Standard Motor Products (SMP) 10-K 22 Feb 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 20, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity File Number	001-04743
Entity Registrant Name	Standard Motor Products, Inc.
Entity Central Index Key	0000093389
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-1362020
Entity Address, Address Line One	37-18 Northern Blvd.
Entity Address, City or Town	Long Island City
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11101
City Area Code	718
Local Phone Number	392-0200
Title of 12(b) Security	Common Stock, par value $2.00 per share
Trading Symbol	SMP
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 737,570,524
Entity Common Stock, Shares Outstanding		21,918,729
Auditor Name	KPMG LLP
Auditor Location	New York, New York
Auditor Firm ID	185

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	[1]	$ 1,358,272		$ 1,371,815		$ 1,298,816
Cost of sales		969,446		989,276		921,885
Gross profit		388,826		382,539		376,931
Selling, general and administrative expenses		293,583		276,626		247,547
Restructuring and integration expenses		2,642	[2],[3]	1,891	[2]	392
Other income, net		76		113		7
Operating income		92,677		104,135		128,999
Other non-operating income, net		2,326		4,814		3,494
Interest expense		13,287		10,617		2,028
Earnings from continuing operations before taxes		81,716		98,332		130,465
Provision for income taxes		18,368		25,206		31,044
Earnings from continuing operations		63,348		73,126		99,421
Loss from discontinued operations, net of income tax benefit of $10,188, $6,216 and $2,975		(28,996)		(17,691)		(8,467)
Net earnings		34,352		55,435		90,954
Net earnings attributable to noncontrolling interest		204		84		68
Net earnings attributable to SMP	[4]	34,148		55,351		90,886
Net earnings attributable to SMP
Earnings from continuing operations		63,144		73,042		99,353
Discontinued operations		(28,996)		(17,691)		(8,467)
Net earnings attributable to SMP	[4]	$ 34,148		$ 55,351		$ 90,886
Net earnings per common share - Basic:
Earnings from continuing operations (in dollars per share)		$ 2.91		$ 3.37		$ 4.49
Discontinued operations (in dollars per share)		(1.34)		(0.82)		(0.39)
Net earnings per common share - Basic (in dollars per share)		1.57		2.55		4.1
Net earnings per common share - Diluted:
Earnings from continuing operations (in dollars per share)		2.85		3.3		4.39
Discontinued operations (in dollars per share)		(1.31)		(0.8)		(0.37)
Net earnings per common share - Diluted (in dollars per share)		1.54		2.5		4.02
Dividend declared per share (in dollars per share)		$ 1.16		$ 1.08		$ 1
Average number of common shares (in shares)		21,716,177		21,683,719		22,147,479
Average number of common shares and dilutive common shares (in shares)		22,161,341		22,139,981		22,616,456
[1]There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.[2]Included in restructuring and integration costs in 2023 and 2022 is a $0.1 million and $0.2 million increase, respectively, in environmental cleanup costs related to ongoing monitoring and remediation in connection with the prior closure of our manufacturing operations at our Long Island City, New York location.  The environmental liability has been reclassed to accrued liabilities as of December 31, 2023 and 2022, respectively.[3]Restructuring and integration expenses incurred during the year ended December 31, 2023 consist of $1.3 million in our Vehicle Control segment, $1.1 million in our Temperature Control segment and $0.2 million in our Engineered Solutions segment.[4]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, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
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, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$ 34,352	$ 55,435	$ 90,954
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	7,447	(8,222)	(2,462)
Derivative instruments	(924)	3,823	0
Pension and postretirement plans	(13)	(15)	(16)
Total other comprehensive income (loss), net of tax	6,510	(4,414)	(2,478)
Total comprehensive income	40,862	51,021	88,476
Comprehensive income (loss) attributable to noncontrolling interest, net of tax:
Net earnings	204	84	68
Foreign currency translation adjustments	14	(113)	15
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	218	(29)	83
Comprehensive income attributable to SMP	$ 40,644	$ 51,050	$ 88,393

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 32,526	$ 21,150
Accounts receivable, less allowances for discounts and expected credit losses of $8,045 and $5,375 in 2023 and 2022, respectively	160,282	167,638
Inventories	507,075	528,715
Unreturned customer inventories	18,240	19,695
Prepaid expenses and other current assets	26,100	25,241
Total current assets	744,223	762,439
Property, plant and equipment, net	121,872	107,148
Operating lease right-of-use assets	100,065	49,838
Goodwill	134,729	132,087
Other intangibles, net	92,308	100,504
Deferred incomes taxes	40,533	33,658
Investments in unconsolidated affiliates	24,050	41,745
Other assets	35,267	27,510
Total assets	1,293,047	1,254,929
CURRENT LIABILITIES:
Current portion of revolving credit facility	0	50,000
Current portion of term loan and other debt	5,029	5,031
Accounts payable	107,455	89,247
Sundry payables and accrued expenses	63,303	49,990
Accrued customer returns	38,238	37,169
Accrued core liability	18,399	22,952
Accrued rebates	42,278	37,381
Payroll and commissions	29,561	31,361
Total current liabilities	304,263	323,131
Long-term debt	151,182	184,589
Noncurrent operating lease liabilities	88,974	40,709
Other accrued liabilities	25,742	22,157
Accrued asbestos liabilities	72,013	63,305
Total liabilities	642,174	633,891
Commitments and contingencies
Stockholders' equity:
Common Stock - par value $2.00 per share: Authorized 30,000,000 shares, issued 23,936,036 shares	47,872	47,872
Capital in excess of par value	101,751	105,615
Retained earnings	573,226	564,242
Accumulated other comprehensive income	(5,974)	(12,470)
Treasury stock - at cost (2,018,982 shares and 2,350,377 shares in 2023 and 2022, respectively)	(81,811)	(95,239)
Total SMP stockholders' equity	635,064	610,020
Noncontrolling Interest	15,809	11,018
Total Stockholders' Equity	650,873	621,038
Total liabilities and stockholders' equity	$ 1,293,047	$ 1,254,929

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS:
Accounts receivable, allowances for discounts and expected credit losses	$ 8,045	$ 5,375
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)	2,018,982	2,350,377

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 34,352	$ 55,435	$ 90,954
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	29,022	28,298	27,243
Amortization of deferred financing cost	491	421	228
Increase (decrease) to allowance for expected credit losses	2,943	(757)	451
Increase (decrease) to inventory reserves	3,068	6,035	(585)
Customer bankruptcy charge	0	7,002	0
Equity income from joint ventures	(2,070)	(3,464)	(3,295)
Employee Stock Ownership Plan allocation	2,966	2,296	2,513
Stock-based compensation	6,598	8,178	9,479
(Increase) in deferred income taxes	(6,952)	(713)	(1,801)
Increase in tax valuation allowance	674	1,068	466
Loss on discontinued operations, net of tax	28,996	17,691	8,467
Change in assets and liabilities:
Decrease in accounts receivable	7,965	6,916	28,464
(Increase) decrease in inventories	29,494	(67,495)	(107,609)
(Increase) in prepaid expenses and other current assets	(70)	(5,509)	(843)
Increase (decrease) in accounts payable	19,645	(48,604)	33,046
Increase (decrease) in sundry payables and accrued expenses	(4,284)	(29,089)	13,430
Net changes in other assets and liabilities	(8,578)	(5,242)	(15,044)
Net cash provided by (used in) operating activities	144,260	(27,533)	85,564
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of and investment in businesses	(3,954)	(1,934)	(125,419)
Cash acquired in step acquisition	6,779	0	0
Capital expenditures	(28,633)	(25,956)	(25,875)
Other investing activities	108	73	45
Net cash used in investing activities	(25,700)	(27,817)	(151,249)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under the term loan	0	100,000	0
Repayments of term loan	(5,000)	(2,500)	0
Net borrowings (repayments) under revolving credit facilities	(78,500)	16,702	115,298
Net borrowings (repayments) of other debt and lease obligations	(58)	(2,895)	3,048
Purchase of treasury stock	0	(29,656)	(26,862)
Payments of debt issuance costs	0	(2,128)	0
Increase (decrease) in overdraft balances	(189)	(595)	247
Dividends paid	(25,164)	(23,428)	(22,179)
Dividends paid to noncontrolling interest	(700)	0	(540)
Net cash provided by (used in) financing activities	(109,611)	55,500	69,012
Effect of exchange rate changes on cash	2,427	(755)	(1,060)
Net increase (decrease) in cash and cash equivalents	11,376	(605)	2,267
CASH AND CASH EQUIVALENTS at beginning of year	21,150	21,755	19,488
CASH AND CASH EQUIVALENTS at end of year	32,526	21,150	21,755
Cash paid during the year for:
Interest	14,597	9,892	1,721
Income taxes	$ 16,019	$ 25,015	$ 26,323

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total SMP [Member]	Non-controlling Interest [Member]	Total
Balance at beginning of period at Dec. 31, 2020	$ 47,872	$ 105,084	$ 463,612	$ (5,676)	$ (60,656)	$ 550,236	$ 0	$ 550,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interest in business step acquisition	0	0	0	0	0	0	11,504	11,504
Net earnings	0	0	90,886	0	0	90,886	68	90,954
Other comprehensive loss, net of tax	0	0	0	(2,493)	0	(2,493)	15	(2,478)
Cash dividends paid	0	0	(22,179)	0	0	(22,179)	0	(22,179)
Purchase of treasury stock	0	0	0	0	(26,862)	(26,862)	0	(26,862)
Dividends paid to noncontrolling interest	0	0	0	0	0	0	(540)	(540)
Stock-based compensation	0	159	0	0	9,320	9,479	0	9,479
Employee Stock Ownership Plan	0	134	0	0	2,379	2,513	0	2,513
Balance at end of period at Dec. 31, 2021	47,872	105,377	532,319	(8,169)	(75,819)	601,580	11,047	612,627
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0	0	55,351	0	0	55,351	84	55,435
Other comprehensive loss, net of tax	0	0	0	(4,301)	0	(4,301)	(113)	(4,414)
Cash dividends paid	0	0	(23,428)	0	0	(23,428)	0	(23,428)
Purchase of treasury stock	0	0	0	0	(29,656)	(29,656)	0	(29,656)
Stock-based compensation	0	(131)	0	0	8,309	8,178	0	8,178
Employee Stock Ownership Plan	0	369	0	0	1,927	2,296	0	2,296
Balance at end of period at Dec. 31, 2022	47,872	105,615	564,242	(12,470)	(95,239)	610,020	11,018	621,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interest in business step acquisition	0	0	0	0	0	0	5,273	5,273
Net earnings	0	0	34,148	0	0	34,148	204	34,352
Other comprehensive loss, net of tax	0	0	0	6,496	0	6,496	14	6,510
Cash dividends paid	0	0	(25,164)	0	0	(25,164)	0	(25,164)
Dividends paid to noncontrolling interest	0	0	0	0	0	0	(700)	(700)
Stock-based compensation	0	(3,880)	0	0	10,478	6,598	0	6,598
Employee Stock Ownership Plan	0	16	0	0	2,950	2,966	0	2,966
Balance at end of period at Dec. 31, 2023	$ 47,872	$ 101,751	$ 573,226	$ (5,974)	$ (81,811)	$ 635,064	$ 15,809	$ 650,873

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY [Abstract]
Cash dividends paid (in dollars per share)	$ 1.16	$ 1.08	$ 1

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies Principles of Consolidation 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 two segments, Vehicle Control and Temperature Control, while our Engineered Solutions segment offers a broad array of conventional and future-oriented technologies in markets for commercial and light vehicles, construction, agriculture, power sports, marine, hydraulics and lawn and garden. We sell our products primarily to retailers, warehouse distributors, original equipment manufacturers and original equipment service part operations in the United States, Canada, Europe, Asia, Mexico and other Latin American countries The consolidated financial statements include our accounts and all domestic and international companies in which we have more than a 50% equity ownership, except in instances where the minority shareholder maintains substantive participating rights, in which case we follow the equity method of accounting. In instances where we have more than a 50% equity ownership and the minority shareholder does not maintain substantive participating rights, our consolidated financial statements include the accounts of the company on a consolidated basis with its net income and equity reported at amounts attributable to both our equity position and that of the noncontrolling interest. Investments in unconsolidated affiliates are accounted for on the equity method, as we do not have a controlling financial interest but have the ability to exercise significant influence. All significant inter-company items have been eliminated Use of Estimates T he 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 Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2023 presentation. Reportable Segments Beginning on January 1, 2023, we reorganized our business into three operating segments – Vehicle Control, Temperature Control and Engineered Solutions. The new operating segment structure better 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. Prior period segment results have been reclassified to conform to our operating segment reorganization. For additional information related to our segment reorganization, see Note 8, “Goodwill and Acquired Intangible Assets,” Note 21, “Industry Segment and Geographic Data” and Note 22, “Net Sales.” 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 $42.9 million and $42.5 million as of December 31, 2023 and 2022, 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 as unreturned customer inventory 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 Building improvements 10 to 25 years Machinery and equipment 5 to years Tools, dies and auxiliary equipment 3 to years Furniture and fixtures 3 to 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. Valuation of Long-Lived and Intangible Assets and Goodwill At acquisition, we estimate and record the fair value of purchased intangible assets, which primarily consist of customer relationships, trademarks and trade names, patents, developed technology and intellectual property, and non-compete agreements. 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. As related to valuing customer relationships, significant estimates and assumptions used include but are not limited to: (1) forecasted revenues attributable to existing customers; (2) forecasted earnings before interest and taxes (“EBIT”) margins; (3) customer attrition rates; and (4) the discount rate. Goodwill is the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. 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. We assess the impairment of long‑lived assets, identifiable intangibles assets and goodwill 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 goodwill quantitative impairment test. In performing the quantitative 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 remains there until the underlying foreign operation is liquidated or substantially disposed of. Foreign currency transaction gains or losses are recorded in the statement of operations under the caption “other non-operating income (expense), net.” Revenue Recognition We derive our revenue primarily from vehicle aftermarket sales in our Vehicle Control and Temperature Control 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 providing 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 must be made and used 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 -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 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 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 must be made and used 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. Deferred Financing Costs Deferred financing costs represent costs incurred in conjunction with our debt financing activities. Deferred financing costs related to our term loan and revolving credit facilities are capitalized and amortized over the life of the related financing arrangement. If the debt is retired early, the related unamortized deferred financing costs are written off in the period the debt is retired and are recorded in the statement of operations under the caption other non-operating income (expense), net. 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. The valuation allowance of as of December 31, 2023 is intended to provide for the uncertainty regarding the ultimate realization of our U.S. foreign tax credit carryovers. Based on these considerations, we believe it is more likely than not that we will realize the benefit of the net deferred tax asset of as of December 31, 2023 which is net of the remaining valuation allowance. 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. During the years ended December 31, 2023, 2022 and 2021 we did not establish a liability for uncertain tax positions. Environmental Reserves We are subject to various U.S. Federal and state and local environmental laws and regulations and are involved in certain environmental remediation efforts. We estimate and accrue our liabilities resulting from such matters based upon a variety of factors including the assessments of environmental engineers and consultants who provide estimates of potential liabilities and remediation costs. Such estimates are not discounted to reflect the time value of money due to the uncertainty in estimating the timing of the expenditures, which may extend over several years. Potential recoveries from insurers or other third parties of environmental remediation liabilities are recognized independently from the recorded liability, and any asset related to the recovery will be recognized only when the realization of the claim for recovery is deemed probable. 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: (1) historical data available from publicly available studies; (2) an analysis of our recent claims history to estimate likely filing rates into the future; (3) an analysis of our currently pending claims; (4) an analysis of our settlements and awards of asbestos-related damages to date; and (5) an analysis of closed claims with pay ratios and lag patterns in order to develop average future settlement values. Based on the information contained in the actuarial study and all other available information considered by us, we have concluded that no amount within the range of settlement payments and awards of asbestos-related damages was more likely than any other and, therefore, in assessing our asbestos liability we compare the low end of the range to our recorded liability to determine if an adjustment is required. 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 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. In January 2023, one of our customers filed a petition for bankruptcy. In connection with the bankruptcy filing, we evaluated our potential risk and exposure as related to our outstanding accounts receivable balance from the customer as of December 31, 2022, and estimated our anticipated recovery. As a result of our evaluation, we recorded a $7 million pre-tax charge during the year ended December 31, 2022 to reduce our accounts receivable balance to our estimated recovery. The $7 million pre-tax charge was included in selling, general and administrative expenses in our consolidated statement of operation s. The bankruptcy court proceedings have continued into 2023. Although the courts have named us a “critical supplier,” the funds allocated to us have not yet been determined and, as such, we have not recorded an adjustment to the $7 million pre-tax charge previously recorded. 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, 2023 and 2022 were uninsured. Foreign cash balances at December 31, 2023 and 2022 were and , 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 interest rate hedges (“interest rate swap agreements”), 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). 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 Issued Accounting Pronouncements Standards that are not yet adopted as of December 31, 2023 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required income effective tax rate reconciliation disclosures to include disclosure of (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, the ASU 2023-09 will expand required 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

Business Acquisitions and Inves

Business Acquisitions and Investments	12 Months Ended
	Dec. 31, 2023
Business Acquisitions and Investments [Abstract]
Business Acquisitions and Investments	2. Business Acquisitions and Investments 2023 Increase in Equity Investment Investment in Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. In April 2014, we formed Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (“Gwo Yng”), a 50/50 joint venture with Gwo Yng Enterprise Co., Ltd., a China-based manufacturer of air conditioner accumulators, filter driers, hose assemblies and switches. We acquired our 50% interest in the joint venture for approximately $14 million. In March 2018, we acquired an additional 15% equity interest in the joint venture for RMB 26,475,583 (approximately $4.2 million), thereby increasing our equity interest in the joint venture to 65%. While we increased our equity interest in the joint venture to 65%, the minority shareholder maintained substantive participating rights that allowed it to participate in certain significant financial and operating decisions that occur in the ordinary course of business. As a result, we continued to account for our investment in the joint venture under the equity method of accounting. In July 2023, we acquired an additional 15% equity interest in the joint venture for 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 (1) $ 21,725 Assets acquired and liabilities assumed: Cash and cash equivalents $ 6,779 Receivables 5,912 Inventory 5,945 Other current assets 528 Property, plant and equipment, net 2,924 Operating lease right-of-use assets 4,372 Intangible assets (2) 532 Goodwill 2,208 Long term investments and other assets 7,257 Current liabilities (6,004 ) Noncurrent operating lease liabilities (3,455 ) Subtotal 26,998 Fair value of acquired noncontrolling interest (5,273 ) Total purchase consideration allocated to net assets acquired $ 21,725 (1) Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest. (2) Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million. Intangible assets of $0.4 million consisting of customer relationships will be amortized on a straight-line basis over the estimated useful life of 10 years. Goodwill of $2.2 million was allocated to the Temperature Control and Engineered Solutions segments in the amounts of $1.2 million and $1 million, respectively. The goodwill reflects relationships, business specific knowledge and the replacement cost of an assembled workforce associated with personal reputations. Revenues from Gwo Yng included in our consolidated statement of operations from the closing date of our 15% equity increase in July 2023 through December 31, 2023 were not material. 2022 Increase in Equity Investment 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”) for approximately $5.1 million. CYJ is a manufacturer of automotive electric air conditioning compressors and is located in China. We determined, at that time, that due to a lack of a voting majority and other qualitative factors, we do not control the operations of CYJ and accordingly, our investment in CYJ would be accounted for under the equity method of accounting. In October 2022, we acquired an additional 3.55% equity interest in CYJ for RMB 1.7 million (approximately $242,000), increasing our minority ownership interest in CYJ from an approximate interest of 29% to 33%. The additional acquired ownership interest in CYJ was paid for in cash funded by borrowings under our Credit Agreement with JPMorgan Chase Bank, N.A., as agent. We will continue to account for our minority interest in CYJ using the equity method of accounting. 2022 Business Acquisitions Acquisition of Capital Stock of Kade Trading GmbH (“Kade”) In October 2022, we acquired 100% of the capital stock of Kade Trading GmbH (“Kade”) headquartered in Glinde, Germany for Euros 2.7 million (approximately $2.7 million) plus a Euros 0.5 million (approximately $0.5 million) earn-out based upon Kade’s performance in 2024 and 2025. Kade is a supplier across Europe of mobile temperature control components to commercial vehicle, passenger car and specialty equipment markets and has been a distributor of products from our joint ventures including electric compressors, hose assemblies and receiver dryers, with annual sales of approximately $6 million. The acquired Kade business, reported as part of our Engineered Solutions segment, was paid for with cash. The following table presents the allocation of the purchase price to the assets acquired and liabilities assumed based on their fair values (in thousands): Purchase price $ 3,176 Assets acquired and liabilities assumed: Receivables $ 790 Inventory 829 Other current assets (1) 1,003 Property, plant and equipment, net 63 Operating lease right-of-use assets 401 Intangible assets 2,395 Goodwill 766 Current liabilities (1,977 ) Noncurrent operating lease liabilities (328 ) Deferred income taxes (766 ) Net assets acquired $ 3,176 (1) The other current assets balance includes $1 million of cash acquired. Intangible assets acquired of $2.4 million consist of customer relationships that will be amortized on a straight-line basis over the estimated useful life of 15 years. Incremental revenues from the acquired Kade business included in our consolidated statement of operations for the year ended December 31, 2023 were $5 million.

Restructuring and Integration E

Restructuring and Integration Expenses	12 Months Ended
	Dec. 31, 2023
Restructuring and Integration Expenses [Abstract]
Restructuring and Integration Expenses	3. Restructuring and Integration Expenses The aggregated liabilities included in “sundry payables and accrued expenses” and “other accrued liabilities” in the consolidated balance sheet relating to the restructuring and integration activities as of and for the years ended December 31, 2023 and 2022, consisted of the following (in thousands): Workforce Reduction Other Exit Costs Total Exit activity liability at December 31 2021 $ 79 $ — $ 79 Restructuring and integration costs: Amounts provided for during 2022 (1) 1,521 370 1,891 Cash payments (16 ) (144 ) (160 ) Reclassification of environmental and other liabilities (63 ) (226 ) (289 ) Exit activity liability at December 31 2022 $ 1,521 $ — $ 1,521 Restructuring and integration costs: Amounts provided for during 2023 (1) (2) 1,973 669 2,642 Cash payments (1,803 ) (577 ) (2,380 ) Reclassification of environmental liability — (92 ) (92 ) Foreign currency exchange rate changes 38 — 38 Exit activity liability at December 31 2023 $ 1,729 $ — $ 1,729 (1) Included in restructuring and integration costs in 2023 and 2022 is a $0.1 million and $0.2 million increase, respectively, in environmental cleanup costs related to ongoing monitoring and remediation in connection with the prior closure of our manufacturing operations at our Long Island City, New York location. The environmental liability has been reclassed to accrued liabilities as of December 31, 2023 and 2022, respectively. (2) Restructuring and integration expenses incurred during the year ended December 31, 2023 consist of $1.3 million in our Vehicle Control segment, $1.1 million in our Temperature Control segment and $0.2 million in our Engineered Solutions segment. Restructuring Costs Cost Reduction Initiative During the fourth quarter of 2022, to further our ongoing efforts to improve operating efficiencies and reduce costs, we announced plans for a reduction in our sales force, and initiated plans to relocate certain product lines from our Independence, Kansas manufacturing facility and from our St. Thomas, Canada manufacturing facility to our manufacturing facilities in Reynosa, Mexico Total restructuring expenses related to the initiative of approximately $2.5 million and $1.5 million were incurred during the years ended December 31, 2023 and 2022, respectively. Expenses for the year ended December 31, 2023 consist of (1) expenses of approximately $0.7 million related to a further sales force reduction, (2) expenses of approximately $1.3 million of employee severance and bonuses related to our product line relocations, and (3) expenses of approximately $0.5 million related to the relocation of machinery and equipment to our manufacturing facilities in Reynosa, Mexico. Expenses for the year ended December 31, 2022 consist of (1) expenses of approximately $0.9 million related to our sales force reduction, and (2) expenses of approximately $0.6 million consisting of employee severance related to our product line relocations. Cash payments made under the initiative were $2.4 million during the year ended December 31, 2023. Additional restructuring costs related to the initiative, and expected to be incurred, are approximately $0.5 million. We anticipate that the Cost Reduction Initiative will be completed by the end of the second quarter of 2024 Plant Rationalization Programs The 2016 Plant Rationalization Program, which included the shutdown and sale of our Grapevine, Texas facility, and the 2017 Orlando Rationalization Program, which included the shutdown of our Orlando, Florida facility, have been completed. Cash payments made of $16,000 during the year ended December 31, 2022 consist of severance payments to former employees terminated in connection with these programs. There is no remaining aggregate liability related to these programs as of December 31, 2022. Integration Costs Particulate Matter Senso r (“Soot Sensor”) Product Line Relocation In connection with our acquisitions in March 2021 and November 2021 of certain soot sensor product lines from Stoneridge, Inc., we incurred certain integration expenses in connection with the relocation of certain inventory, machinery, and equip ment from Stoneridge’s facilities in Lexington, Ohio and Tallinn, Estonia to our existing facilities in Independence, Kansas and Bialystok, Poland, respectively. Integration expenses recognized and cash payments made of $144,000 during the year ended December 31, 2022 related to these relocation activities.The soot sensor product line relocation has been completed and there is no remaining aggregate liability related to the soot sensor product line relocation as of December 31, 2022.

Sale of Receivables

Sale of Receivables	12 Months Ended
	Dec. 31, 2023
Sale of Receivables [Abstract]
Sale of Receivables	4. 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 Pursuant to these agreements, we sold $830.8 million and $813.7 million of receivables for the years ended December 31, 2023 and 2022, respectively. Receivables presented at financial institutions and not yet collected as of December 31, 2023 were $4.5 million and remained in our accounts receivable balance as of that date. There were no receivables presented at financial institutions and not yet collected as of December 31, 2022. 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 $46 million, $32 million and $11.5 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, 2023, 2022 and 2021, 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, 2023
Inventories [Abstract]
Inventories	5. Inventories December 31, 2023 2022 (In thousands) Finished goods $ 302,557 $ 324,362 Work-in-process 18,503 14,099 Raw materials 186,015 190,254 Subtotal 507,075 528,715 Unreturned customer inventories 18,240 19,695 Total inventories $ 525,315 $ 548,410

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	6. Property, Plant and Equipment December 31, 2023 2022 (In thousands) Land, buildings and improvements $ 45,710 $ 42,651 Machinery and equipment 177,337 166,149 Tools, dies and auxiliary equipment 73,494 67,017 Furniture and fixtures 33,212 32,084 Leasehold improvements 16,418 15,083 Construction-in-progress 35,357 23,340 Total property, plant and equipment 381,528 346,324 Less accumulated depreciation 259,656 239,176 Total property, plant and equipment, net $ 121,872 $ 107,148 Depreciation expense was $19.7 million in 2023, $19 million in 2022 and $18.2 million in 2021.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	7. Leases Quantitative Lease Disclosures 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 eleven years, some of which may include or more 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 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 : Balance Sheet Information December 31, Assets 2023 2022 Operating lease right-of-use assets $ 100,065 $ 49,838 Liabilities Sundry payables and accrued expenses $ 17,139 $ 10,763 Noncurrent operating lease liabilities 88,974 40,709 Total operating lease liabilities $ 106,113 $ 51,472 Weighted Average Remaining Lease Term Operating leases 8.3 Years 7 Years Weighted Average Discount Rate Operating leases 4.8 % 3.7 % Year Ended, December 31, Expense and Cash Flow Information 2023 2022 Lease Expense Operating lease expense (a) $ 16,434 $ 11,411 Supplemental Cash Flow Information Cash Paid for the amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 12,099 $ 11,293 Right-of-use assets obtained in exchange for new lease obligations: Operating leases (b) $ 66,014 $ 31,064 (a) Excludes expenses of approximately $3.3 million, $2.7 million and $2 million for the years ended December 31, 2023, 2022, and 2021, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material. (b) During the year ended December 31, 2023 includes $27.8 million of right-of-use assets related to the lease modification and extension for our distribution center and office in Lewisville, Texas; $26.1 million of right-of-use assets related to the new distribution center in Shawnee, Kansas; $4.4 million of right-of-use assets obtained in Gwo Yng step-acquisition; and $3.7 million of right-of-use assets related to our Reynosa, Mexico lease renewal. Minimum Lease Payments At December 31, 2023, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows (in thousands): 2024 $ 17,607 2025 16,145 2026 14,814 2027 13,671 2028 11,415 Thereafter 58,059 Total lease payments $ 131,711 Less: Interest (25,598 ) Present value of lease liabilities $ 106,113

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Other Intangible Assets [Abstract]
Goodwill and Other Intangible Assets	8. Goodwill and Other Intangible Assets Goodwill We assess the impairment of long ‑ 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 goodwill quantitative impairment test. In performing the quantitative 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. In connection with our operating segment reorganization, 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. We completed our annual impairment test of goodwill as of December 31, 2023. As of December 31, 2023, we performed a qualitative assessment of the likelihood of a goodwill impairment for the Vehicle Control, Temperature Control and Engineered Solutions reporting units. Based upon our qualitative assessment, we determined that it was not more likely than not that the fair value of the each of the Vehicle Control, Temperature Control and Engineered Solutions reporting units was less than their respective carrying amounts. As such, we concluded that the quantitative impairment test would not be required, and that there would be no required goodwill impairment charge as of December 31, 2023 at each of the reporting units. While we concluded that we did not have a goodwill impairment charge as of December 31, 2023, and we do not believe that future impairments are probable, we will need to maintain the current ongoing performance levels at each of the Vehicle Control, Temperature Control and Engineered Solutions reporting units in future periods to sustain their goodwill carrying values. Changes in the carrying values of goodwill by operating segment during the years ended December 31, 2023 and 2022 are as follows (in thousands): Vehicle Control Temperature Control Engineered Solutions Total Balance as of December 31 2021 Goodwill $ 129,318 $ 10,839 $ 29,983 $ 170,140 Accumulated impairment losses (38,488 ) — — (38,488 ) $ 90,830 $ 10,839 $ 29,983 $ 131,652 Activity in 2022 Acquisition of Kade — 582 184 766 Foreign currency exchange rate change (310 ) 53 (74 ) (331 ) 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 exchange rate change 286 42 106 434 Balance as of December 31 Goodwill 129,294 12,730 31,193 173,217 Accumulated impairment losses (38,488 ) — — (38,488 ) $ 90,806 $ 12,730 $ 31,193 $ 134,729 Acquired Intangible Assets Acquired identifiable intangible assets as of December 31, 2023 and 2022 consist of: December 31, 2023 2022 (In thousands) Customer relationships $ 159,641 $ 158,717 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 8,880 8,880 Non-compete agreements 3,295 3,282 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets 186,899 185,962 Less accumulated amortization (1) (95,681 ) (86,945 ) Net acquired intangible assets $ 91,218 $ 99,017 (3) Applies to all intangible assets, except for a related trademark/trade name totaling $2.6 million, which has an indefinite useful life and, as such, is not being amortized. Total amortization expense for acquired intangible assets was $8.5 million for the year ended December 31, 2023, $8.6 million for the year ended December 31, 2022, and $8.7 million for the year ended December 31, 2021. Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $8.5 million for 2024, $8.5 million in 2025, $8.5 million in 2026, $8.4 million in 2027 and $54.7 million in the aggregate for the years 2028 through 2041. For information related to identified intangible assets acquired in the Kade acquisition and Gwo Yng step 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, 2023 and 2022 totaled $19.1 million and , respectively

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates	12 Months Ended
	Dec. 31, 2023
Investments in Unconsolidated Affiliates [Abstract]
Investments in Unconsolidated Affiliates	9. Investments in Unconsolidated Affiliates December 31, 2023 2022 (In thousands) Foshan FGD SMP Automotive Compressor Co. Ltd $ 18,426 $ 16,747 Foshan Che Yijia New Energy Technology Co., Ltd. 3,128 4,098 Orange Electronic Co. Ltd 2,496 2,490 Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. — 18,410 Total $ 24,050 $ 41,745 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 China-based manufacturer of automotive belt driven air conditioning compressors. 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, 2023 and 2022, we made purchases from the joint venture of approximately and Investment in Foshan Che Yijia New Energy Technology Co., Ltd. In August we acquired an approximate minority interest in Foshan Che Yijia New Energy Technology Co., Ltd. (“CYJ”) for approximately . CYJ is a manufacturer of automotive electric air conditioning compressors and is located in China. Our minority interest in CYJ is accounted for using the equity method of accounting. 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, 2023 were $4 million. In October 2022, we acquired an additional 3.55% equity interest in CYJ for RMB 1.7 million (approximately $242,000), increasing our minority ownership interest in CYJ from an approximate interest of 29% to 33%. We will continue to account for our minority interest in CYJ using the equity method of accounting. During the years ended December 31, 2023 and 2022, purchases we made from CYJ were not material. Investment in Orange Electronic Co. Ltd. In January 2013, we acquired a minority interest in Orange Electronic Co., Ltd. (“Orange”) for $6.3 million. Orange is a manufacturer of tire pressure monitoring system sensors and is located in Taiwan. As of December 31, 2022, our minority interest in Orange of 19.4% is accounted for using the equity method of accounting as we have the ability to exercise significant influence. During the years ended December 31, 2023 and 2022, we made purchases from Orange of approximately $3.2 million and $4.5 million, respectively. Investment in Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. In April 2014, we formed Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (“Gwo Yng”), a 50/50 joint venture with Gwo Yng Enterprise Co., Ltd., a China-based manufacturer of air conditioner accumulators, filter driers, hose assemblies and switches. We acquired our 50% interest in the joint venture for approximately $14 million. In March 2018, we acquired an additional 15% equity interest in the joint venture for RMB 26,475,583 (approximately $4.2 million), thereby increasing our equity interest in the joint venture to 65%. While we increased our equity interest in the joint venture to 65%, the minority shareholder maintained substantive participating rights that allowed it to participate in certain significant financial and operating decisions that occur in the ordinary course of business. As a result, we continued to account for our investment in the joint venture under the equity method of accounting. In July 2023, we acquired an additional 15% equity interest in the joint venture for 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 will be accounted for as a business combination achieved in stages (“a step acquisition”). Accordingly, commencing on the closing of the transaction, we will report the results of Gwo Yng on a consolidated basis with the minority ownership interest reported as a noncontrolling interest. During the year ended December 31, 2023 and through the date of our step acquisition in July 2023, we made purchases from the joint venture of approximately $10.3 million. Purchases made from the joint venture approximated $16.2 million during the year ended December 13, 2022. For additional information related to Gwo Yng, see Note 2, “Business Acquisitions and Investments,” of the notes to our consolidated financial statements.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2023
Other Assets [Abstract]
Other Assets	10. Other Assets December 31, 2023 2022 (In thousands) Deferred compensation $ 23,893 $ 20,190 Long-term investments 7,468 — Noncurrent portion of interest rate swap fair value 1,944 3,091 Deferred financing costs, net 1,125 1,603 Other 837 2,626 Total other assets, net $ 35,267 $ 27,510 Def erred compensation consists of assets held in a nonqualified defined contribution pension plan as of December 31, 2023 and 2022, respectively. Long term investments as of December 31, 2023 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, 2023
Credit Facilities and Long-Term Debt [Abstract]
Credit Facilities and Long-Term Debt	11. Credit Facilities and Long-Term Debt Total debt outstanding is summarized as follows: December 31, 2023 2022 (In thousands) Credit facility – term loan due 2027 $ 92,500 $ 97,500 Credit facility – revolver due 2027 63,500 142,000 Other 211 120 Total debt $ 156,211 $ 239,620 Current maturities of debt $ 5,029 $ 55,031 Long-term debt 151,182 184,589 Total debt $ 156,211 $ 239,620 Term Loan and Revolving Credit Facilities In June 2022, the Company entered into a new Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders (the “Credit Agreement”). The Credit Agreement provides for a $500 million credit facility comprised of a $100 million term loan facility (the “term loan”) and a $400 million multi-currency revolving credit facility available in U.S. Dollars, Euros, Sterling, Swiss Francs, Canadian Dollars and other currencies as agreed to by the administrative agent and the lenders (the “revolving facility”). The Credit Agreement replaces and refinances the 2015 Credit Agreement. Borrowings under the Credit Agreement were used to repay all outstanding borrowings under the 2015 Credit Agreement, and pay certain fees and expenses incurred in connection with the Credit Agreement, with future borrowings used for other general corporate purposes of the Company and its subsidiaries. The term loan amortizes in quarterly installments of 1.25% in each of the first four years, and quarterly installments of 2.5% in the fifth year of the Credit Agreement. The revolving facility has a $25 million sub-limit for the issuance of letters of credit and a $25 million sub-limit for the borrowing of swingline loans. The maturity date is June 1, 2027. The Company may request up to two one-year extensions of the maturity date. The Company may, upon the agreement of one or more then existing lenders or of additional financial institutions not currently party to the Credit Agreement, increase the revolving facility commitments or obtain incremental term loans by an aggregate amount not to exceed (x) the greater of (i) $168 million or (ii) 100% of consolidated EBITDA (as defined in the Credit Agreement) for the four fiscal quarters ended most recently before such date, plus (y) the amount of any voluntary prepayment of term loans, plus (z) an unlimited amount so long as, immediately after giving effect thereto, the pro forma First Lien Net Leverage Ratio (as defined in the Credit Agreement) does not exceed 2.5 to 1.0. Term loan and revolver facility borrowings in U.S. Dollars bear interest, at the Company’s election, at a rate per annum equal to Term SOFR plus 0.10% plus an applicable margin, or an alternate base rate plus an applicable margin, where the alternate base rate is the greater of the prime rate, the federal funds effective rate plus 0.50%, and one-month Term SOFR plus 0.10% plus 1.00%. Term loan borrowings were made at one-month Term SOFR. The applicable margin for the term benchmark borrowings ranges from 1.0% to 2.0%, and the applicable margin for alternate base rate borrowings ranges from 0% to 1.0%, in each case, based on the total net leverage ratio of the Company and its restricted subsidiaries. The Company may select interest periods of one, three or nine months for Term SOFR borrowings. Interest is payable at the end of the selected interest period, but no less frequently than quarterly. The Company’s obligations under the Credit Agreement are guaranteed by its material domestic subsidiaries (each, a “Guarantor”), and secured by a first priority perfected security interest in substantially all of the existing and future personal property of the Company and each Guarantor, subject to certain exceptions. The collateral security described above also secures certain banking services obligations and interest rate swaps and currency or other hedging obligations of the Company owing to any of the then existing lenders or any affiliates thereof. Concurrently with the Company’s entry into the Credit Agreement, the Company also entered into a seven year interest rate swap agreement with Wells Fargo Bank, N.A., Co-Syndication Agent and lender under the Credit Agreement, on $100 million of borrowings under the Credit Agreement. The interest rate swap agreement matures in May 2029. Outstanding borrowings at December 31, 2023 under the Credit Agreement were $156 million, consisting of current borrowings of $5 million and long-term debt of $151 million; while outstanding borrowings at December 31, 2022 were $239.5 million, consisting of current borrowings of $55 million and long-term debt of $184.5 million. Letters of credit outstanding under the Credit Agreement were $2.3 million and $2.4 million at December 31, 2023 and 2022, respectively. At December 31, 2023, the weighted average interest rate under our Credit Agreement was 5%, which consisted of $156 million in borrowings at 5% under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings. At December 31, 2022, the weighted average interest rate under our Credit Agreement was 5.2%, which consisted of $237 million in borrowings at 5.2% under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings, and an alternative base rate borrowing of $2.5 million at 8%. During the year ended December 31, 2023, our average daily alternative base rate loan balance was $0.1 million, compared to a balance of $5.6 million for the year ended December 31, 2022. The Credit Agreement contains customary covenants limiting, among other things, the incurrence of additional indebtedness, the creation of liens, mergers, consolidations, liquidations and dissolutions, sales of assets, dividends and other payments in respect of equity interests, acquisitions, investments, loans and guarantees, subject, in each case, to customary exceptions, thresholds and baskets. The Credit Agreement also contains customary events of default. Polish Overdraft Facility I n 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 December 31, 2023 and Maturities of Debt As of December 31, 2023, maturities of debt through 2027, assuming no prepayments, are as follows (in thousands): Revolving Credit Facility Term Loan Facility Polish Overdraft Facility and Other Debt Total 2024 $ — $ 5,000 $ 29 $ 5,029 2025 — 5,000 31 5,031 2026 — 7,500 49 7,549 2027 63,500 75,000 102 138,602 Total $ 63,500 $ 92,500 $ 211 $ 156,211 Less: current maturities — (5,000 ) (29 ) (5,029 ) Long-term debt $ 63,500 $ 87,500 $ 182 $ 151,182 Deferred Financing Costs We have deferred financing costs of approximately $1.6 million and $2.1 million as of December 31, 2023 and 2022, resp ectively. Deferred financing costs are related to our term loan and revolving credit facilities. Deferred financing costs as of December 31, 2023, assuming no prepayments, are being amortized in the amounts of $0.5 million in 2024, $0.5 million in 2025, $0.5 million in 2026 and $0.1 million in 2

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income	12. Accumulated Other Comprehensive Income Changes in Accumulated Other Comprehensive Income by Component (in thousands) Foreign Currency Translation Unrecognized Postretirement Benefit Costs (Credit) Unrealized derivative gains (losses) Total Balance at December 31, 2021 attributable to SMP $ (8,221 ) $ 52 $ — $ (8,169 ) Other comprehensive income before reclassifications (8,109 ) — 3,797 (1) (4,312 ) Amounts reclassified from accumulated other comprehensive income — (15 ) 26 11 Other comprehensive income, net (8,109 ) (15 ) 3,823 (4,301 ) Balance at December 31, 2022 attributable to SMP $ (16,330 ) $ 37 $ 3,823 $ (12,470 ) Other comprehensive income before reclassifications 7,433 — 831 (1) 8,264 Amounts reclassified from accumulated other comprehensive income — (13 ) (1,755 ) (1,768 ) Other comprehensive income, net 7,433 (13 ) (924 ) 6,496 Balance at December 31, 2023 attributable to SMP $ (8,897 ) $ 24 $ 2,899 $ (5,974 ) (1) Consists of 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; and the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $5.2 million ($3.8 million, net of tax) minus cash settlement payments of $42,000 ($31,000, net of tax) in the year December 31, 2022. Reclassifications Out of Accumulated Other Comprehensive Income (in thousands): Year Ended December 31, Details About Accumulated Other Comprehensive Income Components 2023 2022 Derivative cash flow hedge: Unrecognized gain (loss) (1) $ (2,372 ) $ 35 Postretirement Benefit Plans: Unrecognized gain (loss) (2) (22 ) (25 ) Total before income tax (2,394 ) 10 Income tax expense (benefit) (626 ) (1 ) Total reclassifications attributable to SMP $ (1,768 ) $ 11 (1) 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. (2) Unrecognized accumulated other comprehensive income (loss) related to our post retirement plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income (expense), net in our consolidated statements of operations (see Note 15, “Employee Benefits,” for additional information).

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2023
Stockholders' Equity [Abstract]
Stockholders' Equity	13. Stockholders’ Equity We have authority to issue 500,000 shares of preferred stock, $20 par value, and our Board of Directors is vested with the authority to establish and designate any series of preferred, to fix the number of shares therein and the variations in relative rights as between each series. In December 1995, our Board of Directors established a new series of preferred shares designated as Series A Participating Preferred Stock. The number of shares constituting the Series A Preferred Stock is 30,000. The Series A Preferred Stock is designed to participate in dividends, ranks senior to our common stock as to dividends and liquidation rights and has voting rights. Each share of the Series A Preferred Stock shall entitle the holder to one thousand votes In March 2020, our Board of Directors authorized the purchase of up to $20 million of our common stock under a stock repurchase program. Stock repurchases under this program, during the year ended December 31, 2021 were 150,273 shares of our common stock at a total cost of $6.5 million thereby completing the 2020 Board of Directors authorization. In February 2021, our Board of Directors authorized the purchase of up to an additional $20 million of our common stock under a stock repurchase program. Stock repurchases under this program during the year ended December 31, 2021 were 464,992 shares of our common stock at a total cost of $20 million, thereby completing the February In October 2021, our Board of Directors authorized the purchase of up to an additional $30 million of our common stock under a stock repurchase program. Stock repurchases under this program, during the year ended December 31, 2021 and 2022 were 7,000 and 692,067 shares of our common stock, respectively, at a total cost of $0.3 million and $29.7 million, respectively, thereby completing the October 2021 Board of Directors authorization. In July 2022, our Board of Directors authorized the purchase of up to an additional $30 million of our common stock under a new 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 no repurchases of our common stock under the program.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	12 Months Ended
	Dec. 31, 2023
Stock-Based Compensation Plans [Abstract]
Stock-Based Compensation Plans	14. 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 nonemployee directors of up to 350,000 shares. Shares issued 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 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 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 Performance-based shares issued to eligible employees are subject to a three-year measuring period and the achievement of performance targets and, depending upon the achievement of such performance targets, they may become vested no earlier than three years after the date of grant. Each period we evaluate the probability of achieving the applicable targets, and we adjust our accrual accordingly. Restricted shares (other than long-term retention restricted shares) and performance shares issued to certain key executives and directors are subject to a one Prior to the time 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 shall have no rights as a stockholder. All shares and rights are subject to forfeiture if certain employment conditions are not met. Under the amended and restated 2016 Omnibus Incentive Plan, 2,050,000 shares are authorized to be issued. At December 31, 2023, under the plan, there were an aggregate of (a) 1,633,549 shares of restricted and performance-based stock grants issued, net of forfeitures, and (b) 416,451 shares of common stock available for future grants. For the year ended December 31, 2023, 230,875 restricted and performance-based shares were granted (165,125 restricted shares and 65,750 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 $6.2 million ($4.8 million, net of tax), $7.6 million ($5.7 million, net of tax) and $9.1 million ($6.9 million, net of tax), for the years ended December 31, 2023, 2022 and 2021, respectively. The unamortized compensation expense related to our restricted and performance-based shares was $13.3 million and $14.9 million at December 31, 2023 and 2022, respectively and is expected to be recognized over a weighted average period of 4.1 years and 0.3 years for employees and directors, respectively, as of December 31, 2023 and over a weighted average period of 4.3 years and 0.3 years for employees and directors, respectively, as of December 31, 2022. Our restricted and performance-based share activity was as follows for the years ended December 31, 2023 and 2022: Shares Weighted Average Grant Date Fair Value per Share Balance at December 31 2021 807,019 $ 34.92 Granted 246,325 28.44 Vested (190,082 ) 41.71 Performance Shares Target Adjustment 25,317 42.21 Forfeited (7,750 ) 40.73 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 The weighted-average grant date fair value of restricted and performance-based shares outstanding as of December 31, 2023, 2022 and 2021 was $26 million (or $29.48 per share), $28 million (or $31.79 per share), and $28.2 million (or $34.92 per share), respectively.

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2023
Employee 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, 2023 $ 10,510 2022 10,180 2021 9,763 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 2023 and 2022, contributions of $0.8 million were made related to calendar years 2022 and 2021, respectively. As of December 31, 2023, we have recorded an obligation of $0.6 million for 2023. 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 2023, we contributed to the trust an additional 72,800 shares from our treasury and released 72,800 shares from the trust leaving 200 shares remaining in the trust as of December 31, 2023. The provision for expense in connection with the ESOP was approximately $3 million in 2023, $2.3 million in 2022 and $2.5 million in 2021. Defined Benefit Pension Plan We maintain a defined benefit unfunded Supplemental Executive Retirement Plan (“SERP”). The SERP, as amended, is a defined benefit plan pursuant to which we will pay supplemental pension benefits to certain key employees upon the attainment of a contractual participant’s payment date based upon the employees’ years of service and compensation. As there are no current participants in the SERP, there was no benefit obligation outstanding related to the plan as of December 31, 2023 and 2022 and we recorded no expense related to the plan during the years ended December 31, 2023, 2022 and 2021. Postretirement Medical Benefits We provide certain medical and dental care benefits to 14 former U.S. union employees. The postretirement medical and dental benefit obligation for the former union employees as of December 31, 2023, and the net periodic benefit cost for our postretirement benefit plans for the years ended December 31, 2023, 2022 and 2021 were not material.

Other Non-Operating Income (Exp

Other Non-Operating Income (Expense), Net	12 Months Ended
	Dec. 31, 2023
Other Non-Operating Income (Expense), Net [Abstract]
Other Non-Operating Income (Expense), Net	16. Other Non-Operating Income (Expense), Net The components of other non-operating income (expense), net are as follows: Year Ended December 31, 2023 2022 2021 (In thousands) Interest and dividend income $ 517 $ 209 $ 49 Equity income from joint ventures 2,070 3,464 3,295 Gain (loss) on foreign exchange (776 ) 334 (257 ) Other non-operating income, net 515 807 407 Total other non-operating income, net $ 2,326 $ 4,814 $ 3,494

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2023
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	17. Derivative Financial Instruments Interest Rate Swap Agreements We occasionally use derivative financial instruments to reduce our market risk for changes in interest rates on our variable rate borrowings. The principal financial instruments used for cash flow hedging purposes are interest rate swap agreements. The interest rate swaps effectively convert a portion of our variable rate borrowings under our existing facilities to a fixed rate based upon determined notional amount. We do not enter into interest rate swap agreements, or other financial instruments, for trading or speculative purposes. In June 2022, we entered into a seven year interest rate swap agreement with a notional amount of $100 million that is to mature in May 2029 The fair value of the interest rate swap agreement as of December 31, 2023 and December 31, 2022 was an asset of $3.9 million and $5.2 million, respectively, which has been deferred and recorded in accumulated other comprehensive income, net of income taxes, in our consolidated balance sheet. When the interest expense on the underlying borrowing is recognized, the deferred gain/loss in accumulated other comprehensive income is recorded in earnings as interest expense in the consolidated statements of operations. We perform quarterly hedge effectiveness assessments and anticipate that the interest rate swap will be highly effective throughout its term.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
Fair Value Measurements [Abstract]
Fair Value Measurements	18. 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, 2023 and December 31, 2022 (in thousands): December 31, 2023 December 31, 2022 Fair Value Hierarchy Fair Value Carrying Amount Fair Value Carrying Amount Cash and cash equivalents (a) LEVEL 1/2 $ 32,526 $ 32,526 $ 21,150 $ 21,150 Deferred compensation LEVEL 1 23,893 23,893 20,190 20,190 Short term borrowings LEVEL 1 5,029 5,029 55,031 55,031 Long-term debt LEVEL 1 151,182 151,182 184,589 184,589 Cash flow interest rate swap LEVEL 2 3,939 3,939 5,174 5,174 Long-term investments LEVEL 2 7,468 7,468 — — (a) As of December 31, 2023 cash and cash equivalents 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 and cash equivalents at December 31, 2022 consists solely of cash of $21.2 million, which is classified as Level 1 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, 2023. 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, 2023.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Taxes [Abstract]
Income Taxes	19. Income Taxes The income tax provision (benefit) consists of the following (in thousands): Year Ended December 31, 2023 2022 2021 Current: Domestic $ 15,422 $ 16,182 $ 26,528 Foreign 9,224 8,669 5,851 Total current 24,646 24,851 32,379 Deferred: Domestic (5,769 ) 1,102 (1,161 ) Foreign (509 ) (747 ) (174 ) Total deferred (6,278 ) 355 (1,335 ) Total income tax provision $ 18,368 $ 25,206 $ 31,044 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, 2023 2022 2021 U.S. Federal income tax rate of 21 $ 17,160 $ 20,650 $ 27,398 Increase (decrease) in tax rate resulting from: State and local income taxes, net of federal income tax benefit 2,086 3,118 4,579 Change in valuation allowance 674 1,068 466 Income tax (benefit) attributable to foreign income 377 (53 ) (122 ) Other non-deductible items, net (1,929 ) 423 (1,277 ) Provision for income taxes $ 18,368 $ 25,206 $ 31,044 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, 2023 2022 Deferred tax assets: Inventories $ 10,493 $ 11,604 Allowance for customer returns 13,083 14,506 Accrued asbestos liabilities 20,758 17,208 Accrued salaries and benefits 11,816 12,048 Tax credit and NOL carryforwards 5,968 5,103 Allowance for expected credit losses 3,567 2,965 Other 17 215 65,702 63,649 Valuation allowance (3,830 ) (3,155 ) Total deferred tax assets 61,872 60,494 Deferred tax liabilities: Intangible assets acquired, net of amortization 12,668 13,292 Depreciation 7,597 8,715 Interest rate swap agreement 990 1,299 Other 84 3,530 Total deferred tax liabilities 21,339 26,836 Net deferred tax assets $ 40,533 $ 33,658 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 $3.8 million as of December 31, 2023 is intended to provide for uncertainty regarding the ultimate realization of our U.S. foreign tax credit carryovers. 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 $40.5 million as of December 31, 2023, which is net of the remaining valuation allowance. At December 31, 2023, we have foreign tax credit carryforwards of approximately $3.8 million that will expire in varying amounts by 2032 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, or all, of these earnings indefinitely outside of the U.S., and do not expect to incur any significant additional taxes related to such amounts. In accordance with generally accepted accounting practices, 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, 2023, 2022 and 2021, we did t 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, 2023, the Company is no longer subject to U.S. Federal tax examinations for years before 2020. We remain subject to examination by state and local tax authorities for tax years 2019 through 2022 2019 2018 2021 2019 2018 2018 2017 2019

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings Per Share	20. 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 per share data): Year Ended December 31, 2023 2022 2021 Net Earnings Attributable to SMP - Earnings from continuing operations $ 63,144 $ 73,042 $ 99,353 Loss from discontinued operations (28,996 ) (17,691 ) (8,467 ) Net earnings attributable to SMP $ 34,148 $ 55,351 $ 90,886 Basic Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 2.91 $ 3.37 $ 4.49 Loss from discontinued operations per common share (1.34 ) (0.82 ) (0.39 ) Net earnings per common share attributable to SMP $ 1.57 $ 2.55 $ 4.10 Weighted average common shares outstanding 21,716 21,684 22,147 2023 2022 2021 Diluted Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 2.85 $ 3.30 $ 4.39 Loss from discontinued operations per common share (1.31 ) (0.80 ) (0.37 ) Net earnings per common share attributable to SMP $ 1.54 $ 2.50 $ 4.02 Weighted average common shares outstanding 21,716 21,684 22,147 Plus incremental shares from assumed conversions: Dilutive effect of restricted stock and performance-based stock 445 456 469 Weighted average common shares outstanding – Diluted 22,161 22,140 22,616 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): 2023 2022 2021 Restricted and performance shares 280 292 269

Industry Segment and Geographic

Industry Segment and Geographic Data	12 Months Ended
	Dec. 31, 2023
Industry Segment and Geographic Data [Abstract]
Industry Segment and Geographic Data	21. Industry Segment and Geographic Data Beginning on January 1, 2023, we reorganized our business into three operating segments – Vehicle Control, Temperature Control and Engineered Solutions Vehicle Control Temperature Control Engineered Solutions The accounting policies of each segment are the same as those described in the summary of significant accounting policies (see Note 1). The following tables contain financial information for each reportable operating segment (in thousands): Year Ended December 31, 2023 2022 2021 Net sales (a): Vehicle Control $ 737,932 $ 750,571 $ 737,431 Temperature Control 337,754 351,237 324,080 Engineered Solutions 282,586 270,007 237,305 Other — — — Total net sales $ 1,358,272 $ 1,371,815 $ 1,298,816 Depreciation and Amortization: Vehicle Control $ 13,877 $ 14,075 $ 14,840 Temperature Control 3,424 2,973 3,345 Engineered Solutions 9,966 9,557 7,390 Other 1,755 1,693 1,668 Total depreciation and amortization $ 29,022 $ 28,298 $ 27,243 Operating income (loss) Vehicle Control $ 71,327 $ 74,153 $ 97,029 Temperature Control 17,343 26,459 30,077 Engineered Solutions 19,944 18,713 19,982 Other (15,937 ) (15,190 ) (18,089 ) Total operating income $ 92,677 $ 104,135 $ 128,999 Investment in unconsolidated affiliates: Vehicle Control $ 2,496 $ 2,490 $ 2,729 Temperature Control 19,711 27,557 28,518 Engineered Solutions 1,843 11,698 12,840 Other — — — Total investment in unconsolidated affiliates $ 24,050 $ 41,745 $ 44,087 Capital expenditures Vehicle Control $ 13,955 $ 13,378 $ 17,048 Temperature Control 1,899 3,973 2,130 Engineered Solutions 12,095 6,489 5,354 Other 684 2,116 1,343 Total capital expenditures $ 28,633 $ 25,956 $ 25,875 Total assets Vehicle Control $ 620,569 $ 618,789 $ 604,016 Temperature Control 274,657 254,137 234,771 Engineered Solutions 292,080 289,518 272,791 Other 105,741 92,485 86,383 Total assets $ 1,293,047 $ 1,254,929 $ 1,197,961 (a) There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments. Other consists of financial information related to the activities of our corporate headquarters function. Reconciliation of segment operating income to net earnings: Year Ended December 31, 2023 2022 2021 (In thousands) Operating income $ 92,677 $ 104,135 $ 128,999 Other non-operating income, net 2,326 4,814 3,494 Interest expense 13,287 10,617 2,028 Earnings from continuing operations before income taxes 81,716 98,332 130,465 Provision for income taxes 18,368 25,206 31,044 Earnings from continuing operations 63,348 73,126 99,421 Discontinued operations, net of tax (28,996 ) (17,691 ) (8,467 ) Net earnings $ 34,352 $ 55,435 $ 90,954 December 31, 2023 2022 2021 Long-lived assets (a) (In thousands) United States $ 368,792 $ 326,199 $ 315,983 Asia 75,869 76,766 80,175 Europe 44,517 38,351 37,892 Mexico 13,262 10,355 12,119 Canada 5,851 7,161 4,461 Total long-lived assets $ 508,291 $ 458,832 $ 450,630 (a) Long-lived assets are attributed to countries based upon the location of the assets. Our three largest individual customers accounted for approximately 59% of our consolidated net sales in 2023. 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, 2023
Net Sales [Abstract]
Net Sales	22. Net Sales Disaggregation of Net Sales We disaggregate our net sales from contracts with customers by major product group and geographic area within each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our net sales are affected by economic factors. Major Product Group The Vehicle Control operating segment generates its revenues from core aftermarket sales of ignition, emissions, and fuel delivery, electrical and safety, and wire sets and other product categories. The Temperature Control The following table summarizes consolidated net sales by major product group within each operating segment for the years ended December 31, 2023, 2022 and 2021 (in thousands): Year Ended December 31, 2023 2022 2021 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 450,180 $ 454,571 $ 444,196 Electrical and Safety 221,782 230,487 224,520 Wire Sets and Other 65,970 65,513 68,715 Total Vehicle Control 737,932 750,571 737,431 Temperature Control AC System Components 237,756 245,484 231,466 Other Thermal Components 99,998 105,753 92,614 Total Temperature Control 337,754 351,237 324,080 Engineered Solutions Commercial Vehicle 83,025 80,275 76,066 Construction/Agriculture 43,402 42,385 33,220 Light Vehicle 92,759 91,533 86,440 All Other 63,400 55,814 41,579 Total Engineered Solutions 282,586 270,007 237,305 Other — — — Total $ 1,358,272 $ 1,371,815 $ 1,298,816 Geographic Area We sell our line of products primarily in the United States, with additional sales in Canada, Mexico, Europe, Asia and Latin America. Sales are attributed to countries based upon the location of the customer. Our sales are substantially denominated in U.S. dollars. The following tables provide disaggregation of net sales information by geographic area within each operating segment for the years ended December 31, 2023, 2022 and 2021 (in thousands): Year Ended December 31, 2023 Vehicle Control Temperature Control Engineered Solutions Other Total Geographic Area: 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 Other Total Geographic Area: 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 Year Ended December 31, 2021 Vehicle Control Temperature Control Engineered Solutions Other Total Geographic Area: United States $ 677,684 $ 309,247 $ 147,447 $ — $ 1,134,378 Canada 35,063 13,585 13,912 — 62,560 Europe 771 153 26,759 — 27,683 Mexico 19,741 358 5,547 — 25,646 Asia 144 101 40,771 — 41,016 Other foreign 4,028 636 2,869 — 7,533 Total $ 737,431 $ 324,080 $ 237,305 $ — $ 1,298,816

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies [Abstract]
Commitments and Contingencies	23. Commitments and Contingencies Total rent expense for the three years ended December 31, 2023 was as follows (in thousands): Total (1) Real Estate Other 2023 $ 19,706 $ 15,735 $ 3,971 2022 14,135 11,385 2,750 2021 12,065 9,500 2,565 (1) In cludes expenses of approximately $3.3 million , $ million, and $2 million for the years ended December 31, 2023, 2022 and 2021, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is no For our operating lease minimal rental payments that we are obligated to make, see Note 7, “Leases.” 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. As of December 31, 2023 and 2022, we have accrued $21.1 million and $19.7 million, respectively, for estimated product warranty claims included in accrued customer returns. The accrued product warranty costs are based primarily on historical experience of actual warranty claims. Warranty expense for each of the years 2023, 2022, and 2021 were The following table provides the changes in our product warranties: December 31, 2023 2022 (In thousands) Balance, beginning of period $ 19,667 $ 17,463 Liabilities accrued for current year sales 120,027 112,477 Settlements of warranty claims (118,560 ) (110,273 ) Balance, end of period $ 21,134 $ 19,667 Letters of Credit As of December 31, 2023 and 2022, we had outstanding letters of credit with certain vendors aggregating approximately $2.3 million and $2.4 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 I n 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, 2023, approximately Since inception in September 2001 through December 31, 2023, the amounts paid for settled claims and awards of asbestos-related damages, including interest, were approximately In evaluating our potential asbestos-related liability, we have considered various factors including, among other things, an actuarial study of the asbestos related liabilities performed by an independent actuarial firm, our settlement amounts and whether there are any co-defendants, the jurisdiction in which lawsuits are filed, and the status and results of such claims. As is our accounting policy, we consider the advice of actuarial consultants with experience in assessing asbestos-related liabilities to estimate our potential claim liability; and perform an actuarial evaluation in the third quarter of each year and whenever events or changes in circumstances indicate that additional provisions may be necessary. The methodology used to project asbestos-related liabilities and costs in our actuarial study considered: (1) historical data available from publicly available studies; (2) an analysis of our recent claims history to estimate likely filing rates into the future; (3) an analysis of our currently pending claims; (4) an analysis of our settlements and awards of asbestos-related damages to date; and (5) an analysis of closed claims with pay ratios and lag patterns in order to develop average future settlement values. Based on the information contained in the actuarial study and all other available information considered by us, we have concluded that no amount within the range of settlement payments and awards of asbestos-related damages was more likely than any other and, therefore, in assessing our asbestos liability we compare the low end of the range to our recorded liability to determine if an adjustment is required. In accordance with our policy to perform an annual actuarial evaluation in the quarter of each year, an actuarial study was performed as of . T $84 to $ for the period through . Based upon the results of the actuarial study, in we increased our asbestos liability to $ , the low end of the range, and recorded an incremental pre-tax provision of $ in earnings (loss) from discontinued operations in the accompanying statement of operations. Future legal costs, which are expensed as incurred and reported in earnings (loss) from discontinued operations in the accompanying statement of operations, are estimated, according to the August 31, 2023 study, to range from $ to $105.2 for the period through . Total operating cash outflows related to discontinued operations, which include settlements, awards of asbestos-related damages and legal costs, net of taxes, were $11 , $ and $ for the years ended and , 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 May 2023, we were found liable for approximately $11 million and, as such, in the second quarter of 2023 we recorded a pre-tax provision of such amount in earnings (loss) from discontinued operations in the accompanying statement of operations. However, in August 2023, we reached a final settlement of the legal proceeding, in which we reduced our liability to $10.5 million. In connection therewith, we reduced the pre-tax provision to $10.5 million and recorded a $0.5 million credit in earnings (loss) from discontinued operations in the accompanying statement of operations. Payment of such claim was made in early October 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 . We may at any time determine that settling any of these matters is in our best interests, which settlement may include substantial payments.

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Insider Trading Arrangements [Line Items]
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

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2023
Schedule II - Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	STANDARD MOTOR PRODUCTS, INC. AND SUBSIDIARIES Schedule II ‑ Years ended December 31, 2023, 2022 and 2021 Additions Description Balance at beginning of year Charged to costs and expenses Other Deductions Balance at end of year 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 (1) $ — $ 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 Year ended December 31, 2021 : Allowance for expected credit losses $ 4,406,000 $ 450,000 $ — $ 41,000 $ 4,815,000 Allowance for discounts 1,416,000 13,827,000 — 13,888,000 1,355,000 $ 5,822,000 $ 14,277,000 $ — $ 13,929,000 $ 6,170,000 Allowance for sales returns $ 40,982,000 $ 129,964,000 $ — $ 128,534,000 $ 42,412,000 (1) Includes a $7 million charge relating to one of our customers that filed a petition for bankruptcy in January 2023.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation 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 two segments, Vehicle Control and Temperature Control, while our Engineered Solutions segment offers a broad array of conventional and future-oriented technologies in markets for commercial and light vehicles, construction, agriculture, power sports, marine, hydraulics and lawn and garden. We sell our products primarily to retailers, warehouse distributors, original equipment manufacturers and original equipment service part operations in the United States, Canada, Europe, Asia, Mexico and other Latin American countries The consolidated financial statements include our accounts and all domestic and international companies in which we have more than a 50% equity ownership, except in instances where the minority shareholder maintains substantive participating rights, in which case we follow the equity method of accounting. In instances where we have more than a 50% equity ownership and the minority shareholder does not maintain substantive participating rights, our consolidated financial statements include the accounts of the company on a consolidated basis with its net income and equity reported at amounts attributable to both our equity position and that of the noncontrolling interest. Investments in unconsolidated affiliates are accounted for on the equity method, as we do not have a controlling financial interest but have the ability to exercise significant influence. All significant inter-company items have been eliminated
Use of Estimates	Use of Estimates T he 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
Reclassification	Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2023 presentation.
Reportable Segments	Reportable Segments Beginning on January 1, 2023, we reorganized our business into three operating segments – Vehicle Control, Temperature Control and Engineered Solutions. The new operating segment structure better 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. Prior period segment results have been reclassified to conform to our operating segment reorganization. For additional information related to our segment reorganization, see Note 8, “Goodwill and Acquired Intangible Assets,” Note 21, “Industry Segment and Geographic Data” and Note 22, “Net Sales.”
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 $42.9 million and $42.5 million as of December 31, 2023 and 2022, 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 as unreturned customer inventory 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 Building improvements 10 to 25 years Machinery and equipment 5 to years Tools, dies and auxiliary equipment 3 to years Furniture and fixtures 3 to 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.
Valuation of Long-Lived and Intangible Assets and Goodwill	Valuation of Long-Lived and Intangible Assets and Goodwill At acquisition, we estimate and record the fair value of purchased intangible assets, which primarily consist of customer relationships, trademarks and trade names, patents, developed technology and intellectual property, and non-compete agreements. 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. As related to valuing customer relationships, significant estimates and assumptions used include but are not limited to: (1) forecasted revenues attributable to existing customers; (2) forecasted earnings before interest and taxes (“EBIT”) margins; (3) customer attrition rates; and (4) the discount rate. Goodwill is the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. 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. We assess the impairment of long‑lived assets, identifiable intangibles assets and goodwill 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 goodwill quantitative impairment test. In performing the quantitative 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 remains there until the underlying foreign operation is liquidated or substantially disposed of. Foreign currency transaction gains or losses are recorded in the statement of operations under the caption “other non-operating income (expense), net.”
Revenue Recognition	Revenue Recognition We derive our revenue primarily from vehicle aftermarket sales in our Vehicle Control and Temperature Control 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 providing 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 must be made and used 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 -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 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 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 must be made and used 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.
Deferred Financing Costs	Deferred Financing Costs Deferred financing costs represent costs incurred in conjunction with our debt financing activities. Deferred financing costs related to our term loan and revolving credit facilities are capitalized and amortized over the life of the related financing arrangement. If the debt is retired early, the related unamortized deferred financing costs are written off in the period the debt is retired and are recorded in the statement of operations under the caption other non-operating income (expense), net.
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. The valuation allowance of as of December 31, 2023 is intended to provide for the uncertainty regarding the ultimate realization of our U.S. foreign tax credit carryovers. Based on these considerations, we believe it is more likely than not that we will realize the benefit of the net deferred tax asset of as of December 31, 2023 which is net of the remaining valuation allowance. 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. During the years ended December 31, 2023, 2022 and 2021 we did not establish a liability for uncertain tax positions.
Environmental Reserves	Environmental Reserves We are subject to various U.S. Federal and state and local environmental laws and regulations and are involved in certain environmental remediation efforts. We estimate and accrue our liabilities resulting from such matters based upon a variety of factors including the assessments of environmental engineers and consultants who provide estimates of potential liabilities and remediation costs. Such estimates are not discounted to reflect the time value of money due to the uncertainty in estimating the timing of the expenditures, which may extend over several years. Potential recoveries from insurers or other third parties of environmental remediation liabilities are recognized independently from the recorded liability, and any asset related to the recovery will be recognized only when the realization of the claim for recovery is deemed probable.
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: (1) historical data available from publicly available studies; (2) an analysis of our recent claims history to estimate likely filing rates into the future; (3) an analysis of our currently pending claims; (4) an analysis of our settlements and awards of asbestos-related damages to date; and (5) an analysis of closed claims with pay ratios and lag patterns in order to develop average future settlement values. Based on the information contained in the actuarial study and all other available information considered by us, we have concluded that no amount within the range of settlement payments and awards of asbestos-related damages was more likely than any other and, therefore, in assessing our asbestos liability we compare the low end of the range to our recorded liability to determine if an adjustment is required. 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
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. In January 2023, one of our customers filed a petition for bankruptcy. In connection with the bankruptcy filing, we evaluated our potential risk and exposure as related to our outstanding accounts receivable balance from the customer as of December 31, 2022, and estimated our anticipated recovery. As a result of our evaluation, we recorded a $7 million pre-tax charge during the year ended December 31, 2022 to reduce our accounts receivable balance to our estimated recovery. The $7 million pre-tax charge was included in selling, general and administrative expenses in our consolidated statement of operation s. The bankruptcy court proceedings have continued into 2023. Although the courts have named us a “critical supplier,” the funds allocated to us have not yet been determined and, as such, we have not recorded an adjustment to the $7 million pre-tax charge previously recorded. 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	Foreign Cash Balances Substantially all of the cash and cash equivalents, including foreign cash balances, at December 31, 2023 and 2022 were uninsured. Foreign cash balances at December 31, 2023 and 2022 were and , 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 interest rate hedges (“interest rate swap agreements”), 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). 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 Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Standards that are not yet adopted as of December 31, 2023 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required income effective tax rate reconciliation disclosures to include disclosure of (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, the ASU 2023-09 will expand required 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. The new standard will require expanding our interim and annual income tax disclosures in our financial statements. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of March 31, 2025. We have reviewed all other recently issued accounting pronouncements and concluded they were either not applicable or not expected to have a material impact on the Company’s consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies [Abstract]
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 Building improvements 10 to 25 years Machinery and equipment 5 to years Tools, dies and auxiliary equipment 3 to years Furniture and fixtures 3 to years

Business Acquisitions and Inv_2

Business Acquisitions and Investments (Tables)	12 Months Ended
	Dec. 31, 2023
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member]
Business Acquisition [Line Items]
Allocation of Purchase Price, Assets Acquired And Liabilities Assumed	The following table summarizes the allocation of the total step acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (1) $ 21,725 Assets acquired and liabilities assumed: Cash and cash equivalents $ 6,779 Receivables 5,912 Inventory 5,945 Other current assets 528 Property, plant and equipment, net 2,924 Operating lease right-of-use assets 4,372 Intangible assets (2) 532 Goodwill 2,208 Long term investments and other assets 7,257 Current liabilities (6,004 ) Noncurrent operating lease liabilities (3,455 ) Subtotal 26,998 Fair value of acquired noncontrolling interest (5,273 ) Total purchase consideration allocated to net assets acquired $ 21,725 (1) Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest. (2) Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million.
Kade [Member]
Business Acquisition [Line Items]
Allocation of Purchase Price, Assets Acquired And Liabilities Assumed	The following table presents the allocation of the purchase price to the assets acquired and liabilities assumed based on their fair values (in thousands): Purchase price $ 3,176 Assets acquired and liabilities assumed: Receivables $ 790 Inventory 829 Other current assets (1) 1,003 Property, plant and equipment, net 63 Operating lease right-of-use assets 401 Intangible assets 2,395 Goodwill 766 Current liabilities (1,977 ) Noncurrent operating lease liabilities (328 ) Deferred income taxes (766 ) Net assets acquired $ 3,176 (1) The other current assets balance includes $1 million of cash acquired.

Restructuring and Integration_2

Restructuring and Integration Expenses (Tables)	12 Months Ended
	Dec. 31, 2023
Restructuring and Integration Expenses [Abstract]
Restructuring and Integration Expense	The aggregated liabilities included in “sundry payables and accrued expenses” and “other accrued liabilities” in the consolidated balance sheet relating to the restructuring and integration activities as of and for the years ended December 31, 2023 and 2022, consisted of the following (in thousands): Workforce Reduction Other Exit Costs Total Exit activity liability at December 31 2021 $ 79 $ — $ 79 Restructuring and integration costs: Amounts provided for during 2022 (1) 1,521 370 1,891 Cash payments (16 ) (144 ) (160 ) Reclassification of environmental and other liabilities (63 ) (226 ) (289 ) Exit activity liability at December 31 2022 $ 1,521 $ — $ 1,521 Restructuring and integration costs: Amounts provided for during 2023 (1) (2) 1,973 669 2,642 Cash payments (1,803 ) (577 ) (2,380 ) Reclassification of environmental liability — (92 ) (92 ) Foreign currency exchange rate changes 38 — 38 Exit activity liability at December 31 2023 $ 1,729 $ — $ 1,729 (1) Included in restructuring and integration costs in 2023 and 2022 is a $0.1 million and $0.2 million increase, respectively, in environmental cleanup costs related to ongoing monitoring and remediation in connection with the prior closure of our manufacturing operations at our Long Island City, New York location. The environmental liability has been reclassed to accrued liabilities as of December 31, 2023 and 2022, respectively. (2) Restructuring and integration expenses incurred during the year ended December 31, 2023 consist of $1.3 million in our Vehicle Control segment, $1.1 million in our Temperature Control segment and $0.2 million in our Engineered Solutions segment.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2023
Inventories [Abstract]
Inventories	December 31, 2023 2022 (In thousands) Finished goods $ 302,557 $ 324,362 Work-in-process 18,503 14,099 Raw materials 186,015 190,254 Subtotal 507,075 528,715 Unreturned customer inventories 18,240 19,695 Total inventories $ 525,315 $ 548,410

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	December 31, 2023 2022 (In thousands) Land, buildings and improvements $ 45,710 $ 42,651 Machinery and equipment 177,337 166,149 Tools, dies and auxiliary equipment 73,494 67,017 Furniture and fixtures 33,212 32,084 Leasehold improvements 16,418 15,083 Construction-in-progress 35,357 23,340 Total property, plant and equipment 381,528 346,324 Less accumulated depreciation 259,656 239,176 Total property, plant and equipment, net $ 121,872 $ 107,148

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Quantitative Disclosures Related to Operating Leases	The following tables provide quantitative disclosures related to our operating leases and includes all operating leases acquired from the date of the acquisition : Balance Sheet Information December 31, Assets 2023 2022 Operating lease right-of-use assets $ 100,065 $ 49,838 Liabilities Sundry payables and accrued expenses $ 17,139 $ 10,763 Noncurrent operating lease liabilities 88,974 40,709 Total operating lease liabilities $ 106,113 $ 51,472 Weighted Average Remaining Lease Term Operating leases 8.3 Years 7 Years Weighted Average Discount Rate Operating leases 4.8 % 3.7 % Year Ended, December 31, Expense and Cash Flow Information 2023 2022 Lease Expense Operating lease expense (a) $ 16,434 $ 11,411 Supplemental Cash Flow Information Cash Paid for the amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 12,099 $ 11,293 Right-of-use assets obtained in exchange for new lease obligations: Operating leases (b) $ 66,014 $ 31,064 (a) Excludes expenses of approximately $3.3 million, $2.7 million and $2 million for the years ended December 31, 2023, 2022, and 2021, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material. (b) During the year ended December 31, 2023 includes $27.8 million of right-of-use assets related to the lease modification and extension for our distribution center and office in Lewisville, Texas; $26.1 million of right-of-use assets related to the new distribution center in Shawnee, Kansas; $4.4 million of right-of-use assets obtained in Gwo Yng step-acquisition; and $3.7 million of right-of-use assets related to our Reynosa, Mexico lease renewal.
Minimum Lease Payments	At December 31, 2023, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows (in thousands): 2024 $ 17,607 2025 16,145 2026 14,814 2027 13,671 2028 11,415 Thereafter 58,059 Total lease payments $ 131,711 Less: Interest (25,598 ) Present value of lease liabilities $ 106,113

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Other Intangible Assets [Abstract]
Carrying Value of Goodwill by Operating Segment	Changes in the carrying values of goodwill by operating segment during the years ended December 31, 2023 and 2022 are as follows (in thousands): Vehicle Control Temperature Control Engineered Solutions Total Balance as of December 31 2021 Goodwill $ 129,318 $ 10,839 $ 29,983 $ 170,140 Accumulated impairment losses (38,488 ) — — (38,488 ) $ 90,830 $ 10,839 $ 29,983 $ 131,652 Activity in 2022 Acquisition of Kade — 582 184 766 Foreign currency exchange rate change (310 ) 53 (74 ) (331 ) 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 exchange rate change 286 42 106 434 Balance as of December 31 Goodwill 129,294 12,730 31,193 173,217 Accumulated impairment losses (38,488 ) — — (38,488 ) $ 90,806 $ 12,730 $ 31,193 $ 134,729
Acquired Identifiable Intangible Assets	Acquired identifiable intangible assets as of December 31, 2023 and 2022 consist of: December 31, 2023 2022 (In thousands) Customer relationships $ 159,641 $ 158,717 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 8,880 8,880 Non-compete agreements 3,295 3,282 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets 186,899 185,962 Less accumulated amortization (1) (95,681 ) (86,945 ) Net acquired intangible assets $ 91,218 $ 99,017 (3) Applies to all intangible assets, except for a related trademark/trade name totaling $2.6 million, which has an indefinite useful life and, as such, is not being amortized.

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	12 Months Ended
	Dec. 31, 2023
Investments in Unconsolidated Affiliates [Abstract]
Investments in Unconsolidated Affiliates	December 31, 2023 2022 (In thousands) Foshan FGD SMP Automotive Compressor Co. Ltd $ 18,426 $ 16,747 Foshan Che Yijia New Energy Technology Co., Ltd. 3,128 4,098 Orange Electronic Co. Ltd 2,496 2,490 Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. — 18,410 Total $ 24,050 $ 41,745

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Other Assets [Abstract]
Other Assets	December 31, 2023 2022 (In thousands) Deferred compensation $ 23,893 $ 20,190 Long-term investments 7,468 — Noncurrent portion of interest rate swap fair value 1,944 3,091 Deferred financing costs, net 1,125 1,603 Other 837 2,626 Total other assets, net $ 35,267 $ 27,510

Credit Facilities and Long-Te_2

Credit Facilities and Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Credit Facilities and Long-Term Debt [Abstract]
Summary of Total Debt Outstanding	Total debt outstanding is summarized as follows: December 31, 2023 2022 (In thousands) Credit facility – term loan due 2027 $ 92,500 $ 97,500 Credit facility – revolver due 2027 63,500 142,000 Other 211 120 Total debt $ 156,211 $ 239,620 Current maturities of debt $ 5,029 $ 55,031 Long-term debt 151,182 184,589 Total debt $ 156,211 $ 239,620
Maturities of Debt	As of December 31, 2023, maturities of debt through 2027, assuming no prepayments, are as follows (in thousands): Revolving Credit Facility Term Loan Facility Polish Overdraft Facility and Other Debt Total 2024 $ — $ 5,000 $ 29 $ 5,029 2025 — 5,000 31 5,031 2026 — 7,500 49 7,549 2027 63,500 75,000 102 138,602 Total $ 63,500 $ 92,500 $ 211 $ 156,211 Less: current maturities — (5,000 ) (29 ) (5,029 ) Long-term debt $ 63,500 $ 87,500 $ 182 $ 151,182

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income by Component	Changes in Accumulated Other Comprehensive Income by Component (in thousands) Foreign Currency Translation Unrecognized Postretirement Benefit Costs (Credit) Unrealized derivative gains (losses) Total Balance at December 31, 2021 attributable to SMP $ (8,221 ) $ 52 $ — $ (8,169 ) Other comprehensive income before reclassifications (8,109 ) — 3,797 (1) (4,312 ) Amounts reclassified from accumulated other comprehensive income — (15 ) 26 11 Other comprehensive income, net (8,109 ) (15 ) 3,823 (4,301 ) Balance at December 31, 2022 attributable to SMP $ (16,330 ) $ 37 $ 3,823 $ (12,470 ) Other comprehensive income before reclassifications 7,433 — 831 (1) 8,264 Amounts reclassified from accumulated other comprehensive income — (13 ) (1,755 ) (1,768 ) Other comprehensive income, net 7,433 (13 ) (924 ) 6,496 Balance at December 31, 2023 attributable to SMP $ (8,897 ) $ 24 $ 2,899 $ (5,974 ) (1) Consists of 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; and the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $5.2 million ($3.8 million, net of tax) minus cash settlement payments of $42,000 ($31,000, net of tax) in the year December 31, 2022.
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications Out of Accumulated Other Comprehensive Income (in thousands): Year Ended December 31, Details About Accumulated Other Comprehensive Income Components 2023 2022 Derivative cash flow hedge: Unrecognized gain (loss) (1) $ (2,372 ) $ 35 Postretirement Benefit Plans: Unrecognized gain (loss) (2) (22 ) (25 ) Total before income tax (2,394 ) 10 Income tax expense (benefit) (626 ) (1 ) Total reclassifications attributable to SMP $ (1,768 ) $ 11 (1) 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. (2) Unrecognized accumulated other comprehensive income (loss) related to our post retirement plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income (expense), net in our consolidated statements of operations (see Note 15, “Employee Benefits,” for additional information).

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Stock-Based Compensation Plans [Abstract]
Restricted and Performance-Based Share Activity	Our restricted and performance-based share activity was as follows for the years ended December 31, 2023 and 2022: Shares Weighted Average Grant Date Fair Value per Share Balance at December 31 2021 807,019 $ 34.92 Granted 246,325 28.44 Vested (190,082 ) 41.71 Performance Shares Target Adjustment 25,317 42.21 Forfeited (7,750 ) 40.73 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

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2023
Employee Benefits [Abstract]
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, 2023 $ 10,510 2022 10,180 2021 9,763

Other Non-Operating Income (E_2

Other Non-Operating Income (Expense), Net (Tables)	12 Months Ended
	Dec. 31, 2023
Other Non-Operating Income (Expense), Net [Abstract]
Components of Other Non-Operating Income (Expense)	The components of other non-operating income (expense), net are as follows: Year Ended December 31, 2023 2022 2021 (In thousands) Interest and dividend income $ 517 $ 209 $ 49 Equity income from joint ventures 2,070 3,464 3,295 Gain (loss) on foreign exchange (776 ) 334 (257 ) Other non-operating income, net 515 807 407 Total other non-operating income, net $ 2,326 $ 4,814 $ 3,494

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Measurements [Abstract]
Summary of Estimated Fair Values, Carrying Amounts and Classification under Fair Value Hierarchy	The following is a summary of the estimated fair values, carrying amounts, and classification under the fair value hierarchy of our financial instruments at December 31, 2023 and December 31, 2022 (in thousands): December 31, 2023 December 31, 2022 Fair Value Hierarchy Fair Value Carrying Amount Fair Value Carrying Amount Cash and cash equivalents (a) LEVEL 1/2 $ 32,526 $ 32,526 $ 21,150 $ 21,150 Deferred compensation LEVEL 1 23,893 23,893 20,190 20,190 Short term borrowings LEVEL 1 5,029 5,029 55,031 55,031 Long-term debt LEVEL 1 151,182 151,182 184,589 184,589 Cash flow interest rate swap LEVEL 2 3,939 3,939 5,174 5,174 Long-term investments LEVEL 2 7,468 7,468 — — (a) As of December 31, 2023 cash and cash equivalents 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 and cash equivalents at December 31, 2022 consists solely of cash of $21.2 million, which is classified as Level 1 under the fair value hierarchy.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Taxes [Abstract]
Income Tax Provision (Benefit)	The income tax provision (benefit) consists of the following (in thousands): Year Ended December 31, 2023 2022 2021 Current: Domestic $ 15,422 $ 16,182 $ 26,528 Foreign 9,224 8,669 5,851 Total current 24,646 24,851 32,379 Deferred: Domestic (5,769 ) 1,102 (1,161 ) Foreign (509 ) (747 ) (174 ) Total deferred (6,278 ) 355 (1,335 ) Total income tax provision $ 18,368 $ 25,206 $ 31,044
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, 2023 2022 2021 U.S. Federal income tax rate of 21 $ 17,160 $ 20,650 $ 27,398 Increase (decrease) in tax rate resulting from: State and local income taxes, net of federal income tax benefit 2,086 3,118 4,579 Change in valuation allowance 674 1,068 466 Income tax (benefit) attributable to foreign income 377 (53 ) (122 ) Other non-deductible items, net (1,929 ) 423 (1,277 ) Provision for income taxes $ 18,368 $ 25,206 $ 31,044
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, 2023 2022 Deferred tax assets: Inventories $ 10,493 $ 11,604 Allowance for customer returns 13,083 14,506 Accrued asbestos liabilities 20,758 17,208 Accrued salaries and benefits 11,816 12,048 Tax credit and NOL carryforwards 5,968 5,103 Allowance for expected credit losses 3,567 2,965 Other 17 215 65,702 63,649 Valuation allowance (3,830 ) (3,155 ) Total deferred tax assets 61,872 60,494 Deferred tax liabilities: Intangible assets acquired, net of amortization 12,668 13,292 Depreciation 7,597 8,715 Interest rate swap agreement 990 1,299 Other 84 3,530 Total deferred tax liabilities 21,339 26,836 Net deferred tax assets $ 40,533 $ 33,658

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Reconciliations of Earnings Available to Common Stockholders and Shares used in Calculating Basic and Dilutive Net Earnings per Common Share	The following are reconciliations of the net earnings attributable to SMP and the shares used in calculating basic and dilutive net earnings per common share attributable to SMP (in thousands, except per share data): Year Ended December 31, 2023 2022 2021 Net Earnings Attributable to SMP - Earnings from continuing operations $ 63,144 $ 73,042 $ 99,353 Loss from discontinued operations (28,996 ) (17,691 ) (8,467 ) Net earnings attributable to SMP $ 34,148 $ 55,351 $ 90,886 Basic Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 2.91 $ 3.37 $ 4.49 Loss from discontinued operations per common share (1.34 ) (0.82 ) (0.39 ) Net earnings per common share attributable to SMP $ 1.57 $ 2.55 $ 4.10 Weighted average common shares outstanding 21,716 21,684 22,147 2023 2022 2021 Diluted Net Earnings Per Common Share Attributable to SMP - Earnings from continuing operations per common share $ 2.85 $ 3.30 $ 4.39 Loss from discontinued operations per common share (1.31 ) (0.80 ) (0.37 ) Net earnings per common share attributable to SMP $ 1.54 $ 2.50 $ 4.02 Weighted average common shares outstanding 21,716 21,684 22,147 Plus incremental shares from assumed conversions: Dilutive effect of restricted stock and performance-based stock 445 456 469 Weighted average common shares outstanding – Diluted 22,161 22,140 22,616
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): 2023 2022 2021 Restricted and performance shares 280 292 269

Industry Segment and Geograph_2

Industry Segment and Geographic Data (Tables)	12 Months Ended
	Dec. 31, 2023
Industry Segment and Geographic Data [Abstract]
Sales and Operating Income by Operating Segments	The accounting policies of each segment are the same as those described in the summary of significant accounting policies (see Note 1). The following tables contain financial information for each reportable operating segment (in thousands): Year Ended December 31, 2023 2022 2021 Net sales (a): Vehicle Control $ 737,932 $ 750,571 $ 737,431 Temperature Control 337,754 351,237 324,080 Engineered Solutions 282,586 270,007 237,305 Other — — — Total net sales $ 1,358,272 $ 1,371,815 $ 1,298,816 Depreciation and Amortization: Vehicle Control $ 13,877 $ 14,075 $ 14,840 Temperature Control 3,424 2,973 3,345 Engineered Solutions 9,966 9,557 7,390 Other 1,755 1,693 1,668 Total depreciation and amortization $ 29,022 $ 28,298 $ 27,243 Operating income (loss) Vehicle Control $ 71,327 $ 74,153 $ 97,029 Temperature Control 17,343 26,459 30,077 Engineered Solutions 19,944 18,713 19,982 Other (15,937 ) (15,190 ) (18,089 ) Total operating income $ 92,677 $ 104,135 $ 128,999 Investment in unconsolidated affiliates: Vehicle Control $ 2,496 $ 2,490 $ 2,729 Temperature Control 19,711 27,557 28,518 Engineered Solutions 1,843 11,698 12,840 Other — — — Total investment in unconsolidated affiliates $ 24,050 $ 41,745 $ 44,087 Capital expenditures Vehicle Control $ 13,955 $ 13,378 $ 17,048 Temperature Control 1,899 3,973 2,130 Engineered Solutions 12,095 6,489 5,354 Other 684 2,116 1,343 Total capital expenditures $ 28,633 $ 25,956 $ 25,875 Total assets Vehicle Control $ 620,569 $ 618,789 $ 604,016 Temperature Control 274,657 254,137 234,771 Engineered Solutions 292,080 289,518 272,791 Other 105,741 92,485 86,383 Total assets $ 1,293,047 $ 1,254,929 $ 1,197,961 (a) There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.
Reconciliation of Segment Operating Income to Net Earnings	Reconciliation of segment operating income to net earnings: Year Ended December 31, 2023 2022 2021 (In thousands) Operating income $ 92,677 $ 104,135 $ 128,999 Other non-operating income, net 2,326 4,814 3,494 Interest expense 13,287 10,617 2,028 Earnings from continuing operations before income taxes 81,716 98,332 130,465 Provision for income taxes 18,368 25,206 31,044 Earnings from continuing operations 63,348 73,126 99,421 Discontinued operations, net of tax (28,996 ) (17,691 ) (8,467 ) Net earnings $ 34,352 $ 55,435 $ 90,954
Long-lived Assets by Geographical Areas	December 31, 2023 2022 2021 Long-lived assets (a) (In thousands) United States $ 368,792 $ 326,199 $ 315,983 Asia 75,869 76,766 80,175 Europe 44,517 38,351 37,892 Mexico 13,262 10,355 12,119 Canada 5,851 7,161 4,461 Total long-lived assets $ 508,291 $ 458,832 $ 450,630 (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, 2023
Net Sales [Abstract]
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, 2023, 2022 and 2021 (in thousands): Year Ended December 31, 2023 2022 2021 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 450,180 $ 454,571 $ 444,196 Electrical and Safety 221,782 230,487 224,520 Wire Sets and Other 65,970 65,513 68,715 Total Vehicle Control 737,932 750,571 737,431 Temperature Control AC System Components 237,756 245,484 231,466 Other Thermal Components 99,998 105,753 92,614 Total Temperature Control 337,754 351,237 324,080 Engineered Solutions Commercial Vehicle 83,025 80,275 76,066 Construction/Agriculture 43,402 42,385 33,220 Light Vehicle 92,759 91,533 86,440 All Other 63,400 55,814 41,579 Total Engineered Solutions 282,586 270,007 237,305 Other — — — Total $ 1,358,272 $ 1,371,815 $ 1,298,816 Geographic Area We sell our line of products primarily in the United States, with additional sales in Canada, Mexico, Europe, Asia and Latin America. Sales are attributed to countries based upon the location of the customer. Our sales are substantially denominated in U.S. dollars. The following tables provide disaggregation of net sales information by geographic area within each operating segment for the years ended December 31, 2023, 2022 and 2021 (in thousands): Year Ended December 31, 2023 Vehicle Control Temperature Control Engineered Solutions Other Total Geographic Area: 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 Other Total Geographic Area: 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 Year Ended December 31, 2021 Vehicle Control Temperature Control Engineered Solutions Other Total Geographic Area: United States $ 677,684 $ 309,247 $ 147,447 $ — $ 1,134,378 Canada 35,063 13,585 13,912 — 62,560 Europe 771 153 26,759 — 27,683 Mexico 19,741 358 5,547 — 25,646 Asia 144 101 40,771 — 41,016 Other foreign 4,028 636 2,869 — 7,533 Total $ 737,431 $ 324,080 $ 237,305 $ — $ 1,298,816

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies [Abstract]
Rent Expense	Total rent expense for the three years ended December 31, 2023 was as follows (in thousands): Total (1) Real Estate Other 2023 $ 19,706 $ 15,735 $ 3,971 2022 14,135 11,385 2,750 2021 12,065 9,500 2,565 (1) In cludes expenses of approximately $3.3 million , $ million, and $2 million for the years ended December 31, 2023, 2022 and 2021, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is no
Changes in Product Warranties	The following table provides the changes in our product warranties: December 31, 2023 2022 (In thousands) Balance, beginning of period $ 19,667 $ 17,463 Liabilities accrued for current year sales 120,027 112,477 Settlements of warranty claims (118,560 ) (110,273 ) Balance, end of period $ 21,134 $ 19,667

Summary of Significant Accoun_4

Summary of Significant Accounting Policies, Principles of Consolidation (Details)	12 Months Ended
	Dec. 31, 2023 Segment
Principles of Consolidation [Abstract]
Number of reportable segments	2
Equity ownership in entities included in consolidated financial statements, minimum	50%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies, Reportable Segments (Details)	12 Months Ended
	Dec. 31, 2023 Segment
Reportable Segments [Abstract]
Number of operating segments	3

Summary of Significant Accoun_6

Summary of Significant Accounting Policies, Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory [Abstract]
Inventory reserve	$ 42.9	$ 42.5

Summary of Significant Accoun_7

Summary of Significant Accounting Policies, Property, Plant and Equipment (Details)	Dec. 31, 2023
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	25 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	33 years 6 months
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	10 years
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	25 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	5 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	12 years
Tools, Dies and Auxiliary Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	3 years
Tools, Dies and Auxiliary Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	8 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	12 years

Summary of Significant Accoun_8

Summary of Significant Accounting Policies, Product Warranty and Overstock Returns and Accounting for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Product Warranty and Overstock Returns [Abstract]
Product warranty period	90 days
Accounting for Income Taxes [Abstract]
Valuation allowance	$ 3,830	$ 3,155
Net deferred tax asset	$ 40,533	$ 33,658

Summary of Significant Accoun_9

Summary of Significant Accounting Policies, Concentrations of Credit Risk and Foreign Cash Balances (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($)
Concentration Risk [Abstract]
Number of customers who filed a petition | Customer	1	1
Customer bankruptcy charge	$ 0	$ 7,002	$ 0
Foreign Cash Balances [Abstract]
Foreign cash balance	$ 30,500	18,500
Customer Concentration Risk [Member]
Concentration Risk [Abstract]
Number of largest individual customers | Customer	3
Selling, General and Administrative Expenses [Member]
Concentration Risk [Abstract]
Customer bankruptcy charge		$ 7,000

Business Acquisitions and Inv_3

Business Acquisitions and Investments, Investment in Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (Details) $ in Thousands			6 Months Ended	12 Months Ended
		Jul. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 31, 2023 CNY (¥)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Apr. 30, 2014 USD ($)
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates				$ 24,050	$ 41,745	$ 44,087
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill				134,729	132,087	131,652
Cash paid for the acquisition of equity interest				$ 3,954	$ 1,934	$ 125,419
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Percentage of equity interest acquired		15%		80%	65%		15%	15%	15%	50%
Investments in unconsolidated affiliates		$ 4,000		$ 0	$ 18,410		¥ 27,378,290	$ 4,200	¥ 26,475,583	$ 14,000
Total purchase consideration	[1]	21,725
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents		6,779
Receivables		5,912
Inventory		5,945
Other current assets		528
Property, plant, and equipment, net		2,924
Operating lease right-of-use assets		4,372		$ 4,400
Intangible assets	[2]	532
Goodwill		2,208
Long term investments and other assets		7,257
Current liabilities		(6,004)
Noncurrent operating lease liabilities		(3,455)
Subtotal		26,998
Fair value of acquired noncontrolling interest		(5,273)
Net assets acquired		21,725
Equity investment interest held			$ 17,700
Cash paid for the acquisition of equity interest		4,000
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member] | Temperature Control Segment [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill		1,200
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member] | Engineered Solutions Segment [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill		$ 1,000
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member] | Customer Relationships [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Estimated useful life of intangible assets		10 days					10 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets		$ 400
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member] | Capitalized Software [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets		$ 100
[1]Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest.[2]Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million.

Business Acquisitions and Inv_4

Business Acquisitions and Investments, Investment in Foshan Che Yijia New Energy Technology Co., Ltd (Details) ¥ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2022 CNY (¥)	Sep. 30, 2022	Dec. 31, 2021 USD ($)	Aug. 31, 2019 USD ($)
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	$ 24,050,000	$ 41,745,000				$ 44,087,000
Foshan Che Yijia New Energy Technology Co., Ltd. [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Percentage of equity interest acquired	33%		3.55%	3.55%	29%		29%
Investments in unconsolidated affiliates	$ 3,128,000	$ 4,098,000	$ 242,000	¥ 1.7			$ 5,100,000
Foshan Che Yijia New Energy Technology Co., Ltd. [Member] | Minimum [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Percentage of equity interest acquired			29%	29%
Foshan Che Yijia New Energy Technology Co., Ltd. [Member] | Maximum [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Percentage of equity interest acquired			33%	33%

Business Acquisitions and Inv_5

Business Acquisitions and Investments, Acquisition of Capital Stock of Kade Trading GmbH (Details) $ in Thousands, € in Millions		1 Months Ended		12 Months Ended
		Oct. 31, 2022 USD ($)	Oct. 31, 2022 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2022 EUR (€)
Allocation of the Purchase Price, Assets Acquired and Liabilities Assumed [Abstract]
Business acquisition annual sales	[1]			$ 1,358,272	$ 1,371,815	$ 1,298,816
Assets acquired and liabilities assumed [Abstract]
Goodwill				134,729	132,087	131,652
Cash acquired				6,779	$ 0	$ 0
Kade [Member]
Business Combination, Description [Abstract]
Percentage of entity acquired		100%					100%
Allocation of the Purchase Price, Assets Acquired and Liabilities Assumed [Abstract]
Payment to acquire business		$ 2,700	€ 2.7
Earn-out based performance obligation in 2024 and 2025		500					€ 0.5
Business acquisition annual sales		6,000
Assets acquired and liabilities assumed [Abstract]
Purchase Price		3,176
Receivables		790
Inventory		829
Other current assets	[2]	1,003
Property, plant, and equipment, net		63
Operating lease right-of-use assets		401
Intangible assets		2,395
Goodwill		766
Current liabilities		(1,977)
Noncurrent operating lease liabilities		(328)
Deferred income taxes		(766)
Net assets acquired		3,176
Cash acquired		$ 1,000
Revenues from acquisition date				$ 5,000
Kade [Member] | Customer Relationships [Member]
Assets acquired and liabilities assumed [Abstract]
Estimated useful life of intangible assets				15 years
[1]There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.[2]The other current assets balance includes $1 million of cash acquired.

Restructuring and Integration_3

Restructuring and Integration Expenses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		$ 1,521		$ 79
Restructuring and integration costs provided for during period		2,642	[1],[2]	1,891	[1]	$ 392
Cash payments		(2,380)		(160)
Reclassification of environmental and other liabilities		(92)		(289)
Foreign currency exchange rate changes		38
Exit activity liability, end of period		1,729		1,521		79
Reclassification of environment liability		100		200
Vehicle Control Segment [Member]
Restructuring and integration activities [Roll Forward]
Restructuring and integration costs provided for during period		1,300
Temperature Control Segment [Member]
Restructuring and integration activities [Roll Forward]
Restructuring and integration costs provided for during period		1,100
Engineered Solutions Segment [Member]
Restructuring and integration activities [Roll Forward]
Restructuring and integration costs provided for during period		200
Soot Sensor Product Line Relocation [Member]
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		0
Cash payments				(144)
Exit activity liability, end of period				0
Plant Rationalization Programs [Member]
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		0
Cash payments		(16)
Exit activity liability, end of period				0
Cost Reduction Initiative [Member]
Restructuring and integration activities [Roll Forward]
Restructuring and integration costs provided for during period		2,500		1,500
Cash payments		(2,400)
Restructuring Costs [Abstract]
Sales force reduction costs		700		900
Employee severance costs		1,300		600
Expenses related to relocation of machinery and equipment		500
Additional restructuring costs		500
Workforce Reduction [Member]
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		1,521		79
Restructuring and integration costs provided for during period	[1]	1,973	[2]	1,521
Cash payments		(1,803)		(16)
Reclassification of environmental and other liabilities		0		(63)
Foreign currency exchange rate changes		38
Exit activity liability, end of period		1,729		1,521		79
Other Exit Costs [Member]
Restructuring and integration activities [Roll Forward]
Exit activity liability, beginning of period		0		0
Restructuring and integration costs provided for during period	[1]	669	[2]	370
Cash payments		(577)		(144)
Reclassification of environmental and other liabilities		(92)		(226)
Foreign currency exchange rate changes		0
Exit activity liability, end of period		$ 0		$ 0		$ 0
[1]Included in restructuring and integration costs in 2023 and 2022 is a $0.1 million and $0.2 million increase, respectively, in environmental cleanup costs related to ongoing monitoring and remediation in connection with the prior closure of our manufacturing operations at our Long Island City, New York location.  The environmental liability has been reclassed to accrued liabilities as of December 31, 2023 and 2022, respectively.[2]Restructuring and integration expenses incurred during the year ended December 31, 2023 consist of $1.3 million in our Vehicle Control segment, $1.1 million in our Temperature Control segment and $0.2 million in our Engineered Solutions segment.

Sale of Receivables (Details)

Sale of Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 830.8	$ 813.7
Receivables not yet collected	4.5	0
Charge related to sale of receivables	$ 46	$ 32	$ 11.5

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventories [Abstract]
Finished goods	$ 302,557	$ 324,362
Work-in-process	18,503	14,099
Raw materials	186,015	190,254
Subtotal	507,075	528,715
Unreturned customer inventories	18,240	19,695
Total inventories	$ 525,315	$ 548,410

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 381,528	$ 346,324
Less accumulated depreciation	259,656	239,176
Total property, plant and equipment, net	121,872	107,148
Depreciation expense	19,700	19,000	$ 18,200
Land, Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	45,710	42,651
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	177,337	166,149
Tools, Dies and Auxiliary Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	73,494	67,017
Furniture and Fixtures [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	33,212	32,084
Leasehold Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	16,418	15,083
Construction-in-Progress [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 35,357	$ 23,340

Leases (Details)

Leases (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2023
Quantitative Lease Disclosures [Abstract]
Renewal option period		5 years
Assets [Abstract]
Operating lease right-of-use assets		$ 100,065	$ 49,838
Liabilities [Abstract]
Sundry payables and accrued expenses		17,139	10,763
Noncurrent operating lease liabilities		88,974	40,709
Total operating lease liabilities		$ 106,113	$ 51,472
Operating Leases [Abstract]
Weighted average remaining lease term		8 years 3 months 18 days	7 years
Weighted average discount rate		4.80%	3.70%
Lease Expense [Abstract]
Operating lease expense	[1]	$ 16,434	$ 11,411
Excluded non-lease expenses		3,300	2,700	$ 2,000
Cash paid for the amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases		12,099	11,293
Right-of-use assets obtained in exchange for new lease obligations [Abstract]
Operating leases	[2]	66,014	31,064
Minimum Lease Payments [Abstract]
2024		17,607
2025		16,145
2026		14,814
2027		13,671
2028		11,415
Thereafter		58,059
Total lease payments		131,711
Less: Interest		(25,598)
Total operating lease liabilities		$ 106,113	$ 51,472
Maximum [Member]
Quantitative Lease Disclosures [Abstract]
Remaining operating lease terms		11 years
Texas [Member]
Right-of-use assets obtained in exchange for new lease obligations [Abstract]
Right-of-use assets related to lease modifications and extension		$ 27,800
Kansas [Member]
Right-of-use assets obtained in exchange for new lease obligations [Abstract]
Right-of-use assets related to lease modifications and extension		26,100
Mexico [Member]
Right-of-use assets obtained in exchange for new lease obligations [Abstract]
Right-of-use assets related to lease modifications and extension		3,700
Gwo Yng [Member]
Right-of-use assets obtained in exchange for new lease obligations [Abstract]
Right-of use assets obtained in business acquisitions		$ 4,400			$ 4,372
[1] Excludes expenses of approximately $3.3 million, $2.7 million and $2 million for the years ended December 31, 2023, 2022, and 2021, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material. During the year ended December 31, 2023 includes $27.8 million of right-of-use assets related to the lease modification and extension for our distribution center and office in Lewisville, Texas; $26.1 million of right-of-use assets related to the new distribution center in Shawnee, Kansas; $4.4 million of right-of-use assets obtained in Gwo Yng step-acquisition; and $3.7 million of right-of-use assets related to our Reynosa, Mexico lease renewal.

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill by operating segment [Abstract]
Goodwill impairment charge	$ 0
Goodwill gross, beginning balance	170,575	$ 170,140
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	132,087	131,652
Goodwill foreign currency exchange rate change	434	(331)
Goodwill gross, ending balance	173,217	170,575
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	134,729	132,087
Kade Trading GmbH [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition		766
Gwo Yng [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	2,208
Vehicle Control [Member]
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	129,008	129,318
Goodwill accumulated impairment losses, Beginning balance	(38,488)	(38,488)
Goodwill net, beginning balance	90,520	90,830
Goodwill foreign currency exchange rate change	286	(310)
Goodwill gross, ending balance	129,294	129,008
Goodwill accumulated impairment losses, Ending balance	(38,488)	(38,488)
Goodwill net, ending balance	90,806	90,520
Vehicle Control [Member] | Kade Trading GmbH [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition		0
Vehicle Control [Member] | Gwo Yng [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	0
Temperature Control [Member]
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	11,474	10,839
Goodwill accumulated impairment losses, Beginning balance	0	0
Goodwill net, beginning balance	11,474	10,839
Goodwill foreign currency exchange rate change	42	53
Goodwill gross, ending balance	12,730	11,474
Goodwill accumulated impairment losses, Ending balance	0	0
Goodwill net, ending balance	12,730	11,474
Temperature Control [Member] | Kade Trading GmbH [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition		582
Temperature Control [Member] | Gwo Yng [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	1,214
Engineered Solutions [Member]
Goodwill by operating segment [Abstract]
Goodwill gross, beginning balance	30,093	29,983
Goodwill accumulated impairment losses, Beginning balance	0	0
Goodwill net, beginning balance	30,093	29,983
Goodwill foreign currency exchange rate change	106	(74)
Goodwill gross, ending balance	31,193	30,093
Goodwill accumulated impairment losses, Ending balance	0	0
Goodwill net, ending balance	31,193	30,093
Engineered Solutions [Member] | Kade Trading GmbH [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition		$ 184
Engineered Solutions [Member] | Gwo Yng [Member]
Goodwill by operating segment [Abstract]
Goodwill acquisition	$ 994

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		$ 186,899	$ 185,962
Less accumulated amortization	[1]	(95,681)	(86,945)
Net acquired intangible assets		91,218	99,017
Amortization of acquired intangible assets [Abstract]
Amortization expense		8,500	8,600	$ 8,700
Estimated amortization expense in year 2024		8,500
Estimated amortization expense in year 2025		8,500
Estimated amortization expense in years 2026 through 2041		8,500
Estimated amortization expense in years 2027 through 2041		8,400
Estimated amortization expense in years 2028 through 2041		54,700
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		159,641	158,717
Patents, Developed Technology and Intellectual Property [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		14,123	14,123
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		8,880	8,880
Intangible assets acquired [Abstract]
Amount of acquired indefinite-lived intangible assets		2,600
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		3,295	3,282
Supply Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		800	800
Leaseholds [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total acquired intangible assets		160	160
Computer Software [Member]
Other Intangible Assets [Abstract]
Other intangible assets		19,100	18,700
Accumulated computer software amortization		(18,000)	(17,200)
Amortization of computer software		$ 800	$ 700	$ 300
Computer Software [Member] | Minimum [Member]
Other Intangible Assets [Abstract]
Estimated useful life of intangible assets		3 years
Computer Software [Member] | Maximum [Member]
Other Intangible Assets [Abstract]
Estimated useful life of intangible assets		10 years
[1]Applies to all intangible assets, except for a related trademark/trade name totaling $2.6 million, which has an indefinite useful life and, as such, is not being amortized.

Investments in Unconsolidated_3

Investments in Unconsolidated Affiliates (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Oct. 31, 2022 USD ($)	Oct. 31, 2022 CNY (¥)	Sep. 30, 2022	Dec. 31, 2021 USD ($)	Aug. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Nov. 30, 2017 USD ($)	Apr. 30, 2014 USD ($)	Jan. 31, 2013 USD ($)
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	$ 24,050,000	$ 41,745,000						$ 44,087,000
Outstanding borrowings	156,211,000	239,620,000
Foshan FGD SMP Automotive Compressor Co. Ltd [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	18,426,000	16,747,000										$ 12,500,000
Percentage of equity interest acquired												50%
Purchases from equity method investment	44,100,000	43,500,000
Foshan Che Yijia New Energy Technology Co., Ltd. [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	$ 3,128,000	4,098,000			$ 242,000	¥ 1,700,000			$ 5,100,000
Percentage of equity interest acquired	33%				3.55%	3.55%	29%		29%
Maximum borrowing capacity								$ 4,000,000
Interest rate								5%
Maturity date	Nov. 30, 2023
Outstanding borrowings	$ 4,000,000
Orange Electronic Co., Ltd [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	2,496,000	$ 2,490,000												$ 6,300,000
Percentage of equity interest acquired		19.40%
Purchases from equity method investment	3,200,000	$ 4,500,000
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member]
Investments in and Advances to Affiliates, Balance [Abstract]
Investments in unconsolidated affiliates	$ 0	$ 18,410,000	$ 4,000,000	¥ 27,378,290						$ 4,200,000	¥ 26,475,583		$ 14,000,000
Percentage of equity interest acquired	80%	65%	15%	15%						15%	15%		50%
Purchases from equity method investment	$ 10,300,000	$ 16,200,000

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Assets [Abstract]
Deferred compensation	$ 23,893	$ 20,190
Long-term investments	7,468	0
Noncurrent portion of interest rate swap fair value	1,944	3,091
Deferred financing costs, net	1,125	1,603
Other	837	2,626
Total other assets, net	$ 35,267	$ 27,510

Credit Facilities and Long-Te_3

Credit Facilities and Long-Term Debt, Total Debt Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instruments [Abstract]
Total debt	$ 156,211	$ 239,620
Current maturities of debt	5,029	55,031
Long-term debt	151,182	184,589
Credit Facility - Term Loan Due 2027 [Member]
Debt Instruments [Abstract]
Total debt	92,500	97,500
Current maturities of debt	5,000
Long-term debt	87,500
Credit Facility - Revolver Due 2027 [Member]
Debt Instruments [Abstract]
Total debt	63,500	142,000
Current maturities of debt	0
Long-term debt	63,500
Other [Member]
Debt Instruments [Abstract]
Total debt	211	$ 120
Current maturities of debt	29
Long-term debt	$ 182

Credit Facilities and Long-Te_4

Credit Facilities and Long-Term Debt, Term Loan and Revolving Credit Facilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Installment	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Line of Credit Facility [Abstract]
Current portion of debt	$ 0	$ 50,000
Senior Secured Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Outstanding borrowings under credit facility		239,500
Outstanding letters of credit		$ 2,400
Weighted average interest rate		5.20%
Senior Secured Revolving Credit Facility [Member] | SOFR [Member]
Line of Credit Facility [Abstract]
Weighted average interest rate		5.20%
Senior Secured Revolving Credit Facility [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Abstract]
Average daily loan balance outstanding		$ 5,600
Term Loan and Revolving Credit Facilities [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity			$ 500,000
Maturity date	Jun. 01, 2027
Frequency of periodic payment	quarterly
Debt instrument, extension period	1 year
Borrowing base	$ 168,000
Maximum consolidated EBITDA	1
Net Leverage Ratio	250%
Outstanding borrowings under credit facility	$ 156,000
Current portion of debt	5,000	55,000
Long-term debt	151,000	184,500
Outstanding letters of credit	$ 2,300
Weighted average interest rate	5%
Term Loan and Revolving Credit Facilities [Member] | SOFR [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	0.10%
Term of variable rate	1 month
Interest rate periods	one, three or nine months
Outstanding borrowings under credit facility	$ 156,000	237,000
Weighted average interest rate	5%
Term Loan and Revolving Credit Facilities [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	0.50%
Term Loan and Revolving Credit Facilities [Member] | Term Benchmark Borrowings [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	1%
Term Loan and Revolving Credit Facilities [Member] | Term Benchmark Borrowings [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	2%
Term Loan and Revolving Credit Facilities [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	1%
Outstanding borrowings under credit facility	$ 2,500
Weighted average interest rate	8%
Average daily loan balance outstanding	$ 100
Term Loan and Revolving Credit Facilities [Member] | Alternate Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	0%
Term Loan and Revolving Credit Facilities [Member] | Alternate Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate	1%
Term Loan Facility [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity			100,000
Term Loan Facility [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Number of extensions of maturity date | Installment	2
Term Loan Facility [Member] | First Four Years [Member]
Line of Credit Facility [Abstract]
Periodic payment amortization percentage	1.25%
Term Loan Facility [Member] | Fifth Year [Member]
Line of Credit Facility [Abstract]
Periodic payment amortization percentage	2.50%
Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity			400,000
Letter of Credit Sublimit [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity	$ 25,000
Swing Line Loans [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity	25,000
Interest Rate Swap Agreement [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity	$ 100,000
Term of variable rate	1 month
Period of agreement	7 years
Outstanding borrowings under credit facility	$ 100,000	$ 100,000	$ 100,000

Credit Facilities and Long-Te_5

Credit Facilities and Long-Term Debt, Polish Overdraft Facility (Details) - Polish Overdraft Facility [Member] zł in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2022 PLN (zł)
Line of Credit Facility [Abstract]
Maximum borrowing capacity			$ 7.6	zł 30
Threshold percentage of borrowing capacity	85%
Threshold borrowing capacity limit	$ 6.5
Overdraft facility renewal period	3 months
Overdraft facility cancellation period	30 days
Overdraft facility	$ 0	$ 0
1M WIBOR [Member]
Line of Credit Facility [Abstract]
Basis spread on variable rate	1%
1M EURIBOR [Member]
Line of Credit Facility [Abstract]
Basis spread on variable rate	1%
Mid-Point of Fed Target Range [Member]
Line of Credit Facility [Abstract]
Basis spread on variable rate	1.25%

Credit Facilities and Long-Te_6

Credit Facilities and Long-Term Debt, Maturities of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Maturities of Debt [Abstract]
2024	$ 5,029
2025	5,031
2026	7,549
2027	138,602
Total debt	156,211	$ 239,620
Less: current maturities	(5,029)	(55,031)
Long-term debt	151,182	184,589
Revolving Credit Facility [Member]
Maturities of Debt [Abstract]
2024	0
2025	0
2026	0
2027	63,500
Total debt	63,500	142,000
Less: current maturities	0
Long-term debt	63,500
Term Loan Facility [Member]
Maturities of Debt [Abstract]
2024	5,000
2025	5,000
2026	7,500
2027	75,000
Total debt	92,500	97,500
Less: current maturities	(5,000)
Long-term debt	87,500
Polish Overdraft Facility and Other Debt [Member]
Maturities of Debt [Abstract]
2024	29
2025	31
2026	49
2027	102
Total debt	211	$ 120
Less: current maturities	(29)
Long-term debt	$ 182

Credit Facilities and Long-Te_7

Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Financing Costs [Abstract]
Deferred financing costs	$ 1.6	$ 2.1
Deferred Finance Costs, Amortization [Abstract]
2024	0.5
2025	0.5
2026	0.5
2027	$ 0.1

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP		$ 610,020
Other comprehensive income before reclassifications		8,264	$ (4,312)
Amounts reclassified from accumulated other comprehensive income		(1,768)	11
Other comprehensive income, net		6,496	(4,301)
Balance attributable to SMP		635,064	610,020
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Unrecognized gain relating to change in fair value of cash flow interest rate hedge		1,200	5,200
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax		900	3,800
Unrecognized gain, net of cash settlements		2,400	42
Unrecognized gain, net of cash settlements, net of tax		1,700	31
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP		(12,470)	(8,169)
Balance attributable to SMP		(5,974)	(12,470)
Foreign Currency Translation [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP		(16,330)	(8,221)
Other comprehensive income before reclassifications		7,433	(8,109)
Amounts reclassified from accumulated other comprehensive income		0	0
Other comprehensive income, net		7,433	(8,109)
Balance attributable to SMP		(8,897)	(16,330)
Unrecognized Postretirement Benefit Costs (Credit) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP		37	52
Other comprehensive income before reclassifications		0	0
Amounts reclassified from accumulated other comprehensive income		(13)	(15)
Other comprehensive income, net		(13)	(15)
Balance attributable to SMP		24	37
Unrealized Derivative Gains (Losses) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP		3,823	0
Other comprehensive income before reclassifications	[1]	831	3,797
Amounts reclassified from accumulated other comprehensive income		(1,755)	26
Other comprehensive income, net		(924)	3,823
Balance attributable to SMP		$ 2,899	$ 3,823
[1] Consists of 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; and the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $5.2 million ($3.8 million, net of tax) minus cash settlement payments of $42,000 ($31,000, net of tax) in the year December 31, 2022.

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income, Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Details About Accumulated Other Comprehensive Income Components [Abstract]
Interest expense		$ 13,287	$ 10,617	$ 2,028
Other non-operating income, net		2,326	4,814	3,494
Earnings from continuing operations before taxes		81,716	98,332	130,465
Income tax expense (benefit)		18,368	25,206	31,044
Net earnings attributable to SMP	[1]	34,148	55,351	$ 90,886
Reclassification out of Accumulated Other Comprehensive Income [Member]
Details About Accumulated Other Comprehensive Income Components [Abstract]
Earnings from continuing operations before taxes		(2,394)	10
Income tax expense (benefit)		(626)	(1)
Net earnings attributable to SMP		(1,768)	11
Unrealized Derivative Gains (Losses) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details About Accumulated Other Comprehensive Income Components [Abstract]
Interest expense	[2]	(2,372)	35
Unrecognized Postretirement Benefit Costs (Credit) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details About Accumulated Other Comprehensive Income Components [Abstract]
Other non-operating income, net	[3]	$ (22)	$ (25)
[1]Throughout this Form 10-K, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.[2] 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. Unrecognized accumulated other comprehensive income (loss) related to our post retirement plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income (expense), net in our consolidated statements of operations (see Note 15, “Employee Benefits,” for additional information).

Stockholders' Equity (Details)

Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2022 shares	Dec. 31, 2023 USD ($) Vote $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Jul. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Feb. 28, 2021 USD ($)	Mar. 31, 2020 USD ($)
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchased during period			$ 29,656	$ 26,862
Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, shares authorized (in shares) | shares		500,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 20
Preferred stock, shares outstanding (in shares) | shares	0	0	0
Series A Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, shares authorized (in shares) | shares		30,000
Number of votes per share | Vote		1,000
Stock Repurchase Program 2020 [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, authorized amount								$ 20,000
Stock repurchased during period (in shares) | shares				150,273
Stock repurchased during period				$ 6,500
Stock Repurchase Program 2021, February [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, authorized amount							$ 20,000
Stock repurchased during period (in shares) | shares			464,992
Stock repurchased during period			$ 20,000
Stock Repurchase Program 2021, October [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, authorized amount						$ 30,000
Stock repurchased during period (in shares) | shares		692,067	7,000
Stock repurchased during period		$ 29,700	$ 300
Stock Repurchase Program 2022, July [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, authorized amount					$ 30,000
Stock repurchased during period (in shares) | shares	0

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Type $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Restricted Stock and Performance Share Grants [Abstract]
Number of types of restricted stock | Type	2
Compensation expense, gross | $	$ 6,598	$ 8,178	$ 9,479
Restricted Shares [Member] | Minimum [Member]
Restricted Stock and Performance Share Grants [Abstract]
Expiration of vesting period	3 years
Restricted Shares [Member] | Employees [Member]
Restricted Stock and Performance Share Grants [Abstract]
Estimated forfeitures	5%
Restricted Shares [Member] | Executives [Member]
Restricted Stock and Performance Share Grants [Abstract]
Estimated forfeitures	0%
Restricted Shares [Member] | Directors [Member]
Restricted Stock and Performance Share Grants [Abstract]
Estimated forfeitures	0%
Restricted Shares [Member] | Age 60 [Member] | Executives [Member]
Restricted Stock and Performance Share Grants [Abstract]
Vesting percentage	25%
Vesting period before reaching age limit	2 months
Restricted Shares [Member] | Age 63 [Member] | Executives [Member]
Restricted Stock and Performance Share Grants [Abstract]
Vesting percentage	25%
Vesting period before reaching age limit	2 months
Restricted Shares [Member] | Age 65 [Member] | Executives [Member]
Restricted Stock and Performance Share Grants [Abstract]
Vesting percentage	100%
Vesting period before reaching age limit	2 months
Performance-Based Shares [Member]
Restricted Stock and Performance Share Grants [Abstract]
Measuring period for performance-based shares	3 years
Performance-Based Shares [Member] | Minimum [Member]
Restricted Stock and Performance Share Grants [Abstract]
Expiration of vesting period	3 years
Restricted and Performance-Based Shares [Member]
Restricted Stock and Performance Share Grants [Abstract]
Compensation expense, gross | $	$ 6,200	7,600	9,100
Compensation expense, net of tax | $	4,800	5,700	$ 6,900
Unamortized compensation expense | $	$ 13,300	$ 14,900
Restricted and performance-based stock, shares [Roll Forward]
Beginning of period (in shares)	880,829	807,019
Granted (in shares)	230,875	246,325
Vested (in shares)	(248,065)	(190,082)
Performance Shares Target Adjustment (in shares)	29,137	25,317
Forfeited (in shares)	(11,800)	(7,750)
End of period (in shares)	880,976	880,829	807,019
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]
Beginning of period (in dollars per share) | $ / shares	$ 31.79	$ 34.92
Granted (in dollars per share) | $ / shares	27	28.44
Vested (in dollars per share) | $ / shares	36.3	41.71
Performance Shares Target Adjustment (in dollars per share) | $ / shares	36.3	42.21
Forfeited (in dollars per share) | $ / shares	35.36	40.73
End of period (in dollars per share) | $ / shares	$ 29.48	$ 31.79	$ 34.92
Weighted-average grant date fair value | $	$ 26,000	$ 28,000	$ 28,200
Restricted and Performance-Based Shares [Member] | Employees [Member]
Restricted Stock and Performance Share Grants [Abstract]
Weighted average period of recognition for unrecognized compensation expense	4 years 1 month 6 days	4 years 3 months 18 days
Restricted and Performance-Based Shares [Member] | Directors [Member]
Restricted Stock and Performance Share Grants [Abstract]
Weighted average period of recognition for unrecognized compensation expense	3 months 18 days	3 months 18 days
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member]
Restricted Stock and Performance Share Grants [Abstract]
Holding period for restricted and performance shares issued	1 year
Post vesting holding period for restricted and performance shares issued	1 year
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member]
Restricted Stock and Performance Share Grants [Abstract]
Holding period for restricted and performance shares issued	2 years
Post vesting holding period for restricted and performance shares issued	2 years
2016 Omnibus Incentive Plan [Member] | Restricted Shares [Member]
Restricted and performance-based stock, shares [Roll Forward]
Granted (in shares)	165,125
2016 Omnibus Incentive Plan [Member] | Performance-Based Shares [Member]
Restricted and performance-based stock, shares [Roll Forward]
Granted (in shares)	65,750
2016 Omnibus Incentive Plan [Member] | Restricted and Performance-Based Shares [Member]
Restricted Stock and Performance Share Grants [Abstract]
Restricted and performance-based stock grants issued, net of forfeitures (in shares)	1,633,549
Common stock available for future grants (in shares)	416,451
2016 Omnibus Incentive Plan [Member] | Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]
Shares authorized for issuance (in shares)	2,050,000
2016 Omnibus Incentive Plan [Member] | Nonemployee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]
Shares authorized for issuance (in shares)	350,000

Employee Benefits (Details)

Employee Benefits (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) Employee shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Contribution Plans [Abstract]
U.S defined contribution			$ 10,510	$ 10,180	$ 9,763
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]
Provision for expense in connection with ESOP			$ 3,000	2,300	2,500
Postretirement Medical Benefits [Abstract]
Number of former union employees covered by the plan | Employee			14
Supplemental Executive Retirement Plan [Member]
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]
Employer discretionary contribution amount	$ 800	$ 800	$ 600
Benefit obligation outstanding			0	0
Net periodic benefit cost			$ 0	$ 0	$ 0
Employee Stock Ownership Plan and Trust (ESOP) [Member]
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract]
Additional shares contributed to ESOP (in shares) | shares			72,800
Shares released from trust (in shares) | shares			72,800
Total remaining balance of shares in the ESOP (in shares) | shares			200

Other Non-Operating Income (E_3

Other Non-Operating Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Non-Operating Income (Expense), Net [Abstract]
Interest and dividend income	$ 517	$ 209	$ 49
Equity income from joint ventures	2,070	3,464	3,295
Gain (loss) on foreign exchange	(776)	334	(257)
Other non-operating income, net	515	807	407
Total other non-operating income, net	$ 2,326	$ 4,814	$ 3,494

Derivative Financial Instrume_2

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Notional Disclosures [Abstract]
Derivative fair value	$ 1,944	$ 3,091
Interest Rate Swap Agreement [Member]
Notional Disclosures [Abstract]
Derivative term of contract	7 years
Borrowings under credit agreement	$ 100,000	100,000	$ 100,000
Term of variable rate	1 month
Fixed interest rate	2.683%
Derivative, credit spread adjustment percentage	0.10%
Margin on variable rate	1.25%
Interest Rate Swap [Member]
Notional Disclosures [Abstract]
Derivative term of contract	7 years
Derivative, notional amount			$ 100,000
Derivative contract, maturity date	May 31, 2029
Derivative fair value	$ 3,900	$ 5,200

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
LEVEL 1 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash		$ 29,500	$ 21,200
LEVEL 2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash equivalents		3,000
Fair Value [Member] | LEVEL1/2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash and cash equivalents	[1]	32,526	21,150
Fair Value [Member] | LEVEL 1 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Deferred compensation		23,893	20,190
Short term borrowings		5,029	55,031
Long-term debt		151,182	184,589
Fair Value [Member] | LEVEL 2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash flow interest rate swap		3,939	5,174
Long-term investments		7,468	0
Carrying Amount [Member] | LEVEL1/2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash and cash equivalents	[1]	32,526	21,150
Carrying Amount [Member] | LEVEL 1 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Deferred compensation		23,893	20,190
Short term borrowings		5,029	55,031
Long-term debt		151,182	184,589
Carrying Amount [Member] | LEVEL 2 [Member]
Fair Value, Net Asset (Liability) [Abstract]
Cash flow interest rate swap		3,939	5,174
Long-term investments		$ 7,468	$ 0
[1]As of December 31, 2023 cash and cash equivalents 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 and cash equivalents at December 31, 2022 consists solely of cash of $21.2 million, which is classified as Level 1 under the fair value hierarchy.

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current [Abstract]
Domestic	$ 15,422	$ 16,182	$ 26,528
Foreign	9,224	8,669	5,851
Total current	24,646	24,851	32,379
Deferred [Abstract]
Domestic	(5,769)	1,102	(1,161)
Foreign	(509)	(747)	(174)
Total deferred	(6,278)	355	(1,335)
Provision for income taxes	18,368	25,206	31,044
Reconciliations Between Taxes at the U.S. Federal Income Tax Rate and Taxes at our Effective Income Tax Rate on Earnings [Abstract]
U.S. Federal income tax rate of 21%	17,160	20,650	27,398
Increase (decrease) in tax rate resulting from [Abstract]
State and local income taxes, net of federal income tax benefit	2,086	3,118	4,579
Change in valuation allowance	674	1,068	466
Income tax (benefit) attributable to foreign income	377	(53)	(122)
Other non-deductible items, net	(1,929)	423	(1,277)
Provision for income taxes	$ 18,368	$ 25,206	$ 31,044
U.S. Federal income tax rate	21%	21%	21%
Deferred tax assets [Abstract]
Inventories	$ 10,493	$ 11,604
Allowance for customer returns	13,083	14,506
Accrued asbestos liabilities	20,758	17,208
Accrued salaries and benefits	11,816	12,048
Tax credit and NOL carryforwards	5,968	5,103
Allowance for expected credit losses	3,567	2,965
Other	17	215
Deferred tax assets, gross	65,702	63,649
Valuation allowance	(3,830)	(3,155)
Total deferred tax assets	61,872	60,494
Deferred tax liabilities [Abstract]
Intangible assets acquired, net of amortization	12,668	13,292
Depreciation	7,597	8,715
Interest rate swap agreement	990	1,299
Other	84	3,530
Total deferred tax liabilities	21,339	26,836
Net deferred tax assets	40,533	33,658
Valuation allowance, remaining amount	3,800
Income Tax Contingency [Abstract]
Recognized uncertain tax positions	$ 0	$ 0	$ 0
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards, expiration date	Dec. 31, 2032
Tax credit carryforward	$ 3,800
Foreign Tax Authority [Member] | Minimum [Member]
Income Tax Contingency [Abstract]
Period for statutes of limitations	2 years
Foreign Tax Authority [Member] | Maximum [Member]
Income Tax Contingency [Abstract]
Period for statutes of limitations	6 years
State and Local [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2019 2020 2021 2022
Canada Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2019 2020 2021 2022
Hong Kong Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2018 2019 2020 2021 2022
State Administration of Taxation, China [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2021 2022
Mexican Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2019 2020 2021 2022
Poland Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2018 2019 2020 2021 2022
Hungary Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2018 2019 2020 2021 2022
U.K. Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2017 2018 2019 2020 2021 2022
Germany Tax Authority [Member]
Income Tax Contingency [Abstract]
Open Tax Years	2019 2020 2021 2022

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Earnings Attributable to SMP [Abstract]
Earnings from continuing operations		$ 63,144	$ 73,042	$ 99,353
Loss from discontinued operations		(28,996)	(17,691)	(8,467)
Net earnings attributable to SMP	[1]	$ 34,148	$ 55,351	$ 90,886
Basic Net Earnings Per Common Share Attributable to SMP [Abstract]
Earnings from continuing operations per common share (in dollars per share)		$ 2.91	$ 3.37	$ 4.49
Loss from discontinued operations per common share (in dollars per share)		(1.34)	(0.82)	(0.39)
Net earnings per common share - Basic (in dollars per share)		$ 1.57	$ 2.55	$ 4.1
Weighted average common shares outstanding (in shares)		21,716,177	21,683,719	22,147,479
Diluted Net Earnings Per Common Share Attributable to SMP [Abstract]
Earnings from continuing operations per common share (in dollars per share)		$ 2.85	$ 3.3	$ 4.39
Loss from discontinued operations per common share (in dollars per share)		(1.31)	(0.8)	(0.37)
Net earnings per common share - Diluted (in dollars per share)		$ 1.54	$ 2.5	$ 4.02
Weighted average common shares outstanding (in shares)		21,716,177	21,683,719	22,147,479
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance-based stock (in shares)		445,000	456,000	469,000
Weighted average common shares outstanding - Diluted (in shares)		22,161,341	22,139,981	22,616,456
Restricted and Performance-Based Shares [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		280,000	292,000	269,000
[1]Throughout this Form 10-K, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Industry Segment and Geograph_3

Industry Segment and Geographic Data, Reportable Segments (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Financial information for reportable segment [Abstract]
Number of operating segments | Segment		3
Net sales	[1]	$ 1,358,272	$ 1,371,815	$ 1,298,816
Depreciation and amortization		29,022	28,298	27,243
Operating income (loss)		92,677	104,135	128,999
Investment in unconsolidated affiliates		24,050	41,745	44,087
Capital expenditures		28,633	25,956	25,875
Total assets		1,293,047	1,254,929	1,197,961
Vehicle Control [Member] | Reportable Segments [Member]
Financial information for reportable segment [Abstract]
Net sales	[1]	737,932	750,571	737,431
Depreciation and amortization		13,877	14,075	14,840
Operating income (loss)		71,327	74,153	97,029
Investment in unconsolidated affiliates		2,496	2,490	2,729
Capital expenditures		13,955	13,378	17,048
Total assets		620,569	618,789	604,016
Temperature Control [Member] | Reportable Segments [Member]
Financial information for reportable segment [Abstract]
Net sales	[1]	337,754	351,237	324,080
Depreciation and amortization		3,424	2,973	3,345
Operating income (loss)		17,343	26,459	30,077
Investment in unconsolidated affiliates		19,711	27,557	28,518
Capital expenditures		1,899	3,973	2,130
Total assets		274,657	254,137	234,771
Engineered Solutions [Member] | Reportable Segments [Member]
Financial information for reportable segment [Abstract]
Net sales	[1]	282,586	270,007	237,305
Depreciation and amortization		9,966	9,557	7,390
Operating income (loss)		19,944	18,713	19,982
Investment in unconsolidated affiliates		1,843	11,698	12,840
Capital expenditures		12,095	6,489	5,354
Total assets		292,080	289,518	272,791
Other [Member]
Financial information for reportable segment [Abstract]
Net sales	[1]	0	0	0
Depreciation and amortization		1,755	1,693	1,668
Operating income (loss)		(15,937)	(15,190)	(18,089)
Investment in unconsolidated affiliates		0	0	0
Capital expenditures		684	2,116	1,343
Total assets		$ 105,741	$ 92,485	$ 86,383
[1]There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.

Industry Segment and Geograph_4

Industry Segment and Geographic Data, Operating Income to Earnings (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of segment operating income to net earnings [Abstract]
Operating Income		$ 92,677	$ 104,135	$ 128,999
Other non-operating income, net		2,326	4,814	3,494
Interest expense		13,287	10,617	2,028
Earnings from continuing operations before income taxes		81,716	98,332	130,465
Provision for income taxes		18,368	25,206	31,044
Earnings from continuing operations		63,348	73,126	99,421
Discontinued operations, net of tax		(28,996)	(17,691)	(8,467)
Net earnings		34,352	55,435	90,954
Long-lived assets [Abstract]
Long-lived assets	[1]	508,291	458,832	450,630
United States [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	368,792	326,199	315,983
Asia [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	75,869	76,766	80,175
Europe [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	44,517	38,351	37,892
Mexico [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	13,262	10,355	12,119
Canada [Member]
Long-lived assets [Abstract]
Long-lived assets	[1]	$ 5,851	$ 7,161	$ 4,461
[1]Long-lived assets are attributed to countries based upon the location of the assets.

Industry Segment and Geograph_5

Industry Segment and Geographic Data, Customer Concentration (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2023 Customer
Customer Concentration [Abstract]
Number of largest individual customers	3
Net Sales [Member] | Three Largest Individual Customers [Member]
Customer Concentration [Abstract]
Concentration risk, percentage	59%
Net Sales [Member] | O' Reilly Auto Parts [Member]
Customer Concentration [Abstract]
Concentration risk, percentage	29%
Net Sales [Member] | AutoZone [Member]
Customer Concentration [Abstract]
Concentration risk, percentage	16%
Net Sales [Member] | NAPA [Member]
Customer Concentration [Abstract]
Concentration risk, percentage	14%

Net Sales (Details)

Net Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 1,358,272	$ 1,371,815	$ 1,298,816
United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	1,148,352	1,209,104	1,134,378
Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	78,858	66,591	62,560
Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	60,190	38,520	27,683
Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	43,057	31,317	25,646
Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	20,399	19,186	41,016
Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	7,416	7,097	7,533
Vehicle Control [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	737,932	750,571	737,431
Vehicle Control [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	659,570	682,145	677,684
Vehicle Control [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	36,088	35,233	35,063
Vehicle Control [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	916	661	771
Vehicle Control [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	36,350	26,019	19,741
Vehicle Control [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	351	2,408	144
Vehicle Control [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	4,657	4,105	4,028
Vehicle Control [Member] | Engine Management (Ignition, Emissions and Fuel Delivery [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	450,180	454,571	444,196
Vehicle Control [Member] | Electrical and Safety [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	221,782	230,487	224,520
Vehicle Control [Member] | Wire Sets and Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	65,970	65,513	68,715
Temperature Control [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	337,754	351,237	324,080
Temperature Control [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	319,904	335,281	309,247
Temperature Control [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	17,081	14,596	13,585
Temperature Control [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	8	75	153
Temperature Control [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	49	401	358
Temperature Control [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	526	63	101
Temperature Control [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	186	821	636
Temperature Control [Member] | AC System Components [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	237,756	245,484	231,466
Temperature Control [Member] | Other Thermal Components [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	99,998	105,753	92,614
Engineered Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	282,586	270,007	237,305
Engineered Solutions [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	168,878	191,678	147,447
Engineered Solutions [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	25,689	16,762	13,912
Engineered Solutions [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	59,266	37,784	26,759
Engineered Solutions [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	6,658	4,897	5,547
Engineered Solutions [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	19,522	16,715	40,771
Engineered Solutions [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	2,573	2,171	2,869
Engineered Solutions [Member] | Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	83,025	80,275	76,066
Engineered Solutions [Member] | Construction/Agriculture [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	43,402	42,385	33,220
Engineered Solutions [Member] | Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	92,759	91,533	86,440
Engineered Solutions [Member] | All Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	63,400	55,814	41,579
Other [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other [Member] | United States [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other [Member] | Canada [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other [Member] | Mexico [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	0	0	0
Other [Member] | Other Foreign [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of net sales	$ 0	$ 0	$ 0

Commitments and Contingencies,

Commitments and Contingencies, Rent (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Rent [Abstract]
Total rent expense	$ 19,706	$ 14,135	$ 12,065
Expenses related to non lease components	3,300	2,700	2,000
Real Estate [Member]
Rent [Abstract]
Total rent expense	15,735	11,385	9,500
Other [Member]
Rent [Abstract]
Total rent expense	$ 3,971	$ 2,750	$ 2,565

Commitments and Contingencies_2

Commitments and Contingencies, Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Warranties [Abstract]
Warranty expense	$ 120,000	$ 112,500	$ 91,900
Changes in product warranties [Roll forward]
Balance, beginning of period	19,667	17,463
Liabilities accrued for current year sales	120,027	112,477
Settlements of warranty claims	(118,560)	(110,273)
Balance, end of period	$ 21,134	$ 19,667	$ 17,463

Commitments and Contingencies_3

Commitments and Contingencies, Letters of Credit and Asbestos (Details) $ in Thousands	1 Months Ended				12 Months Ended			268 Months Ended
	Sep. 30, 2023 USD ($)	Aug. 31, 2023 USD ($)	May 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) Officer Claim	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) Claim
Letters of Credit and Asbestos [Abstract]
Number of key officers | Officer					1
Accrued asbestos liabilities					$ 72,013	$ 63,305		$ 72,013
Litigation settlement, amount awarded to other party		$ 10,500	$ 11,000
Pre-tax provision in earnings (loss) From discontinue operations					10,500
Credit in earnings (loss) From discontinue operations					500
Financial Standby Letter of Credit [Member]
Letters of Credit and Asbestos [Abstract]
Outstanding letters of credit with certain vendors					$ 2,300	2,400		$ 2,300
Asbestos [Member]
Letters of Credit and Asbestos [Abstract]
Pending claims, approximate number | Claim					1,390			1,390
Payment for settled claims and awards related damages, including interest								$ 74,600
Increase in range of possible loss from lower range				$ 15,200
Increase in range of possible loss from upper range				$ 23,700
Accrued asbestos liabilities	$ 84,000
Incremental pre-tax provision	$ 23,800
Asbestos [Member] | Minimum [Member]
Letters of Credit and Asbestos [Abstract]
Range of possible loss		84,000
Asbestos [Member] | Maximum [Member]
Letters of Credit and Asbestos [Abstract]
Range of possible loss		135,300
Asbestos [Member] | Discontinued Operations [Member]
Letters of Credit and Asbestos [Abstract]
Total operating cash outflows related to discontinued operations					$ 11,000	$ 12,000	$ 8,800
Asbestos [Member] | Discontinued Operations [Member] | Minimum [Member]
Letters of Credit and Asbestos [Abstract]
Range of possible loss		53,100
Asbestos [Member] | Discontinued Operations [Member] | Maximum [Member]
Letters of Credit and Asbestos [Abstract]
Range of possible loss		$ 105,200

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2022 USD ($) Customer		Dec. 31, 2021 USD ($)
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of year	$ 5,375,000	$ 6,170,000		$ 5,822,000
Charged to costs and expenses	15,389,000	19,698,000		14,277,000
Other	0	0		0
Deductions	12,719,000	20,493,000		13,929,000
Balance at end of year	$ 8,045,000	$ 5,375,000		6,170,000
Bankruptcy [Abstract]
Number of customers who filed a petition | Customer	1	1
Customer bankruptcy charge	$ 0	$ 7,002,000		0
Allowance for Expected Credit Losses [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of year	4,129,000	4,815,000		4,406,000
Charged to costs and expenses	2,940,000	6,242,000	[1]	450,000
Other	0	0		0
Deductions	185,000	6,928,000		41,000
Balance at end of year	6,884,000	4,129,000		4,815,000
Allowance for Discounts [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of year	1,246,000	1,355,000		1,416,000
Charged to costs and expenses	12,449,000	13,456,000		13,827,000
Other	0	0		0
Deductions	12,534,000	13,565,000		13,888,000
Balance at end of year	1,161,000	1,246,000		1,355,000
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts [Roll Forward]
Balance at beginning of year	37,169,000	42,412,000		40,982,000
Charged to costs and expenses	162,525,000	152,985,000		129,964,000
Other	0	0		0
Deductions	161,456,000	158,228,000		128,534,000
Balance at end of year	$ 38,238,000	$ 37,169,000		$ 42,412,000
[1] Includes a $7 million charge relating to one of our customers that filed a petition for bankruptcy in January 2023.