations
Loss Contingencies [Line Items]
Incremental pre-tax provision		$ 29.3
Asbestos-Related Damages | Minimum
Loss Contingencies [Line Items]
Estimate of possible loss								$ 99.6
Increase in range of possible loss from lower range	$ 15.6
Asbestos-Related Damages | Maximum
Loss Contingencies [Line Items]
Estimate of possible loss								210.8
Increase in range of possible loss from lower range	$ 75.5
Asbestos-Related Legal Costs | Minimum
Loss Contingencies [Line Items]
Estimate of possible loss								49.8
Asbestos-Related Legal Costs | Maximum
Loss Contingencies [Line Items]
Estimate of possible loss								$ 115.9

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2023 USD ($) claim	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 5,375	$ 8,045	$ 5,375	$ 6,170
Charged to costs and expenses		14,223	15,389	19,698
Other		0	0	0
Deductions		16,796	12,719	20,493
Balance at end of year		5,472	8,045	5,375
Bankruptcy Claims [Abstract]
Customer bankruptcy charge		0	0	7,002
Number of customers who filed a petition | claim	1
Allowance for expected credit losses
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 4,129	6,884	4,129	4,815
Charged to costs and expenses		736	2,940	6,242
Other		0	0	0
Deductions		3,417	185	6,928
Balance at end of year		4,203	6,884	4,129
Allowance for discounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1,246	1,161	1,246	1,355
Charged to costs and expenses		13,487	12,449	13,456
Other		0	0	0
Deductions		13,379	12,534	13,565
Balance at end of year		1,269	1,161	1,246
Allowance for sales returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 37,169	38,238	37,169	42,412
Charged to costs and expenses		184,895	162,525	152,985
Other		3,360	0	0
Deductions		180,022	161,456	158,228
Balance at end of year		$ 46,471	$ 38,238	$ 37,169