Nature of Operations and Presentation of Condensed Consolidated Financial Statements (Policies)	3 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations The principal business of Superior Industries International, Inc. (referred herein as the “Company,” “Superior,” or “we” and “our”) is the design and manufacture of aluminum wheels for sale to original equipment manufacturers (“OEMs”) in North America and Europe and to the aftermarket in Europe. We employ approximately 6,800 full-time employees, operating in seven manufacturing facilities in North America and Europe. We are one of the largest aluminum wheel suppliers to global OEMs and one of the leading European aluminum wheel aftermarket manufacturers and suppliers. Our OEM aluminum wheels accounted for approximately 92 percent of our sales in the first three months of 2024 and are primarily sold for factory installation on vehicle models manufactured by BMW (including Mini), Ford, GM, Honda, Jaguar-Land Rover, Lucid Motors, Mazda, Mitsubishi, Nissan, Peugeot, Renault, Stellantis, Subaru, Suzuki, Toyota, VW Group (Volkswagen, Audi, Skoda and Porsche) and Volvo. We sell aluminum wheels to the European aftermarket under the brands ATS, RIAL, ALUTEC and ANZIO. North America and Europe represent the principal markets for our products, but we have a diversified global customer base consisting of North American, European and Asian OEMs. We have determined that our North American and European operations should be treated as separate reportable segments as further described in Note 5, “Business Segments.”
Presentation of Condensed Consolidated Financial Statements	Presentation of Condensed Consolidated Financial Statements The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all the information and notes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements, in our opinion, include all adjustments, of a normal and recurring nature, which are necessary for fair presentation of the financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with our consolidated financial statements and notes thereto filed with the SEC in our 2023 Annual Report on Form 10-K. These unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions are eliminated in consolidation. Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results.
Cash Paid for Interest and Taxes and Non-Cash Investing Activities	Cash Paid for Interest and Taxes and Noncash Investing Activities Cash paid for interest was $12.2 million and $11.9 million for the three months ended March 31, 2024 and March 31, 2023, respectively. Net cash paid for income taxes was $3.2 million and $3.5 million for the three months ended March 31, 2024 and March 31, 2023, respectively. As of March 31, 2024 and March 31, 2023, $3.4 million and $2.9 million, respectively, of equipment had been purchased but not yet paid and was included in accounts payable in our condensed consolidated balance sheets.
Accounting Standards Issued But Not Yet Adopted	Accounting Standards Issued But Not Yet Adopted Accounting Standards Update (ASU) 2023-07, “Segment Reporting.” In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance. Accounting Standards Update (ASU) 2023-09, “Income Taxes (Topic 740).” In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which is intended to enhance the transparency, decision usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. The Company is currently evaluating the impact of adopting this guidance.
Fair Value Measurements	The Company applies fair value accounting for all financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis, while other assets and liabilities are measured at fair value on a nonrecurring basis, such as an asset impairment. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 - Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability. The carrying amounts for cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity.
Derivatives, Methods of Accounting, Hedging Derivatives	We use derivatives to partially offset our exposure to foreign currency, interest rate, aluminum and other commodity price risks. We may enter into forward contracts, option contracts, swaps, collars or other derivative instruments to offset some of the risk on expected future cash flows and on certain existing assets and liabilities. However, we may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations and the prohibitive economic cost of hedging particular exposures. There can be no assurance the hedges will fully offset the financial impact resulting from movements in foreign currency exchange rates, interest rates, and aluminum or other commodity prices. To help mitigate gross margin and cash flow fluctuations due to changes in foreign currency exchange rates, certain of our subsidiaries, whose functional currency is the U.S. dollar or the Euro, hedge a portion of their forecasted foreign currency costs denominated in the Mexican Peso and Polish Zloty, respectively. We may hedge portions of our forecasted foreign currency exposure up to 48 months. We account for our derivative instruments as either assets or liabilities and adjust them to fair value each period. For derivative instruments that hedge the exposure to variability in expected future cash flows and are designated as cash flow hedges, the gain or loss on the derivative instrument is recorded in accumulated other comprehensive income (“AOCI”) or loss in shareholders’ equity or deficit until the hedged item is recognized in earnings, at which point accumulated gains or losses are recognized in earnings and classified with the underlying hedged transactions. Derivatives that do not qualify or have not been designated as hedges are adjusted to fair value through earnings in the financial statement line item to which the derivative relates.

Nature of Operations and Presentation of Condensed Consolidated Financial Statements (Policies)

3 Months Ended

Mar. 31, 2024

The principal business of Superior Industries International, Inc. (referred herein as the “Company,” “Superior,” or “we” and “our”) is the design and manufacture of aluminum wheels for sale to original equipment manufacturers (“OEMs”) in North America and Europe and to the aftermarket in Europe. We employ approximately 6,800 full-time employees, operating in seven manufacturing facilities in North America and Europe. We are one of the largest aluminum wheel suppliers to global OEMs and one of the leading European aluminum wheel aftermarket manufacturers and suppliers. Our OEM aluminum wheels accounted for approximately 92 percent of our sales in the first three months of 2024 and are primarily sold for factory installation on vehicle models manufactured by BMW (including Mini), Ford, GM, Honda, Jaguar-Land Rover, Lucid Motors, Mazda, Mitsubishi, Nissan, Peugeot, Renault, Stellantis, Subaru, Suzuki, Toyota, VW Group (Volkswagen, Audi, Skoda and Porsche) and Volvo. We sell aluminum wheels to the European aftermarket under the brands ATS, RIAL, ALUTEC and ANZIO. North America and Europe represent the principal markets for our products, but we have a diversified global customer base consisting of North American, European and Asian OEMs. We have determined that our North American and European operations should be treated as separate reportable segments as further described in Note 5, “Business Segments.”

Presentation of Condensed Consolidated Financial Statements

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all the information and notes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements, in our opinion, include all adjustments, of a normal and recurring nature, which are necessary for fair presentation of the financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with our consolidated financial statements and notes thereto filed with the SEC in our 2023 Annual Report on Form 10-K.

These unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions are eliminated in consolidation.

Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results.

Cash Paid for Interest and Taxes and Non-Cash Investing Activities

Cash Paid for Interest and Taxes and Noncash Investing Activities

Cash paid for interest was $12.2 million and $11.9 million for the three months ended March 31, 2024 and March 31, 2023, respectively. Net cash paid for income taxes was $3.2 million and $3.5 million for the three months ended March 31, 2024 and March 31, 2023, respectively. As of March 31, 2024 and March 31, 2023, $3.4 million and $2.9 million, respectively, of equipment had been purchased but not yet paid and was included in accounts payable in our condensed consolidated balance sheets.

Accounting Standards Issued But Not Yet Adopted

Accounting Standards Update (ASU) 2023-07, “Segment Reporting.” In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance.

Accounting Standards Update (ASU) 2023-09, “Income Taxes (Topic 740).” In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which is intended to enhance the transparency, decision

usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. The Company is currently evaluating the impact of adopting this guidance.

Fair Value Measurements

The Company applies fair value accounting for all financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis, while other assets and liabilities are measured at fair value on a nonrecurring basis, such as an asset impairment. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability.

The carrying amounts for cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity.

Derivatives, Methods of Accounting, Hedging Derivatives

We use derivatives to partially offset our exposure to foreign currency, interest rate, aluminum and other commodity price risks. We may enter into forward contracts, option contracts, swaps, collars or other derivative instruments to offset some of the risk on expected future cash flows and on certain existing assets and liabilities. However, we may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations and the prohibitive economic cost of hedging particular exposures. There can be no assurance the hedges will fully offset the financial impact resulting from movements in foreign currency exchange rates, interest rates, and aluminum or other commodity prices.

To help mitigate gross margin and cash flow fluctuations due to changes in foreign currency exchange rates, certain of our subsidiaries, whose functional currency is the U.S. dollar or the Euro, hedge a portion of their forecasted foreign currency costs denominated in the Mexican Peso and Polish Zloty, respectively. We may hedge portions of our forecasted foreign currency exposure up to 48 months.

We account for our derivative instruments as either assets or liabilities and adjust them to fair value each period. For derivative instruments that hedge the exposure to variability in expected future cash flows and are designated as cash flow hedges, the gain or loss on the derivative instrument is recorded in accumulated other comprehensive income (“AOCI”) or loss in shareholders’ equity or deficit until the hedged item is recognized in earnings, at which point accumulated gains or losses are recognized in earnings and classified with the underlying hedged transactions. Derivatives that do not qualify or have not been designated as hedges are adjusted to fair value through earnings in the financial statement line item to which the derivative relates.