Superior Industries International (SUP) 10-K 5 Mar 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 26, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Trading Symbol	SUP
Entity Registrant Name	SUPERIOR INDUSTRIES INTERNATIONAL, INC.
Entity Central Index Key	0000095552
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		25,591,930
Entity Public Float			$ 43,506,281
Smaller Reporting Company	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NYSE
Entity Shell Company	false
Entity File Number	1-6615
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-2594729
Entity Address, Address Line One	26600 Telegraph Road
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Southfield
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48033
City Area Code	248
Local Phone Number	352-7300
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s 2021 Proxy Statement, to be filed with the Securities and Exchange Commission within 120 days after the close of the registrant’s fiscal year, are incorporated by reference into Part III of this Form 10-K.

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
NET SALES	$ 1,100,760	$ 1,372,487
Cost of sales	1,035,134	1,256,425
GROSS PROFIT	65,626	116,062
Selling, general and administrative expenses	52,420	63,883
Impairment of goodwill and indefinite-lived intangibles	193,641	102,238
LOSS FROM OPERATIONS	(180,435)	(50,059)
Interest expense, net	(45,418)	(47,011)
Other (expense) income, net	(2,827)	4,033
LOSS BEFORE INCOME TAXES	(228,680)	(93,037)
Income tax provision	(14,881)	(3,423)
NET LOSS	$ (243,561)	$ (96,460)
LOSS PER SHARE – BASIC	$ (10.81)	$ (5.10)
LOSS PER SHARE – DILUTED	$ (10.81)	$ (5.10)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (243,561)	$ (96,460)
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	14,197	(5,168)
Change in unrecognized gains (losses) on derivative instruments:
Change in fair value of derivatives	(13,453)	17,515
Tax benefit (provision)	1,764	(4,359)
Change in unrecognized gains (losses) on derivative instruments, net of tax	(11,689)	13,156
Defined benefit pension plan:
Actuarial losses on pension obligation, net of amortization	(1,876)	(4,086)
Tax benefit		1,515
Pension changes, net of tax	(1,876)	(2,571)
Other comprehensive income, net of tax	632	5,417
Comprehensive loss	$ (242,929)	$ (91,043)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 152,423,000	$ 77,927,000
Accounts receivable, net	48,995,000	76,786,000
Inventories, net	154,980,000	168,470,000
Income taxes receivable	4,957,000	4,630,000
Other current assets	22,301,000	26,375,000
Total current assets	383,656,000	354,188,000
Property, plant and equipment, net	522,124,000	529,282,000
Deferred income tax assets, net	30,860,000	38,607,000
Goodwill	0	184,832,000
Intangibles, net	110,796,000	137,078,000
Other non-current assets	61,889,000	67,880,000
Total assets	1,109,325,000	1,311,867,000
Current liabilities:
Accounts payable	151,839,000	123,112,000
Short-term debt	6,112,000	4,010,000
Accrued expenses	71,079,000	60,845,000
Income taxes payable	2,107,000	3,148,000
Total current liabilities	231,137,000	191,115,000
Long-term debt (less current portion)	625,492,000	611,025,000
Non-current income tax liabilities	7,635,000	6,523,000
Deferred income tax liabilities, net	9,104,000	12,369,000
Other non-current liabilities	76,426,000	71,640,000
Commitments and contingent liabilities (Note 19)
Mezzanine equity:
Preferred stock, $0.01 par value Authorized - 1,000,000 shares Issued and outstanding – 150,000 shares outstanding at December 31, 2020 and December 31, 2019	179,387,000	160,980,000
European non-controlling redeemable equity	1,666,000	6,525,000
Shareholders’ equity (deficit):
Common stock, $0.01 par value Authorized - 100,000,000 shares Issued and outstanding – 25,591,930 and 25,128,158 shares at December 31, 2020 and December 31, 2019	95,247,000	93,331,000
Accumulated other comprehensive loss	(99,446,000)	(100,078,000)
Retained earnings	(17,323,000)	258,437,000
Total shareholders’ equity (deficit)	(21,522,000)	251,690,000
Total liabilities, mezzanine equity and shareholders’ equity (deficit)	$ 1,109,325,000	$ 1,311,867,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	150,000	150,000
Preferred stock, shares outstanding	150,000	150,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	25,591,930	25,128,158
Common stock, shares outstanding	25,591,930	25,128,158

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Unrecognized Gains (Losses) on Derivative Instruments	Pension Obligations	Cumulative Translation Adjustment	Retained Earnings
Beginning of period at Dec. 31, 2018	$ 373,265	$ 87,723	$ (3,205)	$ (3,000)	$ (99,290)	$ 391,037
Beginning of the period (in shares) at Dec. 31, 2018		25,019,237
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(96,460)					(96,460)
Change in unrecognized gains/losses on derivative instruments, net of tax	13,156		13,156
Change in defined benefit plans, net of taxes	(2,571)			(2,571)
Net foreign currency translation adjustment	(5,168)				(5,168)
Common stock issued, net of shares withheld for employee taxes (in shares)		108,921
Stock-based compensation	5,608	$ 5,608
Cash dividend declared	(4,597)					(4,597)
Redeemable preferred 9% dividend, participating dividend and accretion	(30,977)					(30,977)
European non-controlling redeemable equity dividend	(566)					(566)
End of period at Dec. 31, 2019	$ 251,690	$ 93,331	9,951	(5,571)	(104,458)	258,437
End of the period (in shares) at Dec. 31, 2019	25,128,158	25,128,158
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (243,561)					(243,561)
Change in unrecognized gains/losses on derivative instruments, net of tax	(11,689)		(11,689)
Change in defined benefit plans, net of taxes	(1,876)			(1,876)
Net foreign currency translation adjustment	14,197				14,197
Common stock issued, net of shares withheld for employee taxes (in shares)		463,772
Stock-based compensation	1,916	$ 1,916
Redeemable preferred 9% dividend, participating dividend and accretion	(31,994)					(31,994)
European non-controlling redeemable equity dividend	(205)					(205)
End of period at Dec. 31, 2020	$ (21,522)	$ 95,247	$ (1,738)	$ (7,447)	$ (90,261)	$ (17,323)
End of the period (in shares) at Dec. 31, 2020	25,591,930	25,591,930

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Deficit) (Parenthetical)	12 Months Ended
	Dec. 31, 2019$ / shares
Statement Of Stockholders Equity [Abstract]
Cash dividend declared per share	$ 0.18
Preferred stock, dividend rate, percentage	9.00%

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (243,561)	$ (96,460)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	98,178	100,722
Income tax, non-cash changes	7,489	(3,504)
Impairment of goodwill and indefinite-lived intangibles	193,641	102,238
Stock-based compensation	2,374	5,716
Amortization of debt issuance costs	4,020	4,843
Other non-cash items	5,776	(714)
Accounts receivable	28,052	26,737
Inventories	20,921	5,262
Other assets and liabilities	11,257	7,424
Accounts payable	24,523	7,479
Income taxes	(2,549)	3,099
NET CASH PROVIDED BY OPERATING ACTIVITIES	150,121	162,842
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(45,038)	(64,294)
Proceeds from sale of fixed assets	859
Other investing activities		9,631
NET CASH USED IN INVESTING ACTIVITIES	(44,179)	(54,663)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	11,690
Repayments of debt	(25,672)	(46,024)
Proceeds from borrowings on revolving credit facility	313,825	114,040
Repayments of borrowings on revolving credit facility	(316,910)	(114,040)
Cash dividends paid	(13,555)	(22,556)
Purchase of non-controlling redeemable shares	(5,020)	(6,681)
Payments related to tax withholdings for stock-based compensation	(458)	(108)
Finance lease payments	(960)	(1,230)
NET CASH USED IN FINANCING ACTIVITIES	(37,060)	(76,599)
Effect of exchange rate changes on cash	5,614	(1,117)
Net increase in cash and cash equivalents	74,496	30,463
Cash and cash equivalents at the beginning of the period	77,927	47,464
Cash and cash equivalents at the end of the period	$ 152,423	$ 77,927

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Superior Industries International, Inc. (referred to herein as the “Company,” “Superior,” or “we,” “us” and “our”) designs and manufactures aluminum wheels for sale to original equipment manufacturers (“OEMs”) and aftermarket customers. We are one of the largest suppliers of aluminum wheels to the world’s leading automobile and light truck manufacturers, with manufacturing operations in Mexico, Germany and Poland. Our OEM aluminum wheels are sold primarily for factory installation, as either standard equipment or optional equipment, on vehicle models manufactured by BMW (including Mini), Daimler Group (Mercedes-Benz, AMG, Smart), FCA, Ford, GM, Honda, Jaguar-Land Rover, Mazda, Nissan, PSA, Renault, Subaru, Suzuki, Toyota, VW Group (Volkswagen, Audi, SEAT, Skoda, Porsche, Bentley) and Volvo and diversified customer base consisting of North American, European and Asian OEMs. Presentation of Consolidated Financial Statements The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions are eliminated in consolidation. Accounting estimates are an integral part of the consolidated financial statements. These estimates require the use of judgments and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses in the periods presented. We believe that the accounting estimates employed are appropriate and the resulting balances are reasonable; however, due to the inherent uncertainties in making estimates, actual results could differ from the original estimates, requiring adjustments to these balances in future periods. Certain prior year amounts have been reclassified to conform with the current year presentation. Cash and Cash Equivalents Cash and cash equivalents generally consist of cash, certificates of deposit, fixed deposits and money market funds with original maturities of three months or less. Derivative Financial Instruments and Hedging Activities Our derivatives are over-the counter customized derivative instruments and are not exchange traded. 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 that are designated as cash flow hedges, the gain or loss on the derivative instrument is recorded in accumulated other comprehensive income 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 transaction. 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. Refer to Note 4, “Derivative Financial Instruments” for additional information pertaining to our derivative instruments. We enter into contracts to purchase certain commodities used in the manufacture of our products, such as aluminum, natural gas and other raw materials. These contracts are considered to be derivative instruments under U.S. GAAP; however, these purchase contracts are not accounted for as derivatives because they qualify for the normal purchase normal sale exemption. Accounts Receivable Accounts receivable primarily consists of amounts that are due and payable from our customers for the sale of aluminum wheels. We evaluate the collectability of receivables each reporting period and record an allowance for doubtful accounts representing our estimate of probable losses. Additions to the allowance are charged to bad debt expense reported in selling, general and administrative expense. Inventory Inventories, which are categorized as raw materials, work-in-process or finished goods, are stated at the lower of cost or net realizable value. The cost of inventories is measured using the FIFO (first-in, first-out) method or the average cost method. Inventories are reviewed to determine if inventory quantities are in excess of forecasted usage or if they have become obsolete. Aluminum is the primary material component in our inventories. In 2020 and 2019, the Company had three and four aluminum suppliers, respectively, which individually exceeded 10 percent of total aluminum purchases and, in the aggregate, represented 55.0 percent and 62.9 percent of our total aluminum purchases, respectively. Property, Plant and Equipment Property, plant and equipment are carried at cost, less accumulated depreciation. The cost of additions, improvements and interest during construction, if any, are capitalized. Our maintenance and repair costs are charged to expense when incurred. Depreciation is calculated generally on the straight-line method based on the estimated useful lives of the assets. Classification Expected Useful Life Buildings 15 to 50 years Machinery and equipment 3 to 20 years Leasehold Improvements Lease term When property, plant and equipment is replaced, retired or otherwise disposed, the cost and related accumulated depreciation are removed and any resulting gain or loss on the disposition of an operating asset is included in income or loss from operations. Any gain or loss on the disposition of a non-operating asset is included in other income or expense. Impairment of Long-Lived Assets The carrying amount of long-lived assets to be held and used in the business is evaluated for impairment when events and circumstances warrant. An impairment loss occurs when the carrying value of the long-lived assets exceeds the undiscounted cash flows expected to be realized from the use and eventual disposition of those assets. If the carrying amount of a long-lived asset group is considered impaired, a loss is recorded based on the amount by which the carrying amount exceeds fair value. Fair value is determined primarily by discounting the estimated expected cash flows. Goodwill Goodwill is not amortized but is tested for impairment on at least an annual basis. Impairment testing is required more often than annually if an event or circumstance indicates that an impairment is more likely than not to have occurred. If the net book value of a reporting unit exceeds its fair value, an impairment loss is measured and recognized. We conduct our annual impairment testing as of December 31. Impairment charges, if any, related to goodwill are recorded as a separate charge included in income or loss from operations. In the first quarter of 2020 and fourth quarter of 2019, we recognized goodwill impairment charges of $182.6 million and $99.5 million, respectively, relating to our European reporting unit Intangible Assets Intangible assets include both finite and indefinite-lived intangible assets. Finite-lived i ntangible assets consist of brand names, technology and customer relationships. Finite-lived intangible assets are amortized on a straight-line basis over their estimated useful lives (since the pattern in which the asset will be consumed cannot be reliably determined). Indefinite-lived intangible assets, excluding goodwill, consist of trade names associated with our aftermarket business. Impairment charges, if any, related to intangible assets are recorded as a separate charge included in income or loss from operations. In the first quarter of 2020 and fourth quarter of 2019, we recognized indefinite-lived intangible impairment charges of $11.0 million and $2.7 million, respectively, relating to trade names used in our European aftermarket busines Foreign Currency Transactions and Translation The assets and liabilities of foreign subsidiaries that use local currency as their functional currency are translated to U.S. dollars based on the current exchange rate prevailing at each balance sheet date and any resulting translation adjustments are included in accumulated other comprehensive income or loss. The assets and liabilities of foreign subsidiaries whose local currency is not their functional currency are remeasured from their local currency to their functional currency and then translated to U.S. dollars. Revenues and expenses are translated into U.S. dollars using the average exchange rates prevailing for each period presented. Gains and losses arising from foreign currency transactions and the effects of remeasurement discussed in the preceding paragraph are recorded in other income or expense. We recognized foreign currency transaction gains (losses) of $(2.4) million and $0.5 million in 2020 and 2019, respectively. Revenue Recognition Revenue is recognized when performance obligations under our contracts are satisfied. Generally, this occurs upon shipment when control of products transfers to our customers. At this point, revenue is recognized in an amount reflecting the consideration we expect to be entitled to under the terms of our contract. The Company maintains long term business relationships with our OEM customers and aftermarket distributors; however, there are no definitive long-term volume commitments under these arrangements. Volume commitments are limited to near-term customer requirements authorized under purchase orders or production releases generally with delivery periods of approximately one month. Sales do not involve any significant financing component since customer payment is generally due 40-60 days after shipment. Contract assets and liabilities consist of customer receivables and deferred revenues related to tooling. At contract inception, the Company assesses goods and services promised in its contracts with customers and identifies a performance obligation for each promise to deliver a good or service (or bundle of goods or services) that is distinct. Principal performance obligations under our customer contracts consist of the manufacture and delivery of aluminum wheels, including production wheels, service wheels and replacement wheels. As a part of the manufacture of the wheels, we develop tooling necessary to produce the wheels. Accordingly, tooling costs, which are explicitly recoverable from our customers, are capitalized as preproduction costs and amortized to cost of sales over the average life of the vehicle wheel program. Similarly, customer reimbursement for tooling costs is deferred and amortized to net sales over the average life of the vehicle wheel program. In the normal course of business, the Company’s warranties are limited to product specifications and the Company does not accept product returns unless the item is defective as manufactured. Accordingly, warranty costs are treated as a cost of fulfillment subject to accrual, rather than a performance obligation. The Company establishes provisions for both estimated returns and warranties when revenue is recognized. In addition, the Company does not typically provide customers with the right to a refund but provides for product replacement. Prices allocated to production, service and replacement wheels are based on prices established in our customer purchase orders which represent the standalone selling price. Prices for service and replacement wheels are commensurate with production wheels with adjustment for any special packaging. In addition, prices are subject to adjustment for changes in commodity prices for certain raw materials, aluminum and silicon, as well as production efficiencies and wheel weight variations from specifications used in pricing. These price adjustments are treated as variable consideration. Customer tooling reimbursement is generally based on quoted prices or cost not to exceed quoted prices. We estimate variable consideration by using the “most likely” amount estimation approach. For commodity prices, initial estimates are based on the commodity index at contract inception. Changes in commodity prices are monitored and revenue is adjusted as changes in the commodity index occur. Prices incorporate the wheel weight price component based on product specifications. Weights are monitored, and prices are adjusted as variations arise. Price adjustments due to production efficiencies are generally recognized as and when negotiated with customers. Customer contract prices are generally adjusted quarterly to incorporate price adjustments. Under the Company’s policies, shipping costs are treated as a cost of fulfillment. In addition, the Company does not disclose remaining performance obligations under its contracts since contract terms are substantially less than a year (generally less than one month). Our revenue recognition practices and related transactions and balances are further described in Note 2, “Revenue.” Stock-Based Compensation We account for stock-based compensation using the estimated fair value recognition method. We recognize these compensation costs net of the applicable forfeiture rate on a straight-line basis for only those shares expected to vest over the requisite service period of the award, which is generally the vesting term of three years. We estimate the forfeiture rate based on our historical experience. Refer to Note 18, “Stock-Based Compensation” for additional information concerning our stock-based compensation awards. Income Taxes We account for income taxes using the asset and liability method. The asset and liability method requires the recognition of deferred tax assets and liabilities for expected future tax consequences of temporary differences that currently exist between the tax basis and financial reporting basis of our assets and liabilities. We calculate current and deferred tax provisions based on estimates and assumptions that could differ from actual results reflected on the income tax returns filed during the following years. Adjustments based on filed returns are recorded when identified in the subsequent years. The effect on deferred taxes for a change in tax rates is recognized in income in the period that the tax rate change is enacted. The ability to realize deferred tax assets depends on the ability to generate sufficient taxable income in the future. We account for uncertain tax positions utilizing a two-step approach to evaluate tax positions. Step one, recognition, requires evaluation of the tax position to determine if based solely on technical merits it is more likely than not to be sustained upon examination. Step two, measurement, is addressed only if a position is more likely than not to be sustained. In step two, the tax benefit is measured as the largest amount of benefit, determined on a cumulative probability basis, which is more likely than not to be realized upon ultimate settlement with tax authorities. If a position does not meet the more likely than not threshold for recognition in step one, no benefit is recorded until the first subsequent period in which the more likely than not standard is met, the issue is resolved with the taxing authority, or the statute of limitations expires. Positions previously recognized are derecognized when we subsequently determine the position no longer is more likely than not to be sustained. Evaluation of tax positions, their technical merits, and measurements using cumulative probability are highly subjective management estimates. Actual results could differ materially from these estimates. In 2020, we have provided deferred income taxes for the estimated U.S. federal and state income tax, foreign income tax and applicable withholding taxes on unremitted earnings of subsidiaries. Cash Paid for Interest and Taxes and Non-Cash Investing Activities Cash paid for interest was $39.6 million and $42.3 million, respectively, for the years ended December 31, 2020 and 2019. Cash paid for income taxes was $7.3 million and $9.0 million for the years ended December 31, 2020 and 2019, respectively. As of December 31, 2020 and 2019, we had purchased but not yet paid for equipment of $0.9 million and $15.6 million, respectively, which are included in accounts payable and accrued expenses in our consolidated balance sheets. New Accounting Standards Accounting Standards Update (“ASU”) 2018-13, “Fair Value Measurement .” Effective January 1, 2020, the Company adopted ASU 2018-13 which allows companies to remove, modify and add certain disclosures related to fair value measurements. The adoption of this standard did not have a significant effect on the Company’s consolidated financial statement disclosures. ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform, where certain criteria are met. These optional expedients and exceptions allow companies to elect not to apply certain accounting requirements under U.S. GAAP to contracts modified during the transition period (March 12, 2020 through December 31, 2022) due to reference rate reform. Companies exercising this election would account for a modified contract as a continuation of an existing contract. Companies are also permitted to continue to apply hedge accounting where the critical terms in a hedging relationship are modified due to reference rate reform, without de-designating and redesignating such hedges. In addition, companies may continue to assume that cash flows for hedged transactions and associated hedges affected by reference rate reform remain probable (as required for application of hedge accounting), despite the planned discontinuance of such reference rates. The Company uses LIBOR as the benchmark interest rate in its $400.0 million senior secured term loan facility (“Term Loan Facility”), $160.0 million revolving credit facility (“Revolving Credit Facility”), $65.0 million North American receivables factoring arrangement and interest rate swaps with a notional value of $200.0 million as of December 31, 2020 used to hedge interest rate fluctuations on our variable rate borrowings under the Term Loan Facility (refer to Note 4, “Derivative Financial Instruments,” Note 10, “Debt, ” and Note 20, “Receivables Factoring”). In 2020, the Company has adopted ASU 2020-04 an d will apply optional expedients and exceptions prospectively as we modify affected contracts during the transition period. The adoption of this guidance has not had, and is not expected to have, any significant effect on the Company’s consolidated financial statements. ASU 2018-14,“Compensation - Retirement Benefits - Defined Benefit Plans.” The Company has adopted ASU 2018-14, which is designed to improve the effectiveness of disclosures by removing and adding disclosures related to defined benefit plans for the fiscal year ended December 31, 2020. We have incorporated disclosures required under this ASU relating to the nature and reason for any significant actuarial gains and losses (refer to Note 16, “Retirement Plans”). The adoption of this standard did not have any significant effect on the Company’s consolidated financial statement disclosures. Accounting Standards Issued But Not Yet Adopted ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13 which requires entities to use a new impairment model based on current expected credit losses (“CECL”) rather than incurred losses. Under CECL, estimated credit losses would incorporate relevant information about past events, current conditions and reasonable and supportable forecasts and any expected credit losses would be recognized at the time of sale. As a smaller reporting company (as defined under SEC regulations), the Company is not required to adopt the standard until fiscal years beginning after December 31, 2022. We are evaluating the impact this standard will have on our financial statements and disclosures.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Revenue	NOTE 2 - REVENUE The Company disaggregates revenue from contracts with customers into our reportable segments, North America and Europe. Revenues by segment for the years ended December 31, 2020 and 2019 are summarized in Note 5, “Business Segments”. The opening and closing balances of the Company’s receivables and current and long-term contract liabilities are as follows: December 31, 2020 December 31, 2019 Change (Dollars in thousands) Customer receivables $ 40,785 $ 68,283 $ (27,498 ) Contract liabilities—current 8,249 5,880 2,369 Contract liabilities—noncurrent 13,106 13,577 (471 ) The changes in the contract liability balances primarily result from timing differences between our performance and customer payment while the decline in customer receivables is primarily due to the increase in receivables factoring (refer to Note 20, “Receivables Factoring”), as well as a decline in sales. During the years ended December 31, 2020 and 2019, the Company recognized tooling reimbursement revenue of $13.1 million and $10.7 million, respectively, which had been deferred in prior periods and was previously included in contract liability (deferred revenue), as well as revenue on tooling invoiced, deferred and partially recognized in 2020. During the year ended December 31, 2020 and 2019, the Company recognized revenue of $0.7 million and $1.7 million, respectively,

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	NOTE 3 - FAIR VALUE MEASUREMENTS The Company applies fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are required to be 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 when we have 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. Derivative Financial Instruments Our derivatives are over-the-counter customized derivative instruments and are not exchange traded. We estimate the fair value of these instruments using industry-standard valuation models such as a discounted cash flow. These models project future cash flows and discount the future amounts to a present value using market-based expectations for interest rates, foreign exchange rates, commodity prices and the contractual terms of the derivative instruments. The discount rate used is the relevant interbank deposit rate (e.g., LIBOR) plus an adjustment for non-performance risk. The following tables categorize items measured at fair value at December 31, 2020 and 2019: Fair Value Measurement at Reporting Date Using December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (Dollars in thousands) Assets Derivative contracts $ 10,218 $ — $ 10,218 $ — Total $ 10,218 $ — $ 10,218 $ — Liabilities . Derivative contracts $ 15,259 $ — $ 15,259 $ — Total $ 15,259 $ — $ 15,259 $ — Fair Value Measurement at Reporting Date Using December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (Dollars in thousands) Assets Derivative contracts $ 21,973 $ — $ 21,973 $ — Total $ 21,973 $ — $ 21,973 $ — Liabilities Derivative contracts $ 8,709 $ — $ 8,709 $ — Total $ 8,709 $ — $ 8,709 $ — Debt Instruments The carrying values of the Company’s debt instruments vary from their fair values. The fair values were determined by reference to transacted prices and quotes for these securities (Level 2). The estimated fair value, as well as the carrying value, of the Company’s debt instruments are shown below (in thousands): December 31, 2020 December 31, 2019 (Dollars in thousands) Estimated aggregate fair value $ 624,207 $ 606,093 Aggregate carrying value (1) 643,184 630,635 (1) Total debt excluding the impact of unamortized debt issuance costs.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	NOTE 4 - DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities We use derivatives to partially offset our exposure to foreign currency, interest rate, aluminum and other commodity 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 offset more than a portion of the financial impact resulting from movements in foreign currency exchange rates, interest rates, and aluminum and natural gas commodity prices. To help protect gross margins from fluctuations 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. The following tables display the fair value of derivatives by balance sheet line item at December 31, 2020 and December 31, 2019: December 31, 2020 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts designated as hedging instruments $ 1,218 $ 6,531 $ 3,435 $ 2,645 Foreign exchange forward contracts not designated as hedging instruments 1,167 — 122 — Aluminum forward contracts designated as hedging instruments 262 — — — Natural gas forward contracts designated as hedging instruments 816 224 22 70 Interest rate swap contracts designated as hedging instruments — — 4,771 4,194 Total derivative financial instruments $ 3,463 $ 6,755 $ 8,350 $ 6,909 December 31, 2019 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts designated as hedging instruments $ 7,808 $ 12,821 $ 60 $ 100 Foreign exchange forward contracts not designated as hedging instruments 1,196 — 554 — Aluminum forward contracts designated as hedging instruments 60 — 127 — Natural gas forward contracts designated as hedging instruments 81 7 1,312 727 Interest rate swap contracts designated as hedging instruments — — 2,304 3,525 Total derivative financial instruments $ 9,145 $ 12,828 $ 4,357 $ 4,352 The following table summarizes the notional amount and estimated fair value of our derivative financial instruments: December 31, 2020 December 31, 2019 Notional U.S. Dollar Amount Fair Value Notional U.S. Dollar Amount Fair Value (Dollars in thousands) Foreign exchange forward contracts designated as hedging instruments $ 421,253 $ 1,669 $ 449,181 $ 20,469 Foreign exchange forward contracts not designated as hedging instruments 71,217 1,045 73,491 642 Aluminum forward contracts designated as hedging instruments 4,068 262 9,405 (67 ) Natural gas forward contracts designated as hedging instruments 5,523 948 5,816 (1,951 ) Interest rate swap contracts designated as hedging instruments 200,000 (8,965 ) 260,000 (5,829 ) Total derivative financial instruments $ 702,061 $ (5,041 ) $ 797,893 $ 13,264 Notional amounts are presented on a net basis. The notional amounts of the derivative financial instruments do not represent amounts exchanged by the parties and, therefore, are not a direct measure of our exposure to the financial risks described above. The amounts exchanged are calculated by reference to the notional amounts and by other terms of the derivatives, such as interest rates, foreign currency exchange rates or commodity prices. The following tables summarize the gain or loss recognized in accumulated other comprehensive income or loss (“AOCI”) for the years ended December 31, 2020 and 2019, the amounts reclassified from AOCI into earnings and the amounts recognized directly into earnings for the years ended December 31, 2020 and 2019: Year Ended December 31, 2020 Amount of Gain or (Loss) Recognized in AOCI on Derivatives Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Dollars in thousands) Derivative Contracts $ (11,689 ) $ (8,365 ) $ 2,098 Total $ (11,689 ) $ (8,365 ) $ 2,098 Year Ended December 31, 2019 Amount of Gain or (Loss) Recognized in AOCI on Derivatives Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Dollars in thousands) Derivative Contracts $ 13,156 $ 3,746 $ 4,320 Total $ 13,156 $ 3,746 $ 4,320

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Business Segments	NOTE 5 - BUSINESS SEGMENTS Our North American and European operations represent separate operating segments in view of significantly different markets, customers, and products between these regions. Within each of these regions, markets, customers, products, and production processes are similar and production can be readily transferred between production facilities. Moreover, our business within each region leverages common systems, processes, and infrastructure. Accordingly, North America and Europe comprise the Company’s reportable segments. Net Sales Income (Loss) from Operations Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) North America $ 550,079 $ 704,320 $ 8,872 $ 16,713 Europe 550,681 668,167 (189,307 ) (66,772 ) $ 1,100,760 $ 1,372,487 $ (180,435 ) $ (50,059 ) Depreciation and Amortization Capital Expenditures Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) North America $ 34,935 $ 38,845 $ 24,929 $ 22,464 Europe 63,243 61,877 20,109 41,830 $ 98,178 $ 100,722 $ 45,038 $ 64,294 Property, Plant and Equipment, net Goodwill and Intangible Assets Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) North America $ 220,145 $ 237,372 $ — $ — Europe 301,979 291,910 110,796 321,910 $ 522,124 $ 529,282 $ 110,796 $ 321,910 Total Assets Year Ended December 31, 2020 2019 (Dollars in thousands) North America $ 479,873 $ 484,689 Europe 629,452 827,178 $ 1,109,325 $ 1,311,867 Geographic information See table below for our net sales and long-lived assets by location: Net Sales Property, Plant and Equipment, net Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) U.S. $ 27,919 $ 104,476 $ 7,324 $ 14,146 Mexico 522,160 599,844 212,821 223,226 Germany 212,689 245,805 82,162 74,030 Poland 337,992 422,362 219,817 217,880 $ 1,100,760 $ 1,372,487 $ 522,124 $ 529,282

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Accounts Receivable	NOTE 6 - ACCOUNTS RECEIVABLE Year Ended December 31, 2020 2019 (Dollars in thousands) Trade receivables $ 41,647 $ 71,150 Other receivables 8,211 8,503 49,858 79,653 Allowance for doubtful accounts (863 ) (2,867 ) Accounts receivable, net $ 48,995 $ 76,786 The accounts receivable from GM, VW Group and Ford represented approximately 11 percent, 5 percent and 3 percent of the total accounts receivable, respectively, at December 31, 2020 and 32 respectively, at December 31, 2019. The related percentage of our total sales to each of these three customers is shown below: 2020 Percent of Sales 2019 Percent of Sales GM 24 % 22 % VW Group 16 % 13 % Ford 11 % 15 %

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	NOTE 7 - INVENTORIES Year Ended December 31, 2020 2019 (Dollars in thousands) Raw materials $ 46,712 $ 44,245 Work in process 45,394 40,344 Finished goods 62,874 83,881 Inventories, net $ 154,980 $ 168,470 Service wheel and supplies inventory included in other non-current assets in the consolidated balance sheets totaled $12.1 million and $10.6 million at December 31, 2020 and 2019, respectively.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	NOTE 8 - PROPERTY, PLANT AND EQUIPMENT Year Ended December 31, 2020 2019 (Dollars in thousands) Land and buildings $ 149,295 $ 158,907 Machinery and equipment 899,764 856,961 Leasehold improvements and others 14,912 12,173 Construction in progress 46,718 30,179 1,110,689 1,058,220 Accumulated depreciation (588,565 ) (528,938 ) Property, plant and equipment, net $ 522,124 $ 529,282 Depreciation expense was $72.8 million and $75.8 million for the years ended December 31, 2020 and 2019, respectively. Depreciation expense for the year ended December 31, 2019 included accelerated depreciation of $7.6 million related to excess equipment arising from the plan to reduce production at our Fayetteville, Arkansas manufacturing facility (refer to Note 21, “Restructuring”).

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 9 - GOODWILL AND OTHER INTANGIBLE ASSETS At March 31, 2020, the impact of COVID-19 and uncertainty with respect to the economic effects of the pandemic had introduced significant volatility in the financial markets and was having, and continues to have, a widespread adverse effect on the automotive industry, including reductions in both consumer demand and OEM automotive production. In response to the COVID-19 pandemic, our key customers temporarily closed nearly all their production facilities in Europe and North America (our primary markets) during the quarter ended March 31, 2020. As a result, we concluded that an interim test of our goodwill was required as of March 31, 2020. More specifically, the Company concluded that the following events and circumstances, in the aggregate, indicated that it was more likely than not that the carrying value of our European reporting unit exceeded its fair value: (1) our European reporting unit’s carrying value was effectively set to fair value at December 31, 2019, due to the $102.2 million impairment charges to goodwill and indefinite-lived intangibles, (2) lower forecasted 2020 industry production volumes for Western and Central Europe, including those for our primary European customers, due to OEM shutdowns to mitigate COVID-19 spread and subsequent reduced production levels over the remainder of the year, as compared to our prior production forecasts (including estimates used in our 2019 assessment) and (3) the volatility in financial markets that both increased European interest rates due to rising credit spreads and risk premiums and lowered median European automotive market multiples. Based on the results of our quantitative analysis, we recognized a non-cash goodwill impairment charge equal to the remaining goodwill balance of $182.6 million since the carrying value exceeded the fair value of the European reporting unit by more than the amount of the goodwill balance at March 31, 2020. we recognized a non-cash impairment charge of $11.0 million related to our aftermarket trade name indefinite-lived intangible asset which was primarily attributable to a further decline in forecasted aftermarket revenues and a decline in associated profitability. Total impairment charges of $ 193.6 million were recognized as a separate charge at March 31, 2020 and included in loss from operations. We utilized both an income and a market approach, weighted 75 percent and 25 percent, respectively, to determine the fair value of the European reporting unit as part of our goodwill impairment assessment. The income approach is based on projected debt-free cash flow, which is discounted to the present value using discount factors that consider the timing and risk of cash flows. The discount rate used is the weighted average of an estimated cost of equity and of debt (“weighted average cost of capital”). The weighted average cost of capital is adjusted as necessary to reflect risk associated with the business of the European reporting unit. Financial projections are based on estimated production volumes, product prices and expenses, including raw material cost, wages, energy and other expenses. Other significant assumptions include terminal value cash flow and growth rates, future capital expenditures and changes in future working capital requirements. The market approach is based on the observed ratios of enterprise value to earnings before interest, taxes, depreciation and amortization (EBITDA) of comparable, publicly traded companies. The market approach fair value is determined by multiplying historical and anticipated financial metrics of the European reporting unit by the EBITDA pricing multiples derived from comparable, publicly traded companies . At March 31, 2020, we determined that the carrying value of the European reporting unit exceeded its fair value by an amount greater than the remaining goodwill balance. The decline in fair value was primarily due to significantly lower market multiples and increased discount rates, as well as further declines in forecasted industry production volumes in Western and Central Europe as a result of the COVID-19 pandemic and consequent economic instability. Forecasted revenues, EBITDA and cash flow for the European reporting unit also declined as compared to the prior year long-range plan due to lower forecasted industry production volumes which adversely impacted fair value under both the income and market approaches. Significant assumptions used under the income approach included a weighted average cost of capital (WACC) of 12.0 percent and a long-term growth rate of 1.5 percent, as compared to 10.0 percent and 2.0 percent, respectively, used in the 2019 assessment. In determining the WACC, management considered the level of risk inherent in the cash flow projections and current market conditions, including the significant increase in credit spreads and systemic market and Company specific risk premiums. The decline in the fair value under the market approach is attributable to the decline in the average EBITDA market multiple (4.9X EBITDA in 2020, 5.7X EBITDA in 2019) and lower forecasted EBITDA, as compared to the 2019 assessment performing The Company’s finite-lived intangible assets are amortized on a straight-line basis over their estimated useful lives. Following is a summary of the Company’s finite-lived and indefinite-lived intangible assets and goodwill as of December 31, 2020 and 2019. Year Ended December 31, 2020 Gross Carrying Amount Impairment Accumulated Amortization Currency Translation Net Carrying Amount Remaining Weighted Average Amortization Period (Dollars in thousands) Brand name $ 9,000 $ — $ (6,615 ) $ 399 $ 2,784 2-3 Technology 15,000 — (11,024 ) 666 4,642 1-3 Customer relationships 167,000 — (74,322 ) 10,692 103,370 3-8 Total finite 191,000 — (91,961 ) 11,757 110,796 Trade names 14,000 (13,772 ) — (228 ) — Indefinite Total intangibles $ 205,000 $ (13,772 ) $ (91,961 ) $ 11,529 $ 110,796 Year Ended December 31, 2020 Beginning Balance Ending Balance Gross Accumulated Impairment Net Balance Impairment Currency Translation Gross Accumulated Impairment Net Balance (Dollars in thousands) Goodwill $ 284,337 $ (99,505 ) $ 184,832 $ (182,602 ) $ (2,230 ) $ 282,107 $ (282,107 ) $ — Year Ended December 31, 2019 Gross Carrying Amount Impairment Accumulated Amortization Currency Translation Net Carrying Amount Remaining Weighted Average Amortization Period (Dollars in thousands) Brand name $ 9,000 $ — $ (4,778 ) $ 110 $ 4,332 3-4 Technology 15,000 — (7,963 ) 183 7,220 2-4 Customer relationships 167,000 — (53,681 ) 954 114,273 4-9 Total finite 191,000 — (66,422 ) 1,247 125,825 Trade names 14,000 (2,733 ) — (14 ) 11,253 Indefinite Total intangibles $ 205,000 $ (2,733 ) $ (66,422 ) $ 1,233 $ 137,078 Year Ended December 31, 2019 Beginning Balance Ending Balance Gross Accumulated Impairment Net Balance Impairment Currency Translation Gross Accumulated Impairment Net Balance (Dollars in thousands) Goodwill $ 291,434 $ — $ 291,434 $ (99,505 ) $ (7,097 ) $ 284,337 $ (99,505 ) $ 184,832 Amortization expense for these intangible assets was $25.4 million and $25.0 million for the years ended December 31, 2020 and 2019, respectively. The anticipated annual amortization expense for these intangible assets is $27.4 million for 2021, $24.3 million for 2022, $22.1

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt	NOTE 10 - DEBT A summary of long-term debt and the related weighted average interest rates is shown below: December 31, 2020 (Dollars in Thousands) Debt Instrument Total Debt Debt Issuance Costs (1) Total Debt, Net Weighted Average Interest Rate Term Loan Facility $ 349,200 $ (7,155 ) $ 342,045 4.1 % 6.00% Senior Notes 266,928 (4,425 ) 262,503 6.0 % European CapEx Loans 23,668 — 23,668 2.3 % Finance Leases 3,388 — 3,388 3.0 % $ 643,184 $ (11,580 ) 631,604 Less: Current portion (6,112 ) Long-term debt $ 625,492 December 31, 2019 (Dollars in Thousands) Debt Instrument Total Debt Debt Issuance Costs (1) Total Debt, Net Weighted Average Interest Rate Term Loan Facility $ 371,800 $ (10,192 ) $ 361,608 5.7 % 6.00% Senior Notes 243,074 (5,408 ) 237,666 6.0 % European CapEx Loan 12,693 — 12,693 2.2 % Finance Leases 3,068 — 3,068 2.9 % $ 630,635 $ (15,600 ) 615,035 Less: Current portion (4,010 ) Long-term debt $ 611,025 (1) Unamortized portion Senior Notes On June 15, 2017, Superior issued €250.0 million original principal amount of 6.00% Senior Notes due June 15, 2025 (the “Notes”). Interest on the Notes is payable semiannually, on June 15 and December 15. The Company may redeem the Notes, in whole or in part, on or after June 15, 2020 at redemption prices of 103.000 percent and 101.500 percent of the principal amount thereof if the redemption occurs during the 12-month period beginning June 15, 2020 or 2021, respectively, and a redemption price of 100 percent of the principal amount thereof on or after June 15, 2022, in each case plus accrued and unpaid interest to, but not including, the applicable redemption date. If we experience a change of control or sell certain assets, the Company may be required to offer to purchase the Notes from the holders. The Notes are senior unsecured obligations ranking equally in right of payment with all of its existing and future senior indebtedness and senior in right of payment to any subordinated indebtedness. The Notes are effectively subordinated in right of payment to the existing and future secured indebtedness of the Company, including the Senior Secured Credit Facilities (as defined below), to the extent of the assets securing such indebtedness. During the year ended December 31, 2019 the Company opportunistically purchased Notes on the open market with face value of $36.8 million (€33.0 million) for $32.3 million. The associated carrying value of the Notes, net of allocable debt issuance costs, was $35.9 million, resulting in a net gain of $3.7 million, which was included in other (expense) income, net. Guarantee The Notes are unconditionally guaranteed by all material wholly-owned direct and indirect domestic restricted subsidiaries of the Company (the “Subsidiary Guarantors”), with customary exceptions including, among other things, where providing such guarantees is not permitted by law, regulation or contract or would result in adverse tax consequences. Covenants Subject to certain exceptions, the indenture governing the Notes contains restrictive covenants that, among other things, limit the ability of Superior and the Subsidiary Guarantors to: (i) incur additional indebtedness or issue certain preferred stock; (ii) pay dividends on, or make distributions in respect of, their capital stock; (iii) make certain investments or other restricted payments; (iv) sell certain assets or issue capital stock of restricted subsidiaries; (v) create liens; (vi) merge, consolidate, transfer or dispose of substantially all of their assets; and (vii) engage in certain transactions with affiliates. These covenants are subject to several important limitations and exceptions that are described in the indenture. The indenture provides for customary events of default that include, among other things (subject in certain cases to customary grace and cure periods): (i) nonpayment of principal, premium, if any, and interest, when due; (ii) failure for 60 days to comply with any obligations, covenants or agreements in the indenture after receipt of written notice from the Bank of New York Mellon, London Branch (“the Trustee”) or holders of at least 30 percent in principal amount of the then outstanding Notes of such failure (other than defaults referred to in the foregoing clause (i)); (iii) default under any mortgage, indenture or instrument for money borrowed by the Company or certain of its subsidiaries; (iv) a failure to pay certain judgments; and (v) certain events of bankruptcy and insolvency. If an event of default occurs and is continuing, the Trustee or holders of at least 30 percent in principal amount of the then outstanding Notes may declare the principal, premium, if any, and accrued and unpaid interest on all the Notes to be due and payable. These events of default are subject to several important qualifications, limitations and exceptions that are described in the indenture. At December 31, 2020, the Company was in compliance with all covenants under the indenture governing the Notes. Senior Secured Credit Facilities On March 22, 2017, Superior entered into a senior secured credit agreement (the “Credit Agreement”) with Citibank, N.A, as Administrative Agent, Collateral Agent and Issuing Bank, JP Morgan Chase N.A., Royal Bank of Canada and Deutsche Bank A.G. New York Branch as Joint Lead Arrangers and Joint Book Runners, and the other lenders party thereto (collectively, the “Lenders”). The Credit Agreement consisted of a $400.0 million senior secured term loan facility (the “Term Loan Facility”), which matures on May 23, 2024, and a $160.0 million revolving credit facility (the “Revolving Credit Facility”) maturing on May 23, 2022, together with the Term Loan Facility, the USD Senior Secured Credit Facilities (“USD SSCF”). Borrowings under the Term Loan Facility will bear interest at a rate equal to, at the Company’s option, either (a) LIBOR for the relevant interest period, adjusted for statutory requirements, subject to a floor of 0.00 percent per annum, plus an applicable rate of 4.00 percent or (b) a base rate, subject to a floor of 2.00 percent per annum, equal to the highest of (1) the rate of interest in effect as publicly announced by the administrative agent as its prime rate, (2) the federal funds rate plus 0.50 percent and (3) LIBOR for an interest period of one month plus 1.00 percent, in each case, plus an applicable rate of 3.00 Borrowings under the Revolving Credit Facility bear interest at a rate equal to, at the Company’s option, either (a) LIBOR for the relevant interest period, with a floor of 0.00 percent per annum, plus the applicable rate or (b) a base rate, with a floor of 0.00 percent, equal to the highest of (1) the rate of interest in effect as publicly announced by the administrative agent as its prime rate, (2) the federal funds effective rate plus 0.50 percent and (3) LIBOR for an interest period of one month plus 1.00 percent, in each case, plus the applicable rate. The applicable rates for borrowings under the Revolving Credit Facility and commitment fees for unused commitments under the Revolving Credit Facility are based upon the First Lien Net Leverage Ratio effective for the preceding quarter with, LIBOR applicable rates ranging between 3.50 percent and 3.00 percent, currently 3.50 percent, base rate applicable rates between 2.50 percent and 2.00 percent, currently 2.50 percent, and commitment fees between 0.50 percent and 0.25 percent, currently 0.50 percent. Commitment fees are included in interest expense, net. As of December 31, 2020, the Company had repaid $50.8 million under the Term Loan Facility resulting in a balance of $349.2 million. As of December 31, 2020, the Company had no outstanding borrowings under the Revolving Credit Facility, had outstanding letters of credit of $4.8 million and had available unused commitments under the Revolving Credit Facility of $155.2 million. Guarantees and Collateral Security Our obligations under the Credit Agreement are unconditionally guaranteed by the Subsidiary Guarantors, with customary exceptions including, among other things, where providing such guarantees is not permitted by law, regulation or contract or would result in adverse tax consequences. The guarantees of such obligations, will be secured, subject to permitted liens and other exceptions, by substantially all of Superior’s assets and the Subsidiary Guarantors’ assets, including but not limited to: (i) a perfected pledge of all of the capital stock issued by each of the Subsidiary Guarantors’ (subject to certain exceptions) and up to 65 percent of the capital stock issued by each direct wholly-owned foreign restricted subsidiary of the Company or any guarantor (subject to certain exceptions) and (ii) perfected security interests in and mortgages on substantially all tangible and intangible personal property and material fee-owned real property of the Company and the Subsidiary Guarantors (subject to certain exceptions and exclusions). Covenants The Credit Agreement contains a number of restrictive covenants that, among other things, restrict, subject to certain exceptions, our ability to incur additional indebtedness and guarantee indebtedness, create or incur liens, engage in mergers or consolidations, sell, transfer or otherwise dispose of assets, make investments, acquisitions, loans or advances, pay dividends, distributions or other restricted payments, or repurchase our capital stock, prepay, redeem, or repurchase any subordinated indebtedness, enter into agreements which limit our ability to incur liens on our assets or that restrict the ability of restricted subsidiaries to pay dividends or make other restricted payments to us, enter into certain transactions with our affiliates and, solely with respect to the Revolving Credit Facility, requires a Total Net Leverage Ratio (calculated as defined in the Credit Agreement) of not more than 4.5 to 1.0 as of each fiscal quarter-end when outstanding borrowings, together with undrawn letters of credit exceeding $20 million, under the Revolving Credit Facility exceed 35 percent of the $160 million commitment amount. In addition, the Credit Agreement contains customary default provisions, representations and warranties and other covenants. The Credit Agreement also contains a provision permitting the Lenders to accelerate the repayment of all loans outstanding under the USD SSCF during an event of default. At December 31, 2020, the Company was in compliance with all covenants under the Credit Agreement. European Debt In connection with the acquisition of UNIWHEELS, AG in 2017, the Company assumed $70.7 million of outstanding debt, including a €30.0 million European Revolving Credit Facility (“EUR SSCF”). At December 31, 2020, a $10.7 million equipment loan remains outstanding which matures March 31, 2024, is collateralized by the financed equipment and guaranteed by Superior, and bears interest at a rate of 2.2 percent. Covenants under the loan agreement include a default provision for non-payment, as well as a material adverse change default provision pursuant to which the lender could accelerate the loan maturity. At December 31, 2020, the Company was in compliance with all covenants under the loan agreement. During the second quarter of 2019, the Company amended its EUR SSCF, increasing the available borrowing limit from €30.0 million to €45.0 million and extending the term to May 22, 2022. On January 31, 2020, the available borrowing limit of the EUR SSCF was increased from €45.0 million to €60.0 million. All other terms of the EUR SSCF remained unchanged. At December 31, 2020, the Company had no borrowings outstanding, outstanding letters of credit of $0.5 million (€0.4 million) and available unused commitments under this facility of $73.3 million (€59.6 million). The EUR SSCF bears interest at Euribor (with a floor of zero) plus a margin (ranging from 1.55 percent to 3.0 percent based on the net debt leverage ratio of Superior Industries Europe AG and its wholly owned subsidiaries, collectively “Superior Europe AG”), currently 1.55 percent. The annual commitment fee for unused commitments (ranging from 0.50 percent to 1.05 percent based on the net debt leverage ratio of Superior Europe AG) is currently 0.50 percent per annum. In addition, a management fee is assessed equal to 0.07 percent of borrowings outstanding at each month end. The commitment and management fees are both included in interest expense, net. Superior Europe AG has pledged substantially all of its assets, including land and buildings, receivables, inventory, and other moveable assets (other than collateral associated with equipment loans) as collateral under the EUR SSCF. The EUR SSCF is subject to a number of restrictive covenants that, among other things, restrict, subject to certain exceptions, the ability of Superior Europe AG to incur additional indebtedness and guarantee indebtedness, create or incur liens, engage in mergers or consolidations, sell, transfer or otherwise dispose of assets, make investments, acquisitions, loans or advances, pay dividends or distributions, or repurchase Superior Europe AG’s capital stock, prepay, redeem, or repurchase any subordinated indebtedness, and enter into agreements which limit Superior Europe AG’s ability to incur liens on our assets. In addition, the EUR SSCF includes an annual pay down provision requiring outstanding balances to be repaid but not reborrowed for a period of three business days and a material adverse change default provision pursuant to which the lender could accelerate the loan maturity. At December 31, 2020, Superior Europe AG was in compliance with all covenants under the EUR SSCF. During the fourth quarter of 2019, the Company entered into equipment loan agreements totaling $13.4 million ( € 12.0 The loans are secured with liens on the financed equipment and are subject to covenants that, among other things, include a material adverse change default provision pursuant to which the lender could accelerate the loan maturity, as well as a provision that restricts the ability of Superior Europe AG to reduce its ownership interest in Superior Industries Production Germany GmbH, its wholly-owned subsidiary and the borrower under the loan. During the first quarter of 2020, the Company had drawn down on the equipment loans and the balance outstanding at December 31, 2020 was $13.0 million (€10.6 million). Quarterly installment payments of $0.6 million (€0.5 million) under the loan agreements will begin in June 2021 Debt maturities due in the next five years and thereafter are as follows: Year Ended December 31, (Dollars in thousands) Debt Maturities Amount 2021 $ 6,112 2022 6,575 2023 6,083 2024 352,422 2025 269,326 Thereafter 2,666 Total debt liabilities $ 643,184

Redeemable Preferred Stock

Redeemable Preferred Stock	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Redeemable Preferred Stock	NOTE 11 - REDEEMABLE PREFERRED STOCK During 2017, we issued 150,000 shares of Series A (140,202 shares) and Series B (9,798 shares) Perpetual Convertible Preferred Stock, par value $0.01 per share for $150.0 million. On August 30, 2017, the Series B shares were converted into Series A redeemable preferred stock, the “redeemable preferred stock” after approval by our shareholders. The redeemable preferred stock has an initial stated value of $1,000 per share, par value of $0.01 per share and liquidation preference over common stock. The redeemable preferred stock is convertible into shares of our common stock equal to the number of shares determined by dividing the sum of the stated value and any accrued and unpaid dividends by the conversion price of $28.162. The redeemable preferred stock accrues dividends at a rate of 9 percent per annum, payable at our election either in-kind or in cash and is also entitled to participate in dividends on common stock in an amount equal to that which would have been due had the shares been converted into common stock. We may mandate conversion of the redeemable preferred stock if the price of the common stock exceeds $84.49. The holder may redeem the shares upon the occurrence of any of the following events (referred to as a “redemption event”): a change in control, recapitalization, merger, sale of substantially all of the Company’s assets, liquidation or delisting of the Company’s common stock. In addition, the holder has the right, at its option, to unconditionally redeem the shares at any time after September 14, 2025 (the “redemption date”, which was originally May 23, 2024, but was corrected to September 14, 2025 in 2018 through modification of the Certificate of Designations governing the terms and conditions of the preferred stock). We may, at our option, redeem in whole at any time all of the shares of redeemable preferred stock outstanding. At redemption by either party, the redemption value will be the greater of two The difference between the redemption value of the redeemable preferred stock and the carrying value (the “premium”) is being accreted over the period from the date of issuance through September 14, 2025 using the effective interest method. The accretion is treated as a deemed dividend, recorded as a charge to retained earnings and deducted in computing earnings per share (analogous to the treatment for stated and participating dividends paid on the redeemable preferred shares). The cumulative premium accretion as of December 31, 2020 and 2019 was $43.9 million and $25.5 million, respectively, resulting in adjusted redeemable preferred stock balances of $179.4 million and $161.0 million, respectively.

European Non-Controlling Redeem

European Non-Controlling Redeemable Equity	12 Months Ended
	Dec. 31, 2020
Noncontrolling Interest [Abstract]
European Non-Controlling Redeemable Equity	NOTE 12 - EUROPEAN NON-CONTROLLING REDEEMABLE EQUITY On May 30, 2017, the Company acquired 92.3 percent of the outstanding shares of UNIWHEELS, AG. Subsequently, the Company commenced a delisting and associated tender offer for the remaining shares. On January 17, 2018, the Company entered into a Domination and Profit and Loss Transfer agreement (“DPLTA”) retroactively effective as of January 1, 2018 pursuant to which we offered to purchase the remaining outstanding shares at €62.18 per share. This price may be subject to change based on appraisal proceedings initiated by the minority shareholders which have not yet been concluded. The Company must also pay an annual dividend of €3.23 as long as the DPLTA is in effect. For any shares tendered prior to the annual dividend payment, we must pay interest at a statutory rate, currently 4.12 percent, in place of the dividend. As a result of purchases pursuant to the tender offer and the DPLTA, the Company has increased its ownership to 99.9 percent as of December 31, 2020. In addition, the carrying value of the non-controlling interests must be adjusted to redemption value since they are currently redeemable. The following table summarizes the European non-controlling redeemable equity activity for the two year period ended December 31, 2020: (Dollars in thousands) Balance at December 31, 2018 $ 13,849 Dividends accrued 566 Dividends paid (848 ) Translation adjustment (361 ) Purchase of shares (6,681 ) Balance at December 31, 2019 6,525 Dividends accrued 205 Dividends paid (46 ) Translation adjustment 2 Purchase of shares (5,020 ) Balance at December 31, 2020 $ 1,666

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 13 - EARNINGS PER SHARE Basic earnings per share is computed by dividing net income (loss), after deducting redeemable preferred stock dividends and accretion and European non-controlling redeemable equity dividends, by the weighted average number of common shares outstanding. For purposes of calculating diluted earnings per share, the weighted average shares outstanding includes the dilutive effect of outstanding stock options and time and performance based restricted stock units under the treasury stock method. The redeemable preferred shares discussed in Note 11, “Redeemable Preferred Stock” have not been included in the calculation of diluted earnings per share because inclusion of such shares on an as converted basis would be anti-dilutive. Year Ended December 31, 2020 2019 (Dollars in thousands, except per share amounts) Basic Earnings Per Share: Net loss $ (243,561 ) $ (96,460 ) Less: Redeemable preferred stock dividends and accretion (31,994 ) (30,977 ) Less: European non-controlling redeemable equity dividend (205 ) (566 ) Basic numerator $ (275,760 ) $ (128,003 ) Basic loss per share $ (10.81 ) $ (5.10 ) Weighted average shares outstanding – Basic 25,498 25,099 Diluted Earnings Per Share: Net loss $ (243,561 ) $ (96,460 ) Less: Redeemable preferred stock dividends and accretion (31,994 ) (30,977 ) Less: European non-controlling redeemable equity dividend (205 ) (566 ) Diluted numerator $ (275,760 ) $ (128,003 ) Diluted loss per share $ (10.81 ) $ (5.10 ) Weighted average shares outstanding – Basic 25,498 25,099 Dilutive effect of common share equivalents — — Weighted average shares outstanding – Diluted 25,498 25,099

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 14 - INCOME TAXES Income/(loss) before income taxes from domestic and international jurisdictions is comprised of the following: Year Ended December 31, 2020 2019 (Dollars in thousands) Income (loss) before income taxes: Domestic $ (74,151 ) $ (60,170 ) Foreign (154,529 ) (32,867 ) $ (228,680 ) $ (93,037 ) The benefit/(provision) for income taxes is comprised of the following: Year Ended December 31, 2020 2019 (Dollars in thousands) Current taxes Federal $ 1,970 $ 3,834 State (29 ) (146 ) Foreign (9,333 ) (10,615 ) Total current taxes (7,392 ) (6,927 ) Deferred taxes Federal (4,756 ) (3,174 ) State (3,622 ) 1,014 Foreign 889 5,664 Total deferred taxes (7,489 ) 3,504 Income tax benefit (provision) $ (14,881 ) $ (3,423 ) The following is a reconciliation of the U.S. federal tax rate to our effective income tax rate: Year Ended December 31, 2020 2019 Statutory rate 21.0 % 21.0 % State tax provisions, net of federal income tax benefit 0.6 2.7 Tax credits (0.1 ) 6.6 Foreign income taxes at rates other than the statutory rate 10.9 17.7 Valuation allowance (10.4 ) (6.9 ) Changes in tax liabilities, net (0.2 ) (0.3 ) Share based compensation (0.2 ) (1.8 ) Unremitted non-U.S. Earnings (1.7 ) — US Tax on non-US income 0.8 (6.7 ) Non taxable income — 2.4 Impairment of Goodwill (25.3 ) (34.0 ) Other (1.9 ) (4.4 ) Effective income tax rate (6.5 )% (3.7 )% Tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows: Year Ended December 31, 2020 2019 (Dollars in thousands) Deferred income tax assets: Accrued liabilities $ 3,688 $ 4,695 Hedging and foreign currency gains (losses) 3,323 2,386 Deferred compensation 8,473 8,018 Inventory reserves 5,114 4,609 Net loss carryforwards and credits 48,924 38,342 Interest carryforwards 14,972 19,632 Competent authority deferred tax assets and other foreign timing differences 4,465 3,954 Other 1,714 782 Total before valuation allowance 90,673 82,418 Valuation allowance (46,490 ) (22,879 ) Net deferred income tax assets 44,183 59,539 Deferred income tax liabilities: Intangibles, property, plant and equipment and other (17,959 ) (33,301 ) Unremitted earnings (4,468 ) — Deferred income tax liabilities (22,427 ) (33,301 ) Net deferred income tax assets $ 21,756 $ 26,238 The classification of our net deferred tax asset is shown below: Year Ended December 31, 2020 2019 (Dollars in thousands) Long-term deferred income tax assets $ 30,860 $ 38,607 Long-term deferred income tax liabilities (9,104 ) (12,369 ) Net deferred tax asset $ 21,756 $ 26,238 The increase in the valuation allowance of $23.6 million to reduce the U.S. federal and state deferred tax assets is due to the assessment that the Company is not more likely than not to realize these deferred tax assets. As of December 31, 20 20 , we have cumulative tax effected U.S. federal and Germany NOL carryforwards of $ million that carryforward indefinitely and U.S. state NOL carryforwards of $ million that expire in the years 202 1 to 20 41 . Also, we have $ million of tax credit carryforwards, primarily in Poland, which expire in the years 2021 to 202 7 . The transition tax substantially eliminated the basis difference on foreign subsidiaries that existed previously for purposes of Accounting Standards Codification topic 740 (“ASC 740”). However, there are limited other taxes that could continue to apply such as foreign withholding and certain state taxes. Provisions are made for income tax liabilities on the undistributed earnings of non-U.S. subsidiaries. We account for our uncertain tax positions in accordance with U.S. GAAP. A reconciliation of the beginning and ending amounts of these tax benefits is as follows: Year Ended December 31, 2020 2019 (Dollars in thousands) Beginning balance $ 30,368 $ 31,036 Increases (decreases) due to foreign currency translations $ 2,265 (632 ) Increases (decreases) as a result of positions taken during: Prior periods (1,147 ) (36 ) Current period 372 — Expiration of applicable statutes of limitation — — Ending balance (1) $ 31,858 $ 30,368 Our policy regarding interest and penalties related to uncertain tax positions is to record interest and penalties as an element of income tax expense. At the end of 2020 and 2019, the Company had liabilities of $4.7 million and $3.9 million of potential interest and penalties associated with uncertain tax positions. Included in the unrecognized tax benefits is $4.5 million that, if recognized, would favorably affect our annual effective tax rate. Within the next twelve-month period we expect no decrease in unrecognized tax benefits. Income tax returns are filed in multiple jurisdictions and are subject to examination by tax authorities in various jurisdictions where the Company operates. The Company has open tax years from 2014 to 2019 with various significant tax jurisdictions, including ongoing tax audits in the U.S. for 2015 to 2018 and Germany for 2017 and 2018.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	NOTE 15 - The Company determines whether an arrangement is or contains a lease at the inception of the arrangement. Operating leases are accounted for in other non-current assets, accrued expenses and other non-current liabilities in our consolidated balance sheets. Finance leases are included in property, plant and equipment, net, short-term debt and long-term debt (less current portion) in our consolidated balance sheets. Right-of-use (ROU) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of the lease payments over the lease term. Since we generally do not have access to the interest rate implicit in the lease, the Company uses our incremental borrowing rate (for fully collateralized debt) at the inception of the lease in determining the present value of the lease payments. The implicit rate is, however, used where readily available. Lease expense under operating leases is recognized on a straight-line basis over the term of the lease. Certain of our leases contain both lease and non-lease components, which are accounted for separately. The Company has operating and finance leases for office facilities, a data center and certain equipment. The remaining terms of our leases range from over one year to nine years. Certain leases include options to extend the lease term for up to ten years, as well as options to terminate both of which have been excluded from the term of the lease since exercise of these options is not reasonably certain. Lease expense, cash flow, operating and finance lease assets and liabilities, average lease term and average discount rate are as follows: Year Ended December 31, 2020 2019 (Dollars in thousands) Lease Expense Finance lease expense: Amortization of right-of-use assets $ 1,219 $ 1,691 Interest on lease liabilities 85 83 Operating lease expense 3,388 3,509 Total lease expense $ 4,692 $ 5,283 Cash Flow Components Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from finance leases $ 85 $ 83 Operating cash outflows from operating leases 3,621 3,463 Financing cash outflows from finance leases 960 1,230 Right-of-use assets obtained in exchange for finance lease liabilities, net of terminations and disposals 879 2,573 Right-of-use assets obtained in exchange for operating lease liabilities, net of terminations and disposals 657 18,961 Year Ended December 31, 2020 2019 (Dollars in thousands, except lease term and discount rate) Balance Sheet Information Operating leases: Other non-current assets $ 13,598 $ 15,201 Accrued liabilities $ (2,868 ) $ (2,949 ) Other non-current liabilities (11,513 ) (13,282 ) Total operating lease liabilities $ (14,381 ) $ (16,231 ) Finance leases: Property, plant and equipment gross $ 5,735 $ 4,821 Accumulated depreciation (3,319 ) (2,118 ) Property, plant and equipment, net $ 2,416 $ 2,703 Current portion of long-term debt $ (1,113 ) $ (1,023 ) Long-term debt (less current portion) (2,275 ) (2,045 ) Total finance lease liabilities $ (3,388 ) $ (3,068 ) Lease Term and Discount Rates Weighted-average remaining lease term - finance leases (years) 3.9 4.1 Weighted-average remaining lease term - operating leases (years) 6.1 6.4 Weighted-average discount rate - finance leases 3.0 % 2.9 % Weighted-average discount rate - operating leases 3.8 % 3.9 % Summarized future minimum payments under our leases are as follows: Year Ended December 31, Amount (Dollars in thousands) Lease Maturities Finance Leases Operating Leases 2021 $ 1,186 $ 2,879 2022 1,080 2,870 2023 568 2,499 2024 160 2,279 2025 152 2,229 Thereafter 425 3,163 Total 3,571 15,919 Less: Imputed interest (183 ) (1,538 ) Total lease liabilities, net of interest $ 3,388 $ 14,381

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Retirement Plans	NOTE 16 - RETIREMENT PLANS We have an unfunded salary continuation plan covering certain directors, officers, and other key members of management. Subject to certain vesting requirements, the plan provides for a benefit based on final average compensation, which becomes payable on the employee’s death or upon attaining age 65, if retired. The plan was closed to new participants effective February 3, 2011. The following table summarizes the changes in plan assets and plan benefit obligations. Year Ended December 31, 2020 2019 (Dollars in thousands) Change in benefit obligation Beginning benefit obligation $ 31,001 $ 26,953 Interest cost 1,005 1,144 Actuarial loss 2,164 4,295 Benefit payments (1,530 ) (1,391 ) Ending benefit obligation $ 32,640 $ 31,001 The actuarial losses in 2020 and 2019 were primarily due to the decrease in discount rate. Year Ended December 31, 2020 2019 (Dollars in thousands) Change in plan assets Fair value of plan assets at beginning of year $ — $ — Employer contribution 1,475 1,391 Benefit payments (1,475 ) (1,391 ) Fair value of plan assets at end of year $ — $ — Funded status $ (32,640 ) $ (31,001 ) Amounts recognized in the consolidated balance sheets consist of: Accrued expenses $ (1,447 ) $ (1,478 ) Other non-current liabilities (31,193 ) (29,523 ) Net amount recognized $ (32,640 ) $ (31,001 ) Amounts recognized in accumulated other comprehensive loss consist of: Net actuarial loss $ 10,760 $ 8,940 Prior service cost (1 ) (1 ) Net amount recognized, before tax effect $ 10,759 $ 8,939 Weighted average assumptions used to determine benefit obligations: Discount rate 2.6 % 3.3 % Rate of compensation increase 3.0 % 3.0 % Components of net periodic pension cost are described in the following table: Year Ended December 31, 2020 2019 (Dollars in thousands) Components of net periodic pension cost: Interest cost $ 1,005 $ 1,144 Amortization of actuarial loss 288 209 Net periodic pension cost $ 1,293 $ 1,353 Weighted average assumptions used to determine net periodic pension cost: Discount rate 3.3 % 4.4 % Rate of compensation increase 3.0 % 3.0 % Benefit payments during the next ten years, which reflect applicable future service, are as follows: Year Ended December 31, Amount (Dollars in thousands) 2021 $ 1,465 2022 1,510 2023 1,492 2024 1,533 2025 1,739 Years 2026 to 2030 8,815 The following is an estimate of the components of net periodic pension cost in 2021: Estimated Year Ended December 31, 2021 (Dollars in thousands) Interest cost $ 823 Amortization of actuarial loss 387 Estimated 2021 net periodic pension cost $ 1,210 Other Retirement Plans We also contribute to employee retirement savings plans in the U.S. and Mexico that cover substantially all of our employees in those countries. The employer contribution totaled $1.3 million and $1.5 million for the years ended December 31, 2020 and 2019, respectively.

Accrued Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Accrued Expenses	NOTE 17 - ACCRUED EXPENSES Year Ended December 31, 2020 2019 (Dollars in thousands) Payroll and related benefits $ 26,930 $ 25,048 Taxes, other than income taxes 14,502 12,096 Current portion of derivative liability 8,350 4,357 Deferred tooling revenue 8,249 5,880 Short-term operating lease liability 2,868 2,949 Dividends and interest 1,453 1,247 Current portion of executive retirement liabilities 1,447 1,478 Professional fees 1,102 2,216 Other 6,178 5,574 Accrued liabilities $ 71,079 $ 60,845

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	NOTE 18 - STOCK-BASED COMPENSATION Equity Incentive Plan Our 2018 Equity Incentive Plan (the “Plan”) was approved by stockholders in May 2018 and amended and restated the 2008 Equity Incentive Plan. The Plan authorizes us to issue up to 4.35 million shares of common stock, along with non-qualified stock options, stock appreciation rights, restricted stock and performance units to our officers, key employees, non-employee directors and consultants. At December 31, 2020, there were 0.2 million shares available for future grants under this Plan. No more than 1.2 million shares may be used under the Plan as “full value” awards, which include restricted stock and performance stock units. It is our policy to issue shares from authorized but not issued shares upon the exercise of stock options. Under the terms of the Plan, each year eligible participants are granted time value restricted stock units (“RSUs”), vesting ratably over a three-year three-year Other Award On May 16, 2019 the Company granted the following equity awards to Majdi B. Abulaban, our President and Chief Executive Officer, in connection with his entering into employment with the Company and the 2019 Inducement Grant Plan (the “Inducement Plan”): (i) an initial award consisting of (a) 666,667 PSUs at target, vesting in three approximately equal installments, to the extent the performance metrics are satisfied, during each of three performance periods and (b) 333,333 RSUs, vesting in approximately equal installments on February 28, 2020, 2021 and 2022; (ii) a 2019-2021 PSU grant, with the target number of 316,832 PSUs, which will vest to the extent the performance metrics are satisfied; and (iii) a 2019 RSU grant of 158,416 RSUs, vesting in approximately equal installments on February 28, 2020, 2021 and 2022. The PSU awards may be earned at up to 200 percent of target depending on the level of achievement of the performance metrics. Restricted stock unit and restricted performance stock unit activity for the year ended December 31, 2020 is summarized in the following table: Equity Incentive Awards Restricted Stock Units Weighted Average Grant Date Fair Value Performance Shares Weighted Average Grant Date Fair Value Options Weighted Average Exercise Price Balance at December 31, 2019 1,047,256 $ 5.39 1,548,793 $ 7.17 50,250 $ 18.86 Granted 763,674 2.64 1,207,351 2.95 — — Settled (401,723 ) 6.14 (245,713 ) 5.05 — — Forfeited or expired (195,540 ) 4.27 (334,141 ) 7.44 (26,250 ) 17.46 Balance at December 31, 2020 1,213,667 $ 3.59 2,176,290 $ 4.88 24,000 $ 20.39 Vested or expected to vest at December 31, 2020 1,118,978 $ 3.59 430,624 $ 6.99 24,000 $ 20.39 Stock-based compensation expense was $2.4 million and $5.7 million for the years ended December 31, 2020 and 2019, respectively. Unrecognized stock-based compensation expense related to non-vested awards of $3.3 million is expected to be recognized over a weighted average period of approximately 1.5 years.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 19 - COMMITMENTS AND CONTINGENCIES Purchase Commitments When market conditions warrant, we may enter into purchase commitments to secure the supply of certain commodities used in the manufacture of our products, such as aluminum, natural gas and other raw materials. Prices under our aluminum contracts are based on a market index, the London Mercantile Exchange (LME), and regional premiums for processing, transportation and alloy components which are generally adjusted quarterly for purchases in the ensuing quarter. Changes in aluminum prices are generally passed through to our OEM customers and adjusted on a quarterly basis. Certain of our purchase agreements include volume commitments, however any excess commitments are generally negotiated with suppliers and those which have occurred in the past have been carried over to future periods. Contingencies We are party to various legal and environmental proceedings incidental to our business. Certain claims, suits and complaints arising in the ordinary course of business have been filed or are pending against us. Based on facts now known, we believe all such matters are adequately provided for, covered by insurance, are without merit and/or involve such amounts that would not materially adversely affect our consolidated results of operations, cash flows or financial position.

Receivables Factoring

Receivables Factoring	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Receivables Factoring	NOTE 20 - RECEIVABLES FACTORING The Company sells certain customer trade receivables on a non-recourse basis under factoring arrangements with designated financial institutions. These transactions are accounted for as sales and cash proceeds are included in cash provided by operating activities. These factoring arrangements incorporate customary representations and warranties, including representations as to validity of amounts due, completeness of performance obligations and absence of commercial disputes. During the years ended December 31, 2020 and 2019, the Company sold trade receivables totaling $522.5

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2020
Restructuring And Related Activities [Abstract]
Restructuring	NOTE 21- RESTRUCTURING During the quarter ended June 30, 2020, the Company discontinued the manufacture and sale of high-performance aftermarket wheels for the automotive racing market segment. The Company incurred a total non-cash charge of $3.4 million, including $2.8 million recorded in cost of sales, comprised of $1.3 million relating to write-downs of certain after-market inventory to salvage value, $1.0 million of employee severance costs, $0.5 million in contract terminations and other costs, as well as a $0.6 million non-cash charge recorded in selling, general and administrative expense related to non-production employee severance costs. During the six-month period ended December 31, 2020, we recognized an additional $0.7 million of severance costs, including charges to cost of sales of $0.4 million and selling, general and administrative expenses of $0.3 million. As of December 31, 2020, $1.1 million of the restructuring severance accrual remains. During the third quarter of 2019, the Company initiated a plan to significantly reduce production and manufacturing operations at its Fayetteville, Arkansas location. As a result, the Company recognized a non-cash charge of $13.0 million in cost of sales, comprised of (1) $7.6 million of accelerated depreciation for excess equipment, (2) $3.2 million relating to the write-down of certain supplies inventory to net salvage value, (3) $1.6 million of employee severance and (4) $0.6 million of accelerated amortization of right of use assets under operating leases. In addition, relocation costs for redeployment of machinery and equipment of $1.8 million were recognized in the fourth quarter of 2019. During 2020, we recognized additional relocation costs for redeployment of machinery and equipment of $2.9 million and additional other costs of $0.4 million, both as charges to cost of sales.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2020
Valuation And Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2020 and 2019 (Dollars in thousands) Additions Balance at Beginning of Year Charge to Costs and Expenses Other Deductions From Reserves Balance at End of Year 2020 Allowance for doubtful accounts receivable $ 2,867 $ 253 $ — $ (2,257 ) $ 863 Valuation allowances for deferred tax assets $ 22,879 $ 22,146 $ 1,465 $ — $ 46,490 2019 Allowance for doubtful accounts receivable $ 4,298 $ 919 $ 56 $ (2,406 ) $ 2,867 Valuation allowances for deferred tax assets $ 16,576 $ 6,822 $ — $ (519 ) $ 22,879

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations Superior Industries International, Inc. (referred to herein as the “Company,” “Superior,” or “we,” “us” and “our”) designs and manufactures aluminum wheels for sale to original equipment manufacturers (“OEMs”) and aftermarket customers. We are one of the largest suppliers of aluminum wheels to the world’s leading automobile and light truck manufacturers, with manufacturing operations in Mexico, Germany and Poland. Our OEM aluminum wheels are sold primarily for factory installation, as either standard equipment or optional equipment, on vehicle models manufactured by BMW (including Mini), Daimler Group (Mercedes-Benz, AMG, Smart), FCA, Ford, GM, Honda, Jaguar-Land Rover, Mazda, Nissan, PSA, Renault, Subaru, Suzuki, Toyota, VW Group (Volkswagen, Audi, SEAT, Skoda, Porsche, Bentley) and Volvo and diversified customer base consisting of North American, European and Asian OEMs.
Presentation of Consolidated Financial Statements	Presentation of Consolidated Financial Statements The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions are eliminated in consolidation. Accounting estimates are an integral part of the consolidated financial statements. These estimates require the use of judgments and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses in the periods presented. We believe that the accounting estimates employed are appropriate and the resulting balances are reasonable; however, due to the inherent uncertainties in making estimates, actual results could differ from the original estimates, requiring adjustments to these balances in future periods. Certain prior year amounts have been reclassified to conform with the current year presentation.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents generally consist of cash, certificates of deposit, fixed deposits and money market funds with original maturities of three months or less.
Derivative Financial Instruments and Hedging Activities	Derivative Financial Instruments and Hedging Activities Our derivatives are over-the counter customized derivative instruments and are not exchange traded. 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 that are designated as cash flow hedges, the gain or loss on the derivative instrument is recorded in accumulated other comprehensive income 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 transaction. 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. Refer to Note 4, “Derivative Financial Instruments” for additional information pertaining to our derivative instruments. We enter into contracts to purchase certain commodities used in the manufacture of our products, such as aluminum, natural gas and other raw materials. These contracts are considered to be derivative instruments under U.S. GAAP; however, these purchase contracts are not accounted for as derivatives because they qualify for the normal purchase normal sale exemption.
Accounts Receivable	Accounts Receivable Accounts receivable primarily consists of amounts that are due and payable from our customers for the sale of aluminum wheels. We evaluate the collectability of receivables each reporting period and record an allowance for doubtful accounts representing our estimate of probable losses. Additions to the allowance are charged to bad debt expense reported in selling, general and administrative expense.
Inventory	Inventory Inventories, which are categorized as raw materials, work-in-process or finished goods, are stated at the lower of cost or net realizable value. The cost of inventories is measured using the FIFO (first-in, first-out) method or the average cost method. Inventories are reviewed to determine if inventory quantities are in excess of forecasted usage or if they have become obsolete. Aluminum is the primary material component in our inventories. In 2020 and 2019, the Company had three and four aluminum suppliers, respectively, which individually exceeded 10 percent of total aluminum purchases and, in the aggregate, represented 55.0 percent and 62.9 percent of our total aluminum purchases, respectively.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are carried at cost, less accumulated depreciation. The cost of additions, improvements and interest during construction, if any, are capitalized. Our maintenance and repair costs are charged to expense when incurred. Depreciation is calculated generally on the straight-line method based on the estimated useful lives of the assets. Classification Expected Useful Life Buildings 15 to 50 years Machinery and equipment 3 to 20 years Leasehold Improvements Lease term When property, plant and equipment is replaced, retired or otherwise disposed, the cost and related accumulated depreciation are removed and any resulting gain or loss on the disposition of an operating asset is included in income or loss from operations. Any gain or loss on the disposition of a non-operating asset is included in other income or expense.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The carrying amount of long-lived assets to be held and used in the business is evaluated for impairment when events and circumstances warrant. An impairment loss occurs when the carrying value of the long-lived assets exceeds the undiscounted cash flows expected to be realized from the use and eventual disposition of those assets. If the carrying amount of a long-lived asset group is considered impaired, a loss is recorded based on the amount by which the carrying amount exceeds fair value. Fair value is determined primarily by discounting the estimated expected cash flows.
Goodwill	Goodwill Goodwill is not amortized but is tested for impairment on at least an annual basis. Impairment testing is required more often than annually if an event or circumstance indicates that an impairment is more likely than not to have occurred. If the net book value of a reporting unit exceeds its fair value, an impairment loss is measured and recognized. We conduct our annual impairment testing as of December 31. Impairment charges, if any, related to goodwill are recorded as a separate charge included in income or loss from operations. In the first quarter of 2020 and fourth quarter of 2019, we recognized goodwill impairment charges of $182.6 million and $99.5 million, respectively, relating to our European reporting unit
Intangible Assets	Intangible Assets Intangible assets include both finite and indefinite-lived intangible assets. Finite-lived i ntangible assets consist of brand names, technology and customer relationships. Finite-lived intangible assets are amortized on a straight-line basis over their estimated useful lives (since the pattern in which the asset will be consumed cannot be reliably determined). Indefinite-lived intangible assets, excluding goodwill, consist of trade names associated with our aftermarket business. Impairment charges, if any, related to intangible assets are recorded as a separate charge included in income or loss from operations. In the first quarter of 2020 and fourth quarter of 2019, we recognized indefinite-lived intangible impairment charges of $11.0 million and $2.7 million, respectively, relating to trade names used in our European aftermarket busines
Foreign Currency Transactions and Translation	Foreign Currency Transactions and Translation The assets and liabilities of foreign subsidiaries that use local currency as their functional currency are translated to U.S. dollars based on the current exchange rate prevailing at each balance sheet date and any resulting translation adjustments are included in accumulated other comprehensive income or loss. The assets and liabilities of foreign subsidiaries whose local currency is not their functional currency are remeasured from their local currency to their functional currency and then translated to U.S. dollars. Revenues and expenses are translated into U.S. dollars using the average exchange rates prevailing for each period presented. Gains and losses arising from foreign currency transactions and the effects of remeasurement discussed in the preceding paragraph are recorded in other income or expense. We recognized foreign currency transaction gains (losses) of $(2.4) million and $0.5 million in 2020 and 2019, respectively.
Revenue Recognition	Revenue Recognition Revenue is recognized when performance obligations under our contracts are satisfied. Generally, this occurs upon shipment when control of products transfers to our customers. At this point, revenue is recognized in an amount reflecting the consideration we expect to be entitled to under the terms of our contract. The Company maintains long term business relationships with our OEM customers and aftermarket distributors; however, there are no definitive long-term volume commitments under these arrangements. Volume commitments are limited to near-term customer requirements authorized under purchase orders or production releases generally with delivery periods of approximately one month. Sales do not involve any significant financing component since customer payment is generally due 40-60 days after shipment. Contract assets and liabilities consist of customer receivables and deferred revenues related to tooling. At contract inception, the Company assesses goods and services promised in its contracts with customers and identifies a performance obligation for each promise to deliver a good or service (or bundle of goods or services) that is distinct. Principal performance obligations under our customer contracts consist of the manufacture and delivery of aluminum wheels, including production wheels, service wheels and replacement wheels. As a part of the manufacture of the wheels, we develop tooling necessary to produce the wheels. Accordingly, tooling costs, which are explicitly recoverable from our customers, are capitalized as preproduction costs and amortized to cost of sales over the average life of the vehicle wheel program. Similarly, customer reimbursement for tooling costs is deferred and amortized to net sales over the average life of the vehicle wheel program. In the normal course of business, the Company’s warranties are limited to product specifications and the Company does not accept product returns unless the item is defective as manufactured. Accordingly, warranty costs are treated as a cost of fulfillment subject to accrual, rather than a performance obligation. The Company establishes provisions for both estimated returns and warranties when revenue is recognized. In addition, the Company does not typically provide customers with the right to a refund but provides for product replacement. Prices allocated to production, service and replacement wheels are based on prices established in our customer purchase orders which represent the standalone selling price. Prices for service and replacement wheels are commensurate with production wheels with adjustment for any special packaging. In addition, prices are subject to adjustment for changes in commodity prices for certain raw materials, aluminum and silicon, as well as production efficiencies and wheel weight variations from specifications used in pricing. These price adjustments are treated as variable consideration. Customer tooling reimbursement is generally based on quoted prices or cost not to exceed quoted prices. We estimate variable consideration by using the “most likely” amount estimation approach. For commodity prices, initial estimates are based on the commodity index at contract inception. Changes in commodity prices are monitored and revenue is adjusted as changes in the commodity index occur. Prices incorporate the wheel weight price component based on product specifications. Weights are monitored, and prices are adjusted as variations arise. Price adjustments due to production efficiencies are generally recognized as and when negotiated with customers. Customer contract prices are generally adjusted quarterly to incorporate price adjustments. Under the Company’s policies, shipping costs are treated as a cost of fulfillment. In addition, the Company does not disclose remaining performance obligations under its contracts since contract terms are substantially less than a year (generally less than one month). Our revenue recognition practices and related transactions and balances are further described in Note 2, “Revenue.”
Stock-Based Compensation	Stock-Based Compensation We account for stock-based compensation using the estimated fair value recognition method. We recognize these compensation costs net of the applicable forfeiture rate on a straight-line basis for only those shares expected to vest over the requisite service period of the award, which is generally the vesting term of three years. We estimate the forfeiture rate based on our historical experience. Refer to Note 18, “Stock-Based Compensation” for additional information concerning our stock-based compensation awards.
Income Taxes	Income Taxes We account for income taxes using the asset and liability method. The asset and liability method requires the recognition of deferred tax assets and liabilities for expected future tax consequences of temporary differences that currently exist between the tax basis and financial reporting basis of our assets and liabilities. We calculate current and deferred tax provisions based on estimates and assumptions that could differ from actual results reflected on the income tax returns filed during the following years. Adjustments based on filed returns are recorded when identified in the subsequent years. The effect on deferred taxes for a change in tax rates is recognized in income in the period that the tax rate change is enacted. The ability to realize deferred tax assets depends on the ability to generate sufficient taxable income in the future. We account for uncertain tax positions utilizing a two-step approach to evaluate tax positions. Step one, recognition, requires evaluation of the tax position to determine if based solely on technical merits it is more likely than not to be sustained upon examination. Step two, measurement, is addressed only if a position is more likely than not to be sustained. In step two, the tax benefit is measured as the largest amount of benefit, determined on a cumulative probability basis, which is more likely than not to be realized upon ultimate settlement with tax authorities. If a position does not meet the more likely than not threshold for recognition in step one, no benefit is recorded until the first subsequent period in which the more likely than not standard is met, the issue is resolved with the taxing authority, or the statute of limitations expires. Positions previously recognized are derecognized when we subsequently determine the position no longer is more likely than not to be sustained. Evaluation of tax positions, their technical merits, and measurements using cumulative probability are highly subjective management estimates. Actual results could differ materially from these estimates. In 2020, we have provided deferred income taxes for the estimated U.S. federal and state income tax, foreign income tax and applicable withholding taxes on unremitted earnings of subsidiaries.
Cash Paid for Interest and Taxes and Non-Cash Investing Activities	Cash Paid for Interest and Taxes and Non-Cash Investing Activities Cash paid for interest was $39.6 million and $42.3 million, respectively, for the years ended December 31, 2020 and 2019. Cash paid for income taxes was $7.3 million and $9.0 million for the years ended December 31, 2020 and 2019, respectively. As of December 31, 2020 and 2019, we had purchased but not yet paid for equipment of $0.9 million and $15.6 million, respectively, which are included in accounts payable and accrued expenses in our consolidated balance sheets.
New Accounting Standards	New Accounting Standards Accounting Standards Update (“ASU”) 2018-13, “Fair Value Measurement .” Effective January 1, 2020, the Company adopted ASU 2018-13 which allows companies to remove, modify and add certain disclosures related to fair value measurements. The adoption of this standard did not have a significant effect on the Company’s consolidated financial statement disclosures. ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” ASU 2020-04 provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform, where certain criteria are met. These optional expedients and exceptions allow companies to elect not to apply certain accounting requirements under U.S. GAAP to contracts modified during the transition period (March 12, 2020 through December 31, 2022) due to reference rate reform. Companies exercising this election would account for a modified contract as a continuation of an existing contract. Companies are also permitted to continue to apply hedge accounting where the critical terms in a hedging relationship are modified due to reference rate reform, without de-designating and redesignating such hedges. In addition, companies may continue to assume that cash flows for hedged transactions and associated hedges affected by reference rate reform remain probable (as required for application of hedge accounting), despite the planned discontinuance of such reference rates. The Company uses LIBOR as the benchmark interest rate in its $400.0 million senior secured term loan facility (“Term Loan Facility”), $160.0 million revolving credit facility (“Revolving Credit Facility”), $65.0 million North American receivables factoring arrangement and interest rate swaps with a notional value of $200.0 million as of December 31, 2020 used to hedge interest rate fluctuations on our variable rate borrowings under the Term Loan Facility (refer to Note 4, “Derivative Financial Instruments,” Note 10, “Debt, ” and Note 20, “Receivables Factoring”). In 2020, the Company has adopted ASU 2020-04 an d will apply optional expedients and exceptions prospectively as we modify affected contracts during the transition period. The adoption of this guidance has not had, and is not expected to have, any significant effect on the Company’s consolidated financial statements. ASU 2018-14,“Compensation - Retirement Benefits - Defined Benefit Plans.” The Company has adopted ASU 2018-14, which is designed to improve the effectiveness of disclosures by removing and adding disclosures related to defined benefit plans for the fiscal year ended December 31, 2020. We have incorporated disclosures required under this ASU relating to the nature and reason for any significant actuarial gains and losses (refer to Note 16, “Retirement Plans”). The adoption of this standard did not have any significant effect on the Company’s consolidated financial statement disclosures. Accounting Standards Issued But Not Yet Adopted ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13 which requires entities to use a new impairment model based on current expected credit losses (“CECL”) rather than incurred losses. Under CECL, estimated credit losses would incorporate relevant information about past events, current conditions and reasonable and supportable forecasts and any expected credit losses would be recognized at the time of sale. As a smaller reporting company (as defined under SEC regulations), the Company is not required to adopt the standard until fiscal years beginning after December 31, 2022. We are evaluating the impact this standard will have on our financial statements and disclosures.
Fair Value Measurements	The Company applies fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are required to be 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 when we have 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	Derivative Instruments and Hedging Activities We use derivatives to partially offset our exposure to foreign currency, interest rate, aluminum and other commodity 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 offset more than a portion of the financial impact resulting from movements in foreign currency exchange rates, interest rates, and aluminum and natural gas commodity prices. To help protect gross margins from fluctuations 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.
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Estimated Useful Lives of the Assets	Classification Expected Useful Life Buildings 15 to 50 years Machinery and equipment 3 to 20 years Leasehold Improvements Lease term

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Summary of Opening and Closing Balances of Company's Receivables and Current and Long-term Contract Liabilities	The opening and closing balances of the Company’s receivables and current and long-term contract liabilities are as follows: December 31, 2020 December 31, 2019 Change (Dollars in thousands) Customer receivables $ 40,785 $ 68,283 $ (27,498 ) Contract liabilities—current 8,249 5,880 2,369 Contract liabilities—noncurrent 13,106 13,577 (471 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Summary of Items Measured at Fair Value	The following tables categorize items measured at fair value at December 31, 2020 and 2019: Fair Value Measurement at Reporting Date Using December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (Dollars in thousands) Assets Derivative contracts $ 10,218 $ — $ 10,218 $ — Total $ 10,218 $ — $ 10,218 $ — Liabilities . Derivative contracts $ 15,259 $ — $ 15,259 $ — Total $ 15,259 $ — $ 15,259 $ — Fair Value Measurement at Reporting Date Using December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (Dollars in thousands) Assets Derivative contracts $ 21,973 $ — $ 21,973 $ — Total $ 21,973 $ — $ 21,973 $ — Liabilities Derivative contracts $ 8,709 $ — $ 8,709 $ — Total $ 8,709 $ — $ 8,709 $ —
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The estimated fair value, as well as the carrying value, of the Company’s debt instruments are shown below (in thousands): December 31, 2020 December 31, 2019 (Dollars in thousands) Estimated aggregate fair value $ 624,207 $ 606,093 Aggregate carrying value (1) 643,184 630,635 (1) Total debt excluding the impact of unamortized debt issuance costs.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Fair Value of Derivatives by Balance Sheet Line Item	The following tables display the fair value of derivatives by balance sheet line item at December 31, 2020 and December 31, 2019: December 31, 2020 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts designated as hedging instruments $ 1,218 $ 6,531 $ 3,435 $ 2,645 Foreign exchange forward contracts not designated as hedging instruments 1,167 — 122 — Aluminum forward contracts designated as hedging instruments 262 — — — Natural gas forward contracts designated as hedging instruments 816 224 22 70 Interest rate swap contracts designated as hedging instruments — — 4,771 4,194 Total derivative financial instruments $ 3,463 $ 6,755 $ 8,350 $ 6,909 December 31, 2019 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts designated as hedging instruments $ 7,808 $ 12,821 $ 60 $ 100 Foreign exchange forward contracts not designated as hedging instruments 1,196 — 554 — Aluminum forward contracts designated as hedging instruments 60 — 127 — Natural gas forward contracts designated as hedging instruments 81 7 1,312 727 Interest rate swap contracts designated as hedging instruments — — 2,304 3,525 Total derivative financial instruments $ 9,145 $ 12,828 $ 4,357 $ 4,352
Summary of Notional Amount and Estimated Fair Value of Derivative Financial Instruments	The following table summarizes the notional amount and estimated fair value of our derivative financial instruments: December 31, 2020 December 31, 2019 Notional U.S. Dollar Amount Fair Value Notional U.S. Dollar Amount Fair Value (Dollars in thousands) Foreign exchange forward contracts designated as hedging instruments $ 421,253 $ 1,669 $ 449,181 $ 20,469 Foreign exchange forward contracts not designated as hedging instruments 71,217 1,045 73,491 642 Aluminum forward contracts designated as hedging instruments 4,068 262 9,405 (67 ) Natural gas forward contracts designated as hedging instruments 5,523 948 5,816 (1,951 ) Interest rate swap contracts designated as hedging instruments 200,000 (8,965 ) 260,000 (5,829 ) Total derivative financial instruments $ 702,061 $ (5,041 ) $ 797,893 $ 13,264
Summary of Gain or Loss Recognized in Accumulated Other Comprehensive Income or Loss	The following tables summarize the gain or loss recognized in accumulated other comprehensive income or loss (“AOCI”) for the years ended December 31, 2020 and 2019, the amounts reclassified from AOCI into earnings and the amounts recognized directly into earnings for the years ended December 31, 2020 and 2019: Year Ended December 31, 2020 Amount of Gain or (Loss) Recognized in AOCI on Derivatives Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Dollars in thousands) Derivative Contracts $ (11,689 ) $ (8,365 ) $ 2,098 Total $ (11,689 ) $ (8,365 ) $ 2,098 Year Ended December 31, 2019 Amount of Gain or (Loss) Recognized in AOCI on Derivatives Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Dollars in thousands) Derivative Contracts $ 13,156 $ 3,746 $ 4,320 Total $ 13,156 $ 3,746 $ 4,320

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Summary of Net Sales and Results of Operations and Total Assets by Reportable Segment	Net Sales Income (Loss) from Operations Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) North America $ 550,079 $ 704,320 $ 8,872 $ 16,713 Europe 550,681 668,167 (189,307 ) (66,772 ) $ 1,100,760 $ 1,372,487 $ (180,435 ) $ (50,059 ) Depreciation and Amortization Capital Expenditures Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) North America $ 34,935 $ 38,845 $ 24,929 $ 22,464 Europe 63,243 61,877 20,109 41,830 $ 98,178 $ 100,722 $ 45,038 $ 64,294 Property, Plant and Equipment, net Goodwill and Intangible Assets Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) North America $ 220,145 $ 237,372 $ — $ — Europe 301,979 291,910 110,796 321,910 $ 522,124 $ 529,282 $ 110,796 $ 321,910 Total Assets Year Ended December 31, 2020 2019 (Dollars in thousands) North America $ 479,873 $ 484,689 Europe 629,452 827,178 $ 1,109,325 $ 1,311,867 See table below for our net sales and long-lived assets by location: Net Sales Property, Plant and Equipment, net Year Ended December 31, 2020 2019 2020 2019 (Dollars in thousands) U.S. $ 27,919 $ 104,476 $ 7,324 $ 14,146 Mexico 522,160 599,844 212,821 223,226 Germany 212,689 245,805 82,162 74,030 Poland 337,992 422,362 219,817 217,880 $ 1,100,760 $ 1,372,487 $ 522,124 $ 529,282

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Summary of Accounts Receivable	Year Ended December 31, 2020 2019 (Dollars in thousands) Trade receivables $ 41,647 $ 71,150 Other receivables 8,211 8,503 49,858 79,653 Allowance for doubtful accounts (863 ) (2,867 ) Accounts receivable, net $ 48,995 $ 76,786
Schedule of Revenues by Major Customers	2020 Percent of Sales 2019 Percent of Sales GM 24 % 22 % VW Group 16 % 13 % Ford 11 % 15 %

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Summary of Inventories	Year Ended December 31, 2020 2019 (Dollars in thousands) Raw materials $ 46,712 $ 44,245 Work in process 45,394 40,344 Finished goods 62,874 83,881 Inventories, net $ 154,980 $ 168,470

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Schedule of Property, Plant and Equipment	Year Ended December 31, 2020 2019 (Dollars in thousands) Land and buildings $ 149,295 $ 158,907 Machinery and equipment 899,764 856,961 Leasehold improvements and others 14,912 12,173 Construction in progress 46,718 30,179 1,110,689 1,058,220 Accumulated depreciation (588,565 ) (528,938 ) Property, plant and equipment, net $ 522,124 $ 529,282

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Finite-Lived and Indefinite-Lived Intangible Assets	Following is a summary of the Company’s finite-lived and indefinite-lived intangible assets and goodwill as of December 31, 2020 and 2019. Year Ended December 31, 2020 Gross Carrying Amount Impairment Accumulated Amortization Currency Translation Net Carrying Amount Remaining Weighted Average Amortization Period (Dollars in thousands) Brand name $ 9,000 $ — $ (6,615 ) $ 399 $ 2,784 2-3 Technology 15,000 — (11,024 ) 666 4,642 1-3 Customer relationships 167,000 — (74,322 ) 10,692 103,370 3-8 Total finite 191,000 — (91,961 ) 11,757 110,796 Trade names 14,000 (13,772 ) — (228 ) — Indefinite Total intangibles $ 205,000 $ (13,772 ) $ (91,961 ) $ 11,529 $ 110,796 Year Ended December 31, 2020 Beginning Balance Ending Balance Gross Accumulated Impairment Net Balance Impairment Currency Translation Gross Accumulated Impairment Net Balance (Dollars in thousands) Goodwill $ 284,337 $ (99,505 ) $ 184,832 $ (182,602 ) $ (2,230 ) $ 282,107 $ (282,107 ) $ — Year Ended December 31, 2019 Gross Carrying Amount Impairment Accumulated Amortization Currency Translation Net Carrying Amount Remaining Weighted Average Amortization Period (Dollars in thousands) Brand name $ 9,000 $ — $ (4,778 ) $ 110 $ 4,332 3-4 Technology 15,000 — (7,963 ) 183 7,220 2-4 Customer relationships 167,000 — (53,681 ) 954 114,273 4-9 Total finite 191,000 — (66,422 ) 1,247 125,825 Trade names 14,000 (2,733 ) — (14 ) 11,253 Indefinite Total intangibles $ 205,000 $ (2,733 ) $ (66,422 ) $ 1,233 $ 137,078 Year Ended December 31, 2019 Beginning Balance Ending Balance Gross Accumulated Impairment Net Balance Impairment Currency Translation Gross Accumulated Impairment Net Balance (Dollars in thousands) Goodwill $ 291,434 $ — $ 291,434 $ (99,505 ) $ (7,097 ) $ 284,337 $ (99,505 ) $ 184,832

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Summary of Long-Term Debt and Related Weighted Average Interest Rates	A summary of long-term debt and the related weighted average interest rates is shown below: December 31, 2020 (Dollars in Thousands) Debt Instrument Total Debt Debt Issuance Costs (1) Total Debt, Net Weighted Average Interest Rate Term Loan Facility $ 349,200 $ (7,155 ) $ 342,045 4.1 % 6.00% Senior Notes 266,928 (4,425 ) 262,503 6.0 % European CapEx Loans 23,668 — 23,668 2.3 % Finance Leases 3,388 — 3,388 3.0 % $ 643,184 $ (11,580 ) 631,604 Less: Current portion (6,112 ) Long-term debt $ 625,492 December 31, 2019 (Dollars in Thousands) Debt Instrument Total Debt Debt Issuance Costs (1) Total Debt, Net Weighted Average Interest Rate Term Loan Facility $ 371,800 $ (10,192 ) $ 361,608 5.7 % 6.00% Senior Notes 243,074 (5,408 ) 237,666 6.0 % European CapEx Loan 12,693 — 12,693 2.2 % Finance Leases 3,068 — 3,068 2.9 % $ 630,635 $ (15,600 ) 615,035 Less: Current portion (4,010 ) Long-term debt $ 611,025 (1) Unamortized portion
Schedule of Debt Maturities	Debt maturities due in the next five years and thereafter are as follows: Year Ended December 31, (Dollars in thousands) Debt Maturities Amount 2021 $ 6,112 2022 6,575 2023 6,083 2024 352,422 2025 269,326 Thereafter 2,666 Total debt liabilities $ 643,184

European Non-Controlling Rede_2

European Non-Controlling Redeemable Equity (Tables)	12 Months Ended
	Dec. 31, 2020
Noncontrolling Interest [Abstract]
Summary of Redeemable Noncontrolling Interests	The following table summarizes the European non-controlling redeemable equity activity for the two year period ended December 31, 2020: (Dollars in thousands) Balance at December 31, 2018 $ 13,849 Dividends accrued 566 Dividends paid (848 ) Translation adjustment (361 ) Purchase of shares (6,681 ) Balance at December 31, 2019 6,525 Dividends accrued 205 Dividends paid (46 ) Translation adjustment 2 Purchase of shares (5,020 ) Balance at December 31, 2020 $ 1,666

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Year Ended December 31, 2020 2019 (Dollars in thousands, except per share amounts) Basic Earnings Per Share: Net loss $ (243,561 ) $ (96,460 ) Less: Redeemable preferred stock dividends and accretion (31,994 ) (30,977 ) Less: European non-controlling redeemable equity dividend (205 ) (566 ) Basic numerator $ (275,760 ) $ (128,003 ) Basic loss per share $ (10.81 ) $ (5.10 ) Weighted average shares outstanding – Basic 25,498 25,099 Diluted Earnings Per Share: Net loss $ (243,561 ) $ (96,460 ) Less: Redeemable preferred stock dividends and accretion (31,994 ) (30,977 ) Less: European non-controlling redeemable equity dividend (205 ) (566 ) Diluted numerator $ (275,760 ) $ (128,003 ) Diluted loss per share $ (10.81 ) $ (5.10 ) Weighted average shares outstanding – Basic 25,498 25,099 Dilutive effect of common share equivalents — — Weighted average shares outstanding – Diluted 25,498 25,099

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income (Loss) Before Income Taxes From Domestic and International Jurisdictions	Income/(loss) before income taxes from domestic and international jurisdictions is comprised of the following: Year Ended December 31, 2020 2019 (Dollars in thousands) Income (loss) before income taxes: Domestic $ (74,151 ) $ (60,170 ) Foreign (154,529 ) (32,867 ) $ (228,680 ) $ (93,037 )
Benefit (Provision) for Income Taxes	The benefit/(provision) for income taxes is comprised of the following: Year Ended December 31, 2020 2019 (Dollars in thousands) Current taxes Federal $ 1,970 $ 3,834 State (29 ) (146 ) Foreign (9,333 ) (10,615 ) Total current taxes (7,392 ) (6,927 ) Deferred taxes Federal (4,756 ) (3,174 ) State (3,622 ) 1,014 Foreign 889 5,664 Total deferred taxes (7,489 ) 3,504 Income tax benefit (provision) $ (14,881 ) $ (3,423 )
Reconciliation of the U.S. Federal Tax Rate	The following is a reconciliation of the U.S. federal tax rate to our effective income tax rate: Year Ended December 31, 2020 2019 Statutory rate 21.0 % 21.0 % State tax provisions, net of federal income tax benefit 0.6 2.7 Tax credits (0.1 ) 6.6 Foreign income taxes at rates other than the statutory rate 10.9 17.7 Valuation allowance (10.4 ) (6.9 ) Changes in tax liabilities, net (0.2 ) (0.3 ) Share based compensation (0.2 ) (1.8 ) Unremitted non-U.S. Earnings (1.7 ) — US Tax on non-US income 0.8 (6.7 ) Non taxable income — 2.4 Impairment of Goodwill (25.3 ) (34.0 ) Other (1.9 ) (4.4 ) Effective income tax rate (6.5 )% (3.7 )%
Summary of Deferred Income Tax Assets and Liabilities	Tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows: Year Ended December 31, 2020 2019 (Dollars in thousands) Deferred income tax assets: Accrued liabilities $ 3,688 $ 4,695 Hedging and foreign currency gains (losses) 3,323 2,386 Deferred compensation 8,473 8,018 Inventory reserves 5,114 4,609 Net loss carryforwards and credits 48,924 38,342 Interest carryforwards 14,972 19,632 Competent authority deferred tax assets and other foreign timing differences 4,465 3,954 Other 1,714 782 Total before valuation allowance 90,673 82,418 Valuation allowance (46,490 ) (22,879 ) Net deferred income tax assets 44,183 59,539 Deferred income tax liabilities: Intangibles, property, plant and equipment and other (17,959 ) (33,301 ) Unremitted earnings (4,468 ) — Deferred income tax liabilities (22,427 ) (33,301 ) Net deferred income tax assets $ 21,756 $ 26,238 The classification of our net deferred tax asset is shown below: Year Ended December 31, 2020 2019 (Dollars in thousands) Long-term deferred income tax assets $ 30,860 $ 38,607 Long-term deferred income tax liabilities (9,104 ) (12,369 ) Net deferred tax asset $ 21,756 $ 26,238
Schedule of Unrecognized Tax Benefits Roll Forward	Year Ended December 31, 2020 2019 (Dollars in thousands) Beginning balance $ 30,368 $ 31,036 Increases (decreases) due to foreign currency translations $ 2,265 (632 ) Increases (decreases) as a result of positions taken during: Prior periods (1,147 ) (36 ) Current period 372 — Expiration of applicable statutes of limitation — — Ending balance (1) $ 31,858 $ 30,368

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Lease Expense, Cash Flow, Operating and Finance Lease Assets and Liabilities, Average Lease Term and Average Discount Rate	Lease expense, cash flow, operating and finance lease assets and liabilities, average lease term and average discount rate are as follows: Year Ended December 31, 2020 2019 (Dollars in thousands) Lease Expense Finance lease expense: Amortization of right-of-use assets $ 1,219 $ 1,691 Interest on lease liabilities 85 83 Operating lease expense 3,388 3,509 Total lease expense $ 4,692 $ 5,283 Cash Flow Components Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from finance leases $ 85 $ 83 Operating cash outflows from operating leases 3,621 3,463 Financing cash outflows from finance leases 960 1,230 Right-of-use assets obtained in exchange for finance lease liabilities, net of terminations and disposals 879 2,573 Right-of-use assets obtained in exchange for operating lease liabilities, net of terminations and disposals 657 18,961 Year Ended December 31, 2020 2019 (Dollars in thousands, except lease term and discount rate) Balance Sheet Information Operating leases: Other non-current assets $ 13,598 $ 15,201 Accrued liabilities $ (2,868 ) $ (2,949 ) Other non-current liabilities (11,513 ) (13,282 ) Total operating lease liabilities $ (14,381 ) $ (16,231 ) Finance leases: Property, plant and equipment gross $ 5,735 $ 4,821 Accumulated depreciation (3,319 ) (2,118 ) Property, plant and equipment, net $ 2,416 $ 2,703 Current portion of long-term debt $ (1,113 ) $ (1,023 ) Long-term debt (less current portion) (2,275 ) (2,045 ) Total finance lease liabilities $ (3,388 ) $ (3,068 ) Lease Term and Discount Rates Weighted-average remaining lease term - finance leases (years) 3.9 4.1 Weighted-average remaining lease term - operating leases (years) 6.1 6.4 Weighted-average discount rate - finance leases 3.0 % 2.9 % Weighted-average discount rate - operating leases 3.8 % 3.9 %
Schedule of Future Minimum Rental Payments Under Finance and Operating Leases	Summarized future minimum payments under our leases are as follows: Year Ended December 31, Amount (Dollars in thousands) Lease Maturities Finance Leases Operating Leases 2021 $ 1,186 $ 2,879 2022 1,080 2,870 2023 568 2,499 2024 160 2,279 2025 152 2,229 Thereafter 425 3,163 Total 3,571 15,919 Less: Imputed interest (183 ) (1,538 ) Total lease liabilities, net of interest $ 3,388 $ 14,381

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Summary of Changes in Plan Assets and Plan Benefit Obligations	The following table summarizes the changes in plan assets and plan benefit obligations. Year Ended December 31, 2020 2019 (Dollars in thousands) Change in benefit obligation Beginning benefit obligation $ 31,001 $ 26,953 Interest cost 1,005 1,144 Actuarial loss 2,164 4,295 Benefit payments (1,530 ) (1,391 ) Ending benefit obligation $ 32,640 $ 31,001
Summary of Defined Benefit Plans	Year Ended December 31, 2020 2019 (Dollars in thousands) Change in plan assets Fair value of plan assets at beginning of year $ — $ — Employer contribution 1,475 1,391 Benefit payments (1,475 ) (1,391 ) Fair value of plan assets at end of year $ — $ — Funded status $ (32,640 ) $ (31,001 ) Amounts recognized in the consolidated balance sheets consist of: Accrued expenses $ (1,447 ) $ (1,478 ) Other non-current liabilities (31,193 ) (29,523 ) Net amount recognized $ (32,640 ) $ (31,001 ) Amounts recognized in accumulated other comprehensive loss consist of: Net actuarial loss $ 10,760 $ 8,940 Prior service cost (1 ) (1 ) Net amount recognized, before tax effect $ 10,759 $ 8,939 Weighted average assumptions used to determine benefit obligations: Discount rate 2.6 % 3.3 % Rate of compensation increase 3.0 % 3.0 %
Summary of Components of Net Periodic Pension Cost	Components of net periodic pension cost are described in the following table: Year Ended December 31, 2020 2019 (Dollars in thousands) Components of net periodic pension cost: Interest cost $ 1,005 $ 1,144 Amortization of actuarial loss 288 209 Net periodic pension cost $ 1,293 $ 1,353 Weighted average assumptions used to determine net periodic pension cost: Discount rate 3.3 % 4.4 % Rate of compensation increase 3.0 % 3.0 %
Summary of Expected Benefit Payments	Benefit payments during the next ten years, which reflect applicable future service, are as follows: Year Ended December 31, Amount (Dollars in thousands) 2021 $ 1,465 2022 1,510 2023 1,492 2024 1,533 2025 1,739 Years 2026 to 2030 8,815
Periodic Pension Cost, Next Fiscal Year	The following is an estimate of the components of net periodic pension cost in 2021: Estimated Year Ended December 31, 2021 (Dollars in thousands) Interest cost $ 823 Amortization of actuarial loss 387 Estimated 2021 net periodic pension cost $ 1,210

Accrued Expenses (Tables)

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Schedule of Accrued Liabilities	Year Ended December 31, 2020 2019 (Dollars in thousands) Payroll and related benefits $ 26,930 $ 25,048 Taxes, other than income taxes 14,502 12,096 Current portion of derivative liability 8,350 4,357 Deferred tooling revenue 8,249 5,880 Short-term operating lease liability 2,868 2,949 Dividends and interest 1,453 1,247 Current portion of executive retirement liabilities 1,447 1,478 Professional fees 1,102 2,216 Other 6,178 5,574 Accrued liabilities $ 71,079 $ 60,845

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Restricted Stock Unit and Restricted Performance Stock Unit Activity	Equity Incentive Awards Restricted Stock Units Weighted Average Grant Date Fair Value Performance Shares Weighted Average Grant Date Fair Value Options Weighted Average Exercise Price Balance at December 31, 2019 1,047,256 $ 5.39 1,548,793 $ 7.17 50,250 $ 18.86 Granted 763,674 2.64 1,207,351 2.95 — — Settled (401,723 ) 6.14 (245,713 ) 5.05 — — Forfeited or expired (195,540 ) 4.27 (334,141 ) 7.44 (26,250 ) 17.46 Balance at December 31, 2020 1,213,667 $ 3.59 2,176,290 $ 4.88 24,000 $ 20.39 Vested or expected to vest at December 31, 2020 1,118,978 $ 3.59 430,624 $ 6.99 24,000 $ 20.39

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 22, 2017USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Goodwill impairment charges			$ 182,602,000	$ 99,505,000
Goodwill		$ 184,832,000	0	184,832,000	$ 291,434,000
Indefinite-lived intangible impairment charge			(13,772,000)	(2,733,000)
Indefinite-lived intangible asset		11,253,000	0	11,253,000
Recognized foreign currency transaction gain (loss), before tax			(2,400,000)	500,000
Cash paid for interest			39,600,000	42,300,000
Cash paid for income taxes			7,300,000	9,000,000
Noncash or part noncash acquisition, fixed assets acquired			900,000	$ 15,600,000
Interest rate swaps with a notional value			200,000,000
North American [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Receivables from factoring arrangement			65,000,000
Senior Secured Term Loan Facility [Member] | Senior Notes [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Amount of term loan facility			400,000,000			$ 400,000,000
Revolving Credit Facility [Member] | Senior Secured Term Loan Facility [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Amount of term loan facility						$ 160,000,000
Revolving Credit Facility [Member] | Senior Secured Term Loan Facility [Member] | North American [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Amount of term loan facility			$ 160,000,000
Trade Names [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Indefinite-lived intangible impairment charge	$ 11,000,000	2,700,000
European Operations [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Goodwill impairment charges	$ 182,600,000	$ 99,500,000
Supplier Concentration Risk [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Vendors accounting for more than ten percent of aluminum purchases			3	4
Concentration risk percentage			55.00%	62.90%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of the Assets. (Detail)	12 Months Ended
	Dec. 31, 2020
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	15 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Lease term
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	50 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	20 years

Revenue - Summary of Opening an

Revenue - Summary of Opening and Closing Balances of Company's Receivables and Current and Long-term Contract Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer receivables	$ 40,785	$ 68,283
Contract liabilities—current	8,249	5,880
Contract liabilities—noncurrent	13,106	$ 13,577
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer receivables	(27,498)
Contract liabilities—current	2,369
Contract liabilities—noncurrent	$ (471)

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Tooling Reimbursement [Member]
Revenue From Contract With Customers [Line Items]
Deferred revenue, revenue recognized	$ 13.1	$ 10.7
Price Adjustments [Member]
Revenue From Contract With Customers [Line Items]
Deferred revenue, revenue recognized	$ 0.7	$ 1.7

Fair Value Measurements - Recur

Fair Value Measurements - Recurring (Detail) - Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Derivative contracts	$ 10,218	$ 21,973
Total	10,218	21,973
Liabilities
Derivative contracts	15,259	8,709
Total	15,259	8,709
Level 2 [Member]
Assets
Derivative contracts	10,218	21,973
Total	10,218	21,973
Liabilities
Derivative contracts	15,259	8,709
Total	$ 15,259	$ 8,709

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative Instrument Detail [Abstract]
Estimated aggregate fair value	$ 624,207	$ 606,093
Aggregate carrying value	$ 643,184	$ 630,635

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative instruments objectives	We use derivatives to partially offset our exposure to foreign currency, interest rate, aluminum and other commodity 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.
Maximum length of time, foreign currency cash flow hedge	48 months

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Fair Value of Derivatives by Balance Sheet Line Item (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 3,463	$ 9,145
Other Non-current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	6,755	12,828
Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	8,350	4,357
Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	6,909	4,352
Designated as Hedging Instrument [Member] | Natural Gas [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	816	81
Designated as Hedging Instrument [Member] | Natural Gas [Member] | Other Non-current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	224	7
Designated as Hedging Instrument [Member] | Natural Gas [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	22	1,312
Designated as Hedging Instrument [Member] | Natural Gas [Member] | Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	70	727
Foreign Exchange Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1,218	7,808
Foreign Exchange Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Non-current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	6,531	12,821
Foreign Exchange Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	3,435	60
Foreign Exchange Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	2,645	100
Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1,167	1,196
Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	122	554
Aluminum Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	262	60
Aluminum Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities		127
Interest Rate Swap Contracts Designated as Hedges [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	4,771	2,304
Interest Rate Swap Contracts Designated as Hedges [Member] | Designated as Hedging Instrument [Member] | Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 4,194	$ 3,525

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Notional Amount and Estimated Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	$ 702,061	$ 797,893
Derivative, Fair Value, Net	(5,041)	13,264
Designated as Hedging Instrument [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	5,523	5,816
Derivative, Fair Value, Net	948	(1,951)
Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	421,253	449,181
Derivative, Fair Value, Net	1,669	20,469
Designated as Hedging Instrument [Member] | Aluminum Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	4,068	9,405
Derivative, Fair Value, Net	262	(67)
Designated as Hedging Instrument [Member] | Interest Rate Swap Contracts Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	200,000	260,000
Derivative, Fair Value, Net	(8,965)	(5,829)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	71,217	73,491
Derivative, Fair Value, Net	$ 1,045	$ 642

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Gain or Loss Recognized in Accumulated Other Comprehensive Income or Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives	$ (11,689)	$ 13,156
Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income	(8,365)	3,746
Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives	2,098	4,320
Derivative [Member]
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives	(11,689)	13,156
Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income	(8,365)	3,746
Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives	$ 2,098	$ 4,320

Business Segments - Summary of

Business Segments - Summary of Net Sales and Results of Operations and Total Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 1,100,760	$ 1,372,487
Income (Loss) from Operations	(180,435)	(50,059)
Depreciation and Amortization	98,178	100,722
Capital Expenditures	45,038	64,294
Property, Plant and Equipment, net	522,124	529,282
Goodwill and Intangible Assets	110,796	321,910
Total assets	1,109,325	1,311,867
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	550,079	704,320
Income (Loss) from Operations	8,872	16,713
Depreciation and Amortization	34,935	38,845
Capital Expenditures	24,929	22,464
Property, Plant and Equipment, net	220,145	237,372
Total assets	479,873	484,689
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	550,681	668,167
Income (Loss) from Operations	(189,307)	(66,772)
Depreciation and Amortization	63,243	61,877
Capital Expenditures	20,109	41,830
Property, Plant and Equipment, net	301,979	291,910
Goodwill and Intangible Assets	110,796	321,910
Total assets	$ 629,452	$ 827,178

Business Segments - Net Sales a

Business Segments - Net Sales and Long-Lived Assets by Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 1,100,760	$ 1,372,487
Property, Plant and Equipment, net	522,124	529,282
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	27,919	104,476
Property, Plant and Equipment, net	7,324	14,146
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	522,160	599,844
Property, Plant and Equipment, net	212,821	223,226
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	212,689	245,805
Property, Plant and Equipment, net	82,162	74,030
Poland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	337,992	422,362
Property, Plant and Equipment, net	$ 219,817	$ 217,880

Accounts Receivable - Summary o

Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Trade receivables	$ 41,647	$ 71,150
Other receivables	8,211	8,503
Accounts receivable, gross	49,858	79,653
Allowance for doubtful accounts	(863)	(2,867)
Accounts receivable, net	$ 48,995	$ 76,786

Accounts Receivable - Additiona

Accounts Receivable - Additional Information (Detail) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
General Motors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	24.00%	22.00%
General Motors [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	11.00%	32.00%
Volkswagen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	16.00%	13.00%
Volkswagen [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	5.00%	9.00%
Ford [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	11.00%	15.00%
Ford [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	3.00%	8.00%

Accounts Receivable - Schedule

Accounts Receivable - Schedule of Revenues by Major Customers (Detail) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
General Motors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	24.00%	22.00%
Volkswagen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	16.00%	13.00%
Ford [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	11.00%	15.00%

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 46,712	$ 44,245
Work in process	45,394	40,344
Finished goods	62,874	83,881
Inventories, net	$ 154,980	$ 168,470

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Inventory, non-current	$ 12.1	$ 10.6

Property, Plant and Equipment -

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,110,689	$ 1,058,220
Accumulated depreciation	(588,565)	(528,938)
Property, plant and equipment, net	522,124	529,282
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	149,295	158,907
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	899,764	856,961
Leasehold Improvements and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,912	12,173
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 46,718	$ 30,179

Property, Plant and Equipment_2

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 72.8	$ 75.8
Fayetteville, Arkansas Manufacturing Facility [Member]
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 7.6		$ 7.6

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charge recognized			$ (13,772)	$ (2,733)
Impairment charges	$ 193,600			102,200
Weighted income approach to determine the fair value of the company's reporting units	75.00%
Weighted market approach to determine the fair value of the company's reporting units	25.00%
Amortization of intangible assets			25,400	$ 25,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021			27,400
2022			24,300
2023			22,100
2024			22,100
2025			$ 10,900
Market Approach Valuation Technique [Member]
Finite-Lived Intangible Assets [Line Items]
Fair value measurements valuation process multiple used	4.9X EBITDA			5.7X EBITDA
Measurement Input, Discount Rate [Member]
Finite-Lived Intangible Assets [Line Items]
Discount rate	12.00%			10.00%
Measurement Input, Long-term Revenue Growth Rate [Member]
Finite-Lived Intangible Assets [Line Items]
Long-term growth rate	1.50%			2.00%
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charge recognized	$ 11,000	$ 2,700
European Operations [Member]
Finite-Lived Intangible Assets [Line Items]
Amount of fair value in excess of carrying value	$ 182,600

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Summary of Finite-Lived and Indefinite-Lived Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Gross Carrying Amount	$ 191,000,000	$ 191,000,000
Accumulated Amortization	(91,961,000)	(66,422,000)
Finite-lived Intangible Assets, Currency Translation	11,757,000	1,247,000
Finite lived Intangible Assets, Net	110,796,000	125,825,000
Indefinite lived Intangible Assets, Gross Carrying Amount	14,000,000	14,000,000
Indefinite lived Intangible Assets, Gross Carrying Amount, Impairment	13,772,000	2,733,000
Indefinite lived Intangible Assets, Currency Translation	(228,000)	(14,000)
Indefinite lived Intangible Assets, Net	0	11,253,000
Gross Carrying Amount	205,000,000	205,000,000
Impairment	(13,772,000)	(2,733,000)
Currency Translation	11,529,000	1,233,000
Intangibles, net	110,796,000	137,078,000
Goodwill Gross, Beginning Balance	284,337,000	291,434,000
Goodwill Accumulated Impairment, Beginning Balance	(99,505,000)
Goodwill Net Balance,Beginning Balance	184,832,000	291,434,000
Goodwill, Impairment	(182,602,000)	(99,505,000)
Goodwill, Currency Translation	(2,230,000)	(7,097,000)
Goodwill Gross, Ending Balance	282,107,000	284,337,000
Goodwill Accumulated Impairment, Ending Balance	(282,107,000)	(99,505,000)
Goodwill, Ending Balance	0	184,832,000
Brand Name [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Gross Carrying Amount	9,000,000	9,000,000
Accumulated Amortization	(6,615,000)	(4,778,000)
Finite-lived Intangible Assets, Currency Translation	399,000	110,000
Finite lived Intangible Assets, Net	$ 2,784,000	$ 4,332,000
Brand Name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	2 years	3 years
Brand Name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	3 years	4 years
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Gross Carrying Amount	$ 15,000,000	$ 15,000,000
Accumulated Amortization	(11,024,000)	(7,963,000)
Finite-lived Intangible Assets, Currency Translation	666,000	183,000
Finite lived Intangible Assets, Net	$ 4,642,000	$ 7,220,000
Technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	1 year	2 years
Technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	3 years	4 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Gross Carrying Amount	$ 167,000,000	$ 167,000,000
Accumulated Amortization	(74,322,000)	(53,681,000)
Finite-lived Intangible Assets, Currency Translation	10,692,000	954,000
Finite lived Intangible Assets, Net	$ 103,370,000	$ 114,273,000
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	3 years	4 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period	8 years	9 years

Debt - Summary of Long-Term Deb

Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Debt	$ 643,184	$ 630,635
Debt Issuance Costs	(11,580)	(15,600)
Total Debt, Net	631,604	615,035
Less: Current portion	(6,112)	(4,010)
Long-term debt	625,492	611,025
Term Loan Facility [Member]
Debt Instrument [Line Items]
Total Debt	349,200	371,800
Debt Issuance Costs	(7,155)	(10,192)
Total Debt, Net	$ 342,045	$ 361,608
Weighted Average Interest Rate	4.10%	5.70%
Senior Notes [Member] | 6.00% Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	$ 266,928	$ 243,074
Debt Issuance Costs	(4,425)	(5,408)
Total Debt, Net	$ 262,503	$ 237,666
Weighted Average Interest Rate	6.00%	6.00%
European CapEx Loans [Member]
Debt Instrument [Line Items]
Total Debt	$ 23,668	$ 12,693
Total Debt, Net	$ 23,668	$ 12,693
Weighted Average Interest Rate	2.30%	2.20%
Finance Leases [Member]
Debt Instrument [Line Items]
Total Debt	$ 3,388	$ 3,068
Total Debt, Net	$ 3,388	$ 3,068
Weighted Average Interest Rate	3.00%	2.90%

Debt - Summary of Long-Term D_2

Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Parenthetical) (Detail)	Dec. 31, 2020	Dec. 31, 2019
6.00% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated, percentage	6.00%	6.00%

Debt - Additional Information (

Debt - Additional Information (Detail)

Jun. 15, 2017EUR (€)

Mar. 22, 2017USD ($)

Jun. 30, 2021USD ($)

Jun. 30, 2021EUR (€)

Sep. 30, 2020

Dec. 31, 2019USD ($)

Jun. 30, 2019EUR (€)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Dec. 31, 2020EUR (€)

Jan. 31, 2020EUR (€)

Dec. 31, 2019EUR (€)

May 30, 2017USD ($)

May 30, 2017EUR (€)

Debt Instrument [Line Items]

Long-term debt

$ 611,025,000

$ 625,492,000

$ 611,025,000

Debt default, maximum period of failure to comply with obligations, covenants or agreements

60 days

Debt default, holder percent to declare all notes due, minimum

30.00%

30.00%

Term loan facility balance

630,635,000

$ 643,184,000

630,635,000

Long-term debt

615,035,000

$ 631,604,000

615,035,000

Long-term debt, term

5 years

5 years

European Operations [Member]

Debt Instrument [Line Items]

Long-term debt

$ 70,700,000

Senior Notes, 6.00%, due 2025 [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

€ 250,000,000

36,800,000

36,800,000

€ 33,000,000

Debt instrument, interest rate stated, percentage

6.00%

Debt instrument, repurchase amount

35,900,000

35,900,000

Long-term debt

$ 32,300,000

32,300,000

Net gain on extinguishment of debt

$ 3,700,000

Senior Secured Term Loan Facility [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Amount of term loan facility

$ 400,000,000

$ 400,000,000

Line of credit facility maturity date

May 23, 2024

Repayments under term loan facility

50,800,000

Term loan facility balance

349,200,000

Amount outstanding

4,800,000

Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

0.00%

Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

4.00%

Senior Secured Term Loan Facility [Member] | Base Rate [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.00%

Senior Secured Term Loan Facility [Member] | Federal Funds Effective Swap Rate [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

0.50%

Senior Secured Term Loan Facility [Member] | One Month London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.00%

Senior Secured Term Loan Facility [Member] | One Month LIBOR Plus Margin [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

3.00%

Equipment Loan [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate stated, percentage

2.30%

2.30%

2.30%

Long-term debt

$ 13,400,000

$ 13,400,000

€ 12,000,000

Loans outstanding

13,000,000

€ 10,600,000

Debt Instrument Redemption Period One [Member] | Senior Notes, 6.00%, due 2025 [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Redemption percentage

103.00%

Debt Instrument Redemption Period Two [Member] | Senior Notes, 6.00%, due 2025 [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Redemption percentage

101.50%

Debt Instrument Redemption Period Three [Member] | Senior Notes, 6.00%, due 2025 [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Redemption percentage

100.00%

Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Commitment fees percentage

0.50%

Outstanding borrowings and undrawn letters of credit threshold amount

20,000,000

Line of credit facility, commitment amount

$ 160,000,000

Revolving Credit Facility [Member] | Minimum [Member]

Debt Instrument [Line Items]

Commitment fees percentage

0.50%

Net leverage ratio

1.00%

Revolving Credit Facility [Member] | Maximum [Member]

Debt Instrument [Line Items]

Commitment fees percentage

0.25%

Net leverage ratio

4.50%

Line of credit facility borrowing capacity percentage

35.00%

Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

3.50%

Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

3.50%

Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

3.00%

Revolving Credit Facility [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.50%

Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.50%

Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.00%

Revolving Credit Facility [Member] | Senior Secured Term Loan Facility [Member]

Debt Instrument [Line Items]

Amount of term loan facility

$ 160,000,000

Line of credit facility maturity date

May 23, 2022

Outstanding borrowings

$ 0

Revolving Credit Facility [Member] | Senior Secured Term Loan Facility [Member] | Senior Notes [Member]

Debt Instrument [Line Items]

Amount of availability

$ 155,200,000

Term Loan Facility [Member] | Senior Secured Term Loan Facility [Member]

Debt Instrument [Line Items]

Percentage of capital stock issued

65.00%

65.00%

Equipment Loan [Member] | European Operations [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate stated, percentage

2.20%

2.20%

Long-term debt

$ 10,700,000

Debt instrument, maturity date

Mar. 31, 2024

European Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Outstanding borrowings

$ 0

Amount outstanding

500,000

€ 400,000

Amount of availability

$ 73,300,000

€ 59,600,000

Current borrowing capacity under line of credit | €

€ 30,000,000

Debt instrument, maturity date

May 22, 2022

Percentage of management fee

0.07%

European Revolving Credit Facility [Member] | Minimum [Member]

Debt Instrument [Line Items]

Current borrowing capacity under line of credit | €

€ 30,000,000

€ 45,000,000

Annual commitment fee

0.50%

European Revolving Credit Facility [Member] | Maximum [Member]

Debt Instrument [Line Items]

Current borrowing capacity under line of credit | €

€ 45,000,000

€ 60,000,000

Annual commitment fee

1.05%

European Revolving Credit Facility [Member] | Euribor [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

0.00%

European Revolving Credit Facility [Member] | Euribor [Member] | Minimum [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.55%

European Revolving Credit Facility [Member] | Euribor [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

3.00%

European Revolving Credit Facility [Member] | Equipment Loan [Member]

Debt Instrument [Line Items]

Debt instrument, maturity date

Sep. 30, 2027

Quarterly payment, start date

Jun. 30, 2021

European Revolving Credit Facility [Member] | Equipment Loan [Member] | Scenario, Forecast [Member]

Debt Instrument [Line Items]

Quarterly payment

$ 600,000

€ 500,000

Debt - Schedule of Debt Maturit

Debt - Schedule of Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Maturities Of Long Term Debt [Abstract]
2021	$ 6,112
2022	6,575
2023	6,083
2024	352,422
2025	269,326
Thereafter	2,666
Total debt liabilities	$ 643,184	$ 630,635

Redeemable Preferred Stock - Ad

Redeemable Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Aug. 30, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Temporary Equity [Line Items]
Temporary equity, stock issued during period, shares, new issues		150,000	150,000	150,000
Temporary equity, par value		$ 0.01	$ 0.01	$ 0.01
Proceeds from issuance of redeemable preferred shares				$ 150,000
Preferred stock, dividend rate, percentage		9.00%	9.00%
Preferred stock redemption date		Sep. 14, 2025
Issuance costs				3,700
Embedded derivative liability				10,900
Adjusted proceeds from issuance of redeemable preferred shares				$ 135,500
Cumulative premium accretion		$ 43,900	$ 25,500
Redeemable preferred stock		179,387	$ 160,980
Convertible Preferred Stock Redemption Period Two [Member]
Temporary Equity [Line Items]
Convertible preferred stock, redemption value		$ 300,000
Convertible preferred stock, redemption value percent of stated value		200.00%
Convertible preferred stock, face value		$ 150,000
Common stock, shares issued upon conversion of preferred stock		5,300,000
Series A Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary equity, stock issued during period, shares, new issues				140,202
Temporary equity, par value	$ 0.01
Temporary equity, liquidation preference per share	1,000
Temporary equity, conversion price	$ 28.162
Preferred stock, dividend rate, percentage	9.00%
Convertible preferred stock, threshold stock price trigger				$ 84.49
Series B Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary equity, stock issued during period, shares, new issues				9,798

European Non-Controlling Rede_3

European Non-Controlling Redeemable Equity - Additional Information (Detail) - € / shares	12 Months Ended
	Dec. 31, 2020	May 30, 2017
Redeemable Noncontrolling Interest [Line Items]
Percentage of voting interest acquired	99.90%	92.30%
Domination and Profit Loss Transfer Agreement [Member]
Redeemable Noncontrolling Interest [Line Items]
Share price per share	€ 62.18
Guaranteed annual dividend for each share that is not tendered	€ 3.23
Guaranteed annual statutory rate for each share that is tendered	4.12%

European Non-Controlling Rede_4

European Non-Controlling Redeemable Equity - Summary of Redeemable Noncontrolling Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]
Dividends accrued	$ 205	$ 566
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Beginning balance	6,525	13,849
Dividends accrued	205	566
Dividends paid	(46)	(848)
Translation adjustment	2	(361)
Purchase of shares	(5,020)	(6,681)
Ending Balance	$ 1,666	$ 6,525

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Basic Earnings Per Share:
Net loss	$ (243,561)	$ (96,460)
Less: Redeemable preferred stock dividends and accretion	(31,994)	(30,977)
Less: European non-controlling redeemable equity dividend	(205)	(566)
Basic numerator	$ (275,760)	$ (128,003)
Basic loss per share	$ (10.81)	$ (5.10)
Weighted average shares outstanding – Basic	25,498	25,099
Diluted Earnings Per Share:
Net loss	$ (243,561)	$ (96,460)
Less: Redeemable preferred stock dividends and accretion	(31,994)	(30,977)
Less: European non-controlling redeemable equity dividend	(205)	(566)
Diluted numerator	$ (275,760)	$ (128,003)
Diluted loss per share	$ (10.81)	$ (5.10)
Weighted average shares outstanding – Basic	25,498	25,099
Weighted average shares outstanding – Diluted	25,498	25,099

Income Taxes - Income (Loss) Be

Income Taxes - Income (Loss) Before Income Taxes From Domestic and International Jurisdictions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Domestic	$ (74,151)	$ (60,170)
Foreign	(154,529)	(32,867)
Consolidated income (loss) before income taxes	$ (228,680)	$ (93,037)

Income Taxes - Benefit (Provisi

Income Taxes - Benefit (Provision) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal	$ 1,970	$ 3,834
State	(29)	(146)
Foreign	(9,333)	(10,615)
Total current taxes	(7,392)	(6,927)
Federal	(4,756)	(3,174)
State	(3,622)	1,014
Foreign	889	5,664
Total deferred taxes	(7,489)	3,504
Income tax benefit (provision)	$ (14,881)	$ (3,423)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of the U.S. Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%
State tax provisions, net of federal income tax benefit	0.60%	2.70%
Tax credits	(0.10%)	6.60%
Foreign income taxes at rates other than the statutory rate	10.90%	17.70%
Valuation allowance	(10.40%)	(6.90%)
Changes in tax liabilities, net	(0.20%)	(0.30%)
Share based compensation	(0.20%)	(1.80%)
Unremitted non-U.S. Earnings	(1.70%)
US Tax on non-US income	0.80%	(6.70%)
Non taxable income		2.40%
Impairment of Goodwill	(25.30%)	(34.00%)
Other	(1.90%)	(4.40%)
Effective income tax rate	(6.50%)	(3.70%)

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets:
Accrued liabilities	$ 3,688	$ 4,695
Hedging and foreign currency gains (losses)	3,323	2,386
Deferred compensation	8,473	8,018
Inventory reserves	5,114	4,609
Net loss carryforwards and credits	48,924	38,342
Interest carryforwards	14,972	19,632
Competent authority deferred tax assets and other foreign timing differences	4,465	3,954
Other	1,714	782
Total before valuation allowance	90,673	82,418
Valuation allowance	(46,490)	(22,879)
Net deferred income tax assets	44,183	59,539
Deferred income tax liabilities:
Intangibles, property, plant and equipment and other	(17,959)	(33,301)
Unremitted earnings	(4,468)
Deferred income tax liabilities	(22,427)	(33,301)
Net deferred income tax assets	21,756	26,238
Long-term deferred income tax assets	30,860	38,607
Long-term deferred income tax liabilities	(9,104)	(12,369)
Net deferred tax asset	$ 21,756	$ 26,238

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Unrecognized Tax Benefits Summary [Line Items]
Valuation allowance	$ 23,600,000
Tax credit carryforward, amount	17,700,000
Unrecognized tax benefits that would favorably impact effective tax rate	4,500,000
Unrecognized tax benefits, income tax penalties and interest accrued	4,700,000	$ 3,900,000
Decrease in unrecognized tax benefits in next twelve months	0
U.S. Federal, and Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating Loss Carryforwards	22,300,000
U.S. State [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating Loss Carryforwards	$ 11,500,000
Earliest Tax Year [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating loss carryforwards, expiration year	2021
State tax credit carryforwards, expiration year	2021
Open tax year	2014
Earliest Tax Year [Member] | U.S. [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2015
Earliest Tax Year [Member] | Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2017
Latest Tax Year [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating loss carryforwards, expiration year	2041
State tax credit carryforwards, expiration year	2027
Open tax year	2019
Latest Tax Year [Member] | U.S. [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2018
Latest Tax Year [Member] | Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2018

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits Roll Forward (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Beginning balance	$ 30,368	$ 31,036
Increases (decreases) due to foreign currency translations	2,265	(632)
Increases (decreases) as a result of positions taken during: Prior periods	(1,147)	(36)
Current period	372
Ending balance	$ 31,858	$ 30,368

Leases - Additional Information

Leases - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Operating Leased Assets [Line Items]
Lessee, operating lease, option to extend	Certain leases include options to extend the lease term for up to ten years
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract	9 years

Leases - Schedule of Lease Expe

Leases - Schedule of Lease Expense, Cash Flow, Operating and Finance Lease Assets and Liabilities, Average Lease Term and Average Discount Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease expense:
Amortization of right-of-use assets	$ 1,219	$ 1,691
Interest on lease liabilities	85	83
Operating lease expense	3,388	3,509
Total lease expense	4,692	5,283
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from finance leases	85	83
Operating cash outflows from operating leases	3,621	3,463
Financing cash outflows from finance leases	960	1,230
Right-of-use assets obtained in exchange for finance lease liabilities, net of terminations and disposals	879	2,573
Right-of-use assets obtained in exchange for operating lease liabilities, net of terminations and disposals	657	18,961
Operating leases:
Other non-current assets	13,598	15,201
Accrued liabilities	$ (2,868)	$ (2,949)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Other non-current liabilities	$ (11,513)	$ (13,282)
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total operating lease liabilities	$ (14,381)	$ (16,231)
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesAndStockholdersEquity	us-gaap:LiabilitiesAndStockholdersEquity
Property, plant and equipment gross	$ 5,735	$ 4,821
Accumulated depreciation	(3,319)	(2,118)
Property, plant and equipment, net	2,416	2,703
Current portion of long-term debt	(1,113)	(1,023)
Long-term debt (less current portion)	(2,275)	(2,045)
Total finance lease liabilities	$ (3,388)	$ (3,068)
Weighted-average remaining lease term - finance leases (years)	3 years 10 months 24 days	4 years 1 month 6 days
Weighted-average remaining lease term - operating leases (years)	6 years 1 month 6 days	6 years 4 months 24 days
Weighted-average discount rate - finance leases	3.00%	2.90%
Weighted-average discount rate - operating leases	3.80%	3.90%

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Rental Payments For Finance and Operating Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Finance Leases, 2021	$ 1,186
Finance Leases, 2022	1,080
Finance Leases, 2023	568
Finance Leases, 2024	160
Finance Leases, 2025	152
Finance Leases, Thereafter	425
Finance Leases, Total	3,571
Finance Leases, Less: Imputed interest	(183)
Finance Leases, Total lease liabilities, net of interest	3,388	$ 3,068
Operating Leases, 2021	2,879
Operating Leases, 2022	2,870
Operating Leases, 2023	2,499
Operating Leases, 2024	2,279
Operating Leases, 2025	2,229
Operating Leases, Thereafter	3,163
Operating Leases, Total	15,919
Operating Leases, Less: Imputed interest	(1,538)
Operating Leases, Total lease liabilities, net of interest	$ 14,381	$ 16,231

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)Age	Dec. 31, 2019USD ($)
Compensation And Retirement Disclosure [Abstract]
Age for benefits | Age	65
Defined contribution plan, cost recognized | $	$ 1.3	$ 1.5

Retirement Plans - Summary of C

Retirement Plans - Summary of Changes in Plan Assets and Plan Benefit Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Beginning benefit obligation	$ 31,001	$ 26,953
Interest cost	1,005	1,144
Actuarial loss	2,164	4,295
Benefit payments	(1,530)	(1,391)
Ending benefit obligation	$ 32,640	$ 31,001

Retirement Plans - Schedule of

Retirement Plans - Schedule of Defined Benefit Plans Disclosures (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Fair value of plan assets at beginning of year	$ 0	$ 0
Employer contribution	1,475	1,391
Benefit payments	(1,475)	(1,391)
Fair value of plan assets at end of year	0	0
Funded status	(32,640)	(31,001)
Accrued expenses	(1,447)	(1,478)
Other non-current liabilities	(31,193)	(29,523)
Net amount recognized	(32,640)	(31,001)
Net actuarial loss	10,760	8,940
Prior service cost	(1)	(1)
Net amount recognized, before tax effect	$ 10,759	$ 8,939
Discount rate	2.60%	3.30%
Rate of compensation increase	3.00%	3.00%

Retirement Plans - Schedule o_2

Retirement Plans - Schedule of Net Benefit Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Interest cost	$ 1,005	$ 1,144
Amortization of actuarial loss	288	209
Net periodic pension cost	$ 1,293	$ 1,353
Discount rate	3.30%	4.40%
Rate of compensation increase	3.00%	3.00%

Retirement Plans - Schedule o_3

Retirement Plans - Schedule of Expected Benefit Payments (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Compensation And Retirement Disclosure [Abstract]
2021	$ 1,465
2022	1,510
2023	1,492
2024	1,533
2025	1,739
Years 2026 to 2030	$ 8,815

Retirement Plans - Periodic Pen

Retirement Plans - Periodic Pension Cost, Next Fiscal Year (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ 1,005	$ 1,144
Estimated 2021 net periodic pension cost		$ 1,293	$ 1,353
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 823
Amortization of actuarial loss	387
Estimated 2021 net periodic pension cost	$ 1,210

Accrued Expenses - Schedule of

Accrued Expenses - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Payroll and related benefits	$ 26,930	$ 25,048
Taxes, other than income taxes	14,502	12,096
Current portion of derivative liability	8,350	4,357
Deferred tooling revenue	8,249	5,880
Short-term operating lease liability	2,868	2,949
Dividends and interest	1,453	1,247
Current portion of executive retirement liabilities	1,447	1,478
Professional fees	1,102	2,216
Other	6,178	5,574
Accrued liabilities	$ 71,079	$ 60,845

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	May 16, 2019	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorizes issuance of common stock		4,350,000
Number of shares available for grant		200,000
Maximum shares that may be used as full value awards		1,200,000
Stock-based compensation expense		$ 2.4	$ 5.7
Amount of unrecognized stock-based compensation expense		$ 3.3
Weighted average period for recognition		1 year 6 months
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Grants in period		763,674
Restricted Stock Units [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period	333,333
Performance Shares Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Grants in period		1,207,351
PSU awards earnings expected target	200.00%
Performance Shares Unit [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Grants in period	666,667
Shares awarded under the plan, vesting description		(a) 666,667 PSUs at target, vesting in three approximately equal installments, to the extent the performance metrics are satisfied, during each of three performance periods and (b) 333,333 RSUs, vesting in approximately equal installments on February 28, 2020, 2021 and 2022; (ii) a 2019-2021 PSU grant, with the target number of 316,832 PSUs, which will vest to the extent the performance metrics are satisfied; and (iii) a 2019 RSU grant of 158,416 RSUs, vesting in approximately equal installments on February 28, 2020, 2021 and 2022. The PSU awards may be earned at up to 200 percent of target depending on the level of achievement of the performance metrics
2019-2021 PSU [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period	316,832
2019 RSU [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period	158,416

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Restricted Stock Unit and Restricted Performance Stock Unit Activity (Detail)	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Number of Options Outstanding
Number of Options Outstanding, Beginning balance (in shares) | shares	50,250
Forfeited or expired (in shares) | shares	(26,250)
Number of Options Outstanding, Ending balance (in shares) | shares	24,000
Options vested or expected to vest, Outstanding (in shares) | shares	24,000
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance (in dollars per share) | $ / shares	$ 18.86
Forfeited or expired (in dollars per share) | $ / shares	17.46
Weighted Average Exercise Price, Ending balance (in dollars per share) | $ / shares	20.39
Vested or expected to vest (in dollar per share) | $ / shares	$ 20.39
Restricted Stock Units [Member]
Number of Awards
Number of Awards, Beginning balance (in shares) | shares	1,047,256
Granted (in shares) | shares	763,674
Settled (in shares) | shares	(401,723)
Forfeited or expired (in shares) | shares	(195,540)
Number of Awards, Ending balance (in shares) | shares	1,213,667
Number of Awards, vested or expected to vest, Outstanding (in shares) | shares	1,118,978
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares	$ 5.39
Granted (in dollars per share) | $ / shares	2.64
Settled (in dollars per share) | $ / shares	6.14
Forfeited or expired (in dollars per share) | $ / shares	4.27
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares	3.59
Vested or expected to vest (in dollar per share) | $ / shares	$ 3.59
Performance Shares Unit [Member]
Number of Awards
Number of Awards, Beginning balance (in shares) | shares	1,548,793
Granted (in shares) | shares	1,207,351
Settled (in shares) | shares	(245,713)
Forfeited or expired (in shares) | shares	(334,141)
Number of Awards, Ending balance (in shares) | shares	2,176,290
Number of Awards, vested or expected to vest, Outstanding (in shares) | shares	430,624
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares	$ 7.17
Granted (in dollars per share) | $ / shares	2.95
Settled (in dollars per share) | $ / shares	5.05
Forfeited or expired (in dollars per share) | $ / shares	7.44
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares	4.88
Vested or expected to vest (in dollar per share) | $ / shares	$ 6.99

Receivables Factoring - Additio

Receivables Factoring - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021
Accounts Receivable [Line Items]
Trade receivables	$ 522,500,000	$ 334,100,000
Collective limit under factoring arrangements	132,000,000	117,300,000
Factored receivables yet not collected	96,600,000	49,600,000
Subsequent Event [Member]
Accounts Receivable [Line Items]
Collective limit under factoring arrangements			$ 122,000,000
North American [Member]
Accounts Receivable [Line Items]
Temporary increase in the factoring limit	10,000,000
Other (Expense) Income, Net [Member]
Accounts Receivable [Line Items]
Factoring fees	$ 1,400,000	$ 1,000,000

Restructuring - Additional Info

Restructuring - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Automotive Racing Market Segment [Member]
Restructuring Cost And Reserve [Line Items]
Non-cash restructuring charge	$ 3.4
Restructuring charge, write-down of after-market inventory to salvage value	1.3
Restructuring charge, employee severance	1			$ 0.7
Restructuring charges, contract terminations costs	0.5
Restructuring severance accrual				1.1	$ 1.1
Automotive Racing Market Segment [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Non-cash restructuring charge	2.8
Restructuring charge, employee severance				0.4
Automotive Racing Market Segment [Member] | Selling, General and Administrative Expense [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge, employee severance	$ 0.6			0.3
Fayetteville, Arkansas Manufacturing Facility [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge, employee severance			$ 1.6
Restructuring severance accrual				$ 0.3	0.3
Accelerated depreciation			7.6			$ 7.6
Restructuring charge, write-down of inventory to net salvage value			3.2
Restructuring charge, accelerated amortization of right of use assets			0.6
Relocation costs		$ 1.8			2.9
Additional other costs					$ 0.4
Fayetteville, Arkansas Manufacturing Facility [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Non-cash restructuring charge			$ 13

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Accounts Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 2,867	$ 4,298
Additions, Charge to Costs and Expenses	253	919
Additions, Other		56
Deductions From Reserves	(2,257)	(2,406)
Balance at End of Year	863	2,867
Valuation Allowances for Deferred Tax Assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	22,879	16,576
Additions, Charge to Costs and Expenses	22,146	6,822
Additions, Other	1,465
Deductions From Reserves		(519)
Balance at End of Year	$ 46,490	$ 22,879