Superior Industries International (SUP) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 25, 2017	Jul. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	SUPERIOR INDUSTRIES INTERNATIONAL INC
Entity Central Index Key	95,552
Current Fiscal Year End Date	--12-25
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 25, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		24,904,545

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Income Statement [Abstract]
NET SALES	$ 240,628	$ 182,709	$ 414,848	$ 368,774
Cost of sales	220,601	153,012	375,409	311,332
Restructuring costs (Note 4)	(78)	157	130	187
Cost of sales, including restructuring costs	220,523	153,169	375,539	311,519
GROSS PROFIT	20,105	29,540	39,309	57,255
Selling, general and administrative expenses	22,103	10,000	37,363	18,993
INCOME (LOSS) FROM OPERATIONS	(1,998)	19,540	1,946	38,262
Interest (expense) income, net	(14,729)	79	(15,025)	111
Other income (expense), net	7,486	(372)	7,138	(105)
CONSOLIDATED (LOSS) INCOME BEFORE INCOME TAXES	(9,241)	19,247	(5,941)	38,268
Income tax benefit (provision)	1,722	(6,082)	1,524	(10,640)
CONSOLIDATED NET (LOSS) INCOME	(7,519)		(4,417)	27,628
Less: Net loss attributable to non-controlling interest	247	0	247	0
NET (LOSS) INCOME ATTRIBUTABLE TO SUPERIOR	$ (7,272)	$ 13,165	$ (4,170)	$ 27,628
INCOME (LOSS) PER SHARE - BASIC (in dollars per share)	$ (0.41)	$ 0.52	$ (0.28)	$ 1.08
INCOME (LOSS) PER SHARE - DILUTED (in dollars per share)	(0.41)	0.52	(0.28)	1.08
DIVIDENDS DECLARED PER SHARE (in dollars per share)	$ 0.09	$ 0.18	$ 0.27	$ 0.36

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income attributable to Superior	$ (7,272)	$ 13,165	$ (4,170)	$ 27,628
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss), net of tax	14,295	(6,821)	23,345	(8,666)
Change in unrecognized gains (losses) on derivative instruments:
Change in fair value of derivatives	10,568	(6,734)	27,962	(5,416)
Tax provision	0	0	(335)	(266)
Change in unrecognized gains (losses) on derivative instruments, net of tax	10,568	(6,734)	27,627	(5,682)
Defined benefit pension plan:
Actuarial gains on pension obligation, net of curtailments and amortization	93	84	185	168
Tax provision	25	30	49	62
Pension changes, net of tax	68	54	136	106
Other comprehensive income (loss), net of tax	24,931	(13,501)	51,108	(14,242)
Comprehensive income (loss) attributable to Superior	$ 17,659	$ (336)	$ 46,938	$ 13,386

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 25, 2016
Current assets:
Cash and cash equivalents	$ 58,732	$ 57,786
Short-term investments	750	750
Restricted cash	62,488	0
Accounts receivable, net	179,127	99,331
Inventories	172,623	82,837
Income taxes receivable	6,353	3,682
Other current assets	28,551	9,695
Total current assets	508,624	254,081
Property, plant and equipment, net	501,607	227,403
Investment in unconsolidated affiliate	2,000	2,000
Goodwill	310,728	0
Intangibles, net	212,961	0
Non-current deferred income tax assets, net	53,397	28,838
Other non-current assets	37,013	30,434
Total assets	1,626,330	542,756
Current liabilities:
Accounts payable	96,809	37,856
Accrued expenses	64,470	46,315
Current portion of long-term debt	18,800	0
Income taxes payable	1,504	1,793
Total current liabilities	181,583	85,964
Long-term debt (less current portion)	721,056	0
Non-current income tax liabilities	5,816	5,301
Non-current deferred income tax liabilities, net	33,225	3,628
Other non-current liabilities	43,323	49,637
Commitments and contingencies (Note 18)	0	0
Redeemable preferred shares, $0.01 par value, 1,000,000 shares authorized, 150,000 shares outstanding at June 25, 2017	147,492	0
Shareholders' equity:
Common stock, no par value, Authorized - 100,000,000 shares, Issued and outstanding - 24,906,000 shares (25,143,950 shares at December 25, 2016)	88,669	89,916
Accumulated other comprehensive loss	(73,817)	(124,925)
Retained earnings	415,086	433,235
Superior shareholders' equity	429,938	398,226
Noncontrolling interests	63,897	0
Total shareholders' equity	493,835	398,226
Total liabilities and shareholders' equity	$ 1,626,330	$ 542,756

Condensed Consolidated Balance5

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 25, 2017	Dec. 25, 2016
Statement of Financial Position [Abstract]
Temporary equity, par value (in dollars per share)	$ 0.01	$ 0.01
Temporary equity, shares authorized	1,000,000	1,000,000
Temporary equity, shares outstanding	150,000	150,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000,000	100,000,000,000
Common stock, shares issued	24,906,000,000	25,143,950,000
Common stock, shares outstanding	24,906,000,000	25,143,950,000

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016
Statement of Cash Flows [Abstract]
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$ (10,093)	$ 24,522
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant and equipment	(29,982)	(17,692)
Acquisition of Uniwheels, net of cash acquired	(690,704)	0
Proceeds from sales and maturities of investments	0	200
Proceeds from sale of property, plant and equipment	2	1
NET CASH USED IN INVESTING ACTIVITIES	(720,684)	(17,491)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	975,571	0
Proceeds from issuance of redeemable preferred shares	150,000	0
Debt repayment	(282,322)	0
Cash dividends paid	(8,985)	(9,232)
Cash paid for common stock repurchase	(5,014)	(13,098)
Payments related to tax withholdings for stock-based compensation	(1,457)	0
Proceeds from exercise of stock options	0	898
Excess tax benefits from exercise of stock options	0	0
Redeemable preferred shares issuance costs	(3,737)	0
Financing costs paid	(30,460)	0
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	793,596	(21,432)
Effect of exchange rate changes on cash	615	(160)
Net increase (decrease) in cash and cash equivalents	63,434	(14,561)
Cash and cash equivalents, and restricted cash at the beginning of the period	57,786	52,036
Cash and cash equivalents, and restricted cash at the end of the period	$ 121,220	$ 37,475

Condensed Consolidated Stateme7

Condensed Consolidated Statement of Shareholders' Equity - 6 months ended Jun. 25, 2017 - USD ($) $ in Thousands	Total	Common Stock	Unrecognized Gains (Losses) on Derivative Instruments	Pension Obligations	Cumulative Translation Adjustment	Retained Earnings	Non-controlling Interest
Net (loss) income attributable to Superior	$ (4,170)					$ (4,170)
Beginning of the period (in shares) at Dec. 25, 2016	25,143,950,000	25,143,950
Beginning of period at Dec. 25, 2016	$ 398,226	$ 89,916	$ (16,101)	$ (3,636)	$ (105,188)	433,235	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(4,417)						(247)
Change in unrecognized gains (losses) on derivative instruments, net of tax	27,627		27,627
Change in employee benefit plans, net of taxes	136			136
Foreign currency translation gain (loss), net of tax	$ 23,345				23,345
Stock options exercised (in shares)	0	0
Stock options exercised	$ 0	$ 0
Restricted stock awards granted, net of forfeitures (in shares)		33,692
Stock-based compensation expense (in shares)		(55,801)
Stock-based compensation expense	(470)	$ (470)
Common stock repurchased (in shares)		(215,841)
Common stock repurchased	(5,014)	$ (777)				(4,237)
Cash dividends declared ($0.27 per share)	(6,860)					(6,860)
Redeemable preferred dividend	(2,882)					(2,882)
Non-controlling interest	$ 64,144						64,144
End of the period (in shares) at Jun. 25, 2017	24,906,000,000	24,906,000
End of period at Jun. 25, 2017	$ 493,835	$ 88,669	$ 11,526	$ (3,500)	$ (81,843)	$ 415,086	$ 63,897

Condensed Consolidated Stateme8

Condensed Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Statement of Stockholders' Equity [Abstract]
DIVIDENDS DECLARED PER SHARE (in dollars per share)	$ 0.09	$ 0.18	$ 0.27	$ 0.36

Nature of Operations

Nature of Operations	6 Months Ended
	Jun. 25, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Headquartered in Southfield, Michigan, the principal business of Superior Industries International, Inc. (referred to herein as the “company” or “we,” “us” and “our”) is the design and manufacture of aluminum wheels for sale to original equipment manufacturers ("OEMs"). We are one of the largest suppliers of cast aluminum wheels to the world’s leading automobile and light truck manufacturers, with manufacturing operations in North America and Europe. Customers in North America and Europe represent the principal market for our products. Ford Motor Company ("Ford"), General Motors Company ("GM") and Toyota Motor Company ("Toyota") were our customers individually accounting for more than 10 percent of our consolidated sales in the first half of 2017 and together represented approximately 69 percent of our trade sales during the first half of 2017 . Additionally, Nissan Motor Co., Ltd. ("Nissan") and Fiat Chrysler Automotive N.V. ("FCA") individually accounted for 7 percent and 5 percent , respectively of our consolidated sales during the first half of 2017 and together with Ford, GM and Toyota represented approximately 81 percent of our trade sales during the first half of 2017 . We also manufacture aluminum wheels for BMW, Mazda, Subaru, Tesla and Volkswagen. The loss of all or a substantial portion of our sales to Ford, GM or Toyota would have a significant adverse impact on our operating results and financial condition. This risk is partially mitigated by our long-term relationships with these OEM customers and our supply arrangements, which are generally for multi-year periods. Additionally, the acquisition of Uniwheels AG ("Uniwheels") on May 30, 2017 diversifies our OEM customer base to include Audi AG ("Audi"), Mercedes-Benz, and other European customers and also provides new aftermarket customers. Demand for automobiles and light trucks (including SUVs and crossover vehicles) in the North American and European markets is subject to many unpredictable factors such as changes in the general economy, gasoline prices, consumer credit availability and interest rates. Demand for aluminum wheels can be further affected by other factors, including pricing and performance compared to competitive materials such as steel. Additionally, the demand for our products is influenced by shifts of market share between vehicle manufacturers and the specific market penetration of individual vehicle platforms being sold by our customers. We have had long-term relationships with our customers and our supply arrangements generally are for multi-year periods however, maintaining such long-term arrangements on terms acceptable to us remains challenging due to global competitive pricing pressures. The raw materials used in producing our products are readily available and are obtained through suppliers with whom we have, in many cases, relatively long-standing trade relations.

Presentation of Condensed Conso

Presentation of Condensed Consolidated Financial Statements	6 Months Ended
	Jun. 25, 2017
Accounting Policies [Abstract]
Presentation of Condensed Consolidated Financial Statements	Presentation of Condensed Consolidated Financial Statements During interim periods, we follow the accounting policies set forth in our Annual Report on Form 10-K for the fiscal year ended December 25, 2016 (the "2016 Annual Report on Form 10-K") and apply appropriate interim financial reporting standards for a fair statement of our operating results and financial position in conformity with accounting principles generally accepted in the United States of America, as codified by the Financial Accounting Standards Board ("FASB") in the Accounting Standards Codification ("ASC") (referred to herein as "U.S. GAAP"), as indicated below. For convenience of presentation, the 2016 fiscal year is referred to as December 31, but actually reflects our financial position and results of operations for the period described below. Users of financial information produced for interim periods in 2017 are encouraged to read this Quarterly Report on Form 10-Q in conjunction with our consolidated financial statements and notes thereto filed with the Securities and Exchange Commission ("SEC") in our 2016 Annual Report on Form 10-K. Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time, including the use of estimated effective tax rates. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results. We use a 4-4-5 convention for our fiscal quarters, which are thirteen week periods generally ending on the last Sunday of each calendar quarter. We refer to these thirteen week fiscal periods as “quarters” throughout this report. Uniwheels uses a regular calendar close with months ending on the last day of the month. Therefore, during the second and third quarters there will be a slight difference in timing of close, but the year ends will align on December 31, 2017. Thereafter, we will go to a consolidated close with each month ending on the last day of the month. The slight difference in timing is not considered to be significant to the consolidated financial statements. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the SEC’s requirements for quarterly reports on Form 10-Q and U.S. GAAP and, in our opinion, contain all adjustments, of a normal and recurring nature, which are necessary for a fair statement of (i) the condensed consolidated statements of operations for the thirteen and twenty-six week period ended June 25, 2017 , (ii) the condensed consolidated statements of comprehensive income for the thirteen and twenty-six week period ended June 25, 2017 , (iii) the condensed consolidated balance sheets at June 25, 2017 and December 31, 2016 , (iv) the condensed consolidated statements of cash flows for the twenty-six week period ended June 25, 2017 , and (v) the condensed consolidated statement of shareholders’ equity for the twenty-six week period ended June 25, 2017 . However, the accompanying unaudited condensed consolidated financial statements do not include all information and notes required by U.S. GAAP. The condensed consolidated balance sheet as of December 31, 2016 , included in this report, was derived from our 2016 audited financial statements but does not include all disclosures required by U.S. GAAP. New Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update ("ASU") “Revenue from Contracts with Customers.” This update outlines a single, comprehensive model for accounting for revenue from contracts with customers. We plan to adopt this update on January 1, 2018. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). We anticipate adopting the standard using the modified retrospective method. There may be differences in timing of revenue recognition under the new standard compared to recognition under ASC 605 - Revenue Recognition. In July 2015, the FASB issued an ASU entitled “Simplifying the Measurement of Inventory.” The ASU replaces the current lower of cost or market test with a lower of cost or net realizable value test when cost is determined on a first-in, first-out or average cost basis. The standard is effective for public entities for annual reporting periods beginning after December 15, 2016 and interim periods therein. It was applied prospectively in the first quarter of 2017 and the adoption of this ASU had no impact on our financial position and statement of operations. In February of 2016, the FASB issued ASU 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 requires an entity to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. ASU 2016-02 offers specific accounting guidance for a lessee, a lessor and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. For public companies, ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and requires a modified retrospective adoption, with early adoption permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In March 2016, the FASB issued an ASU entitled "Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." The objective of the ASU is to simplify several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The adoption of this ASU in the first quarter of 2017 had no significant impact on our financial position and statement of operations. Also, certain disclosures in the statement of cash flows were modified in accordance with this ASU. In August 2016, the FASB issued an ASU entitled "Statement of Cash Flows (Topic 740): Classification of Certain Cash Receipts and Cash Payments." The objective of the ASU is to address the diversity in practice in the presentation of certain cash receipts and cash payments in the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our statement of cash flows. In October 2016, the FASB issued an ASU entitled "Income Taxes (Topic 230): Intra-Entity Transfers of Assets Other than Inventory." The objective of the ASU is to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In November 2016, the FASB issued an ASU entitled "Statement of Cash Flows (Topic 230): Restricted Cash." The objective of the ASU is to address the diversity in practice that exists in the classification and presentation of changes in restricted cash on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our statement of cash flows. In January 2017, the FASB issued an ASU entitled "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment." The objective of the ASU is to simplify how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In January 2017, the FASB issued an ASU entitled "Business Combinations (Topic 805): Clarifying the Definition of a Business." The objective of the ASU is to add guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In March 2017, the FASB issued an ASU entitled "Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." The objective of the ASU is to improve the reporting of net benefit cost in the financial statements. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations.

Acquisition

Acquisition	6 Months Ended
	Jun. 25, 2017
Business Combinations [Abstract]
Acquisition	Acquisition On March 23, 2017, Superior announced that it had entered into various agreements to commence a tender offer to acquire 100% of the outstanding equity interests of Uniwheels (the "Acquisition") through a newly-formed, wholly-owned subsidiary (the “Acquisition Sub”). The Acquisition was effected through a multi-step process as more fully described below. In the first step of the Acquisition, on March 23, 2017, Superior obtained a commitment from the owner of approximately 61 percent of the outstanding stock of Uniwheels, Uniwheels Holding (Malta) Ltd. (the “Significant Holder”), evidenced by an irrevocable undertaking agreement (the “Undertaking Agreement”) to tender such stock in the second step of the Acquisition. In connection with the Undertaking Agreement, on March 23, 2017: (i) Superior entered into a business combination agreement with Uniwheels pursuant to which, subject to the provisions of the German Stock Corporation Act, Uniwheels and its subsidiaries undertook to, among other things, cooperate with the financing of the Acquisition; and (ii) Superior and the Significant Holder entered into a guarantee and indemnification agreement pursuant to which Superior will hold the Significant Holder harmless for claims that may arise relating to its involvement with Uniwheels. As Uniwheels is a company listed on the Warsaw Stock Exchange, the Acquisition was required to be carried out in accordance with the Polish Act of 29 July 2005 on Public Offerings and the Conditions for Introducing Financial Instruments to Organized Trading and Public Companies (the “Public Offering Act”). Following the publication of a formal tender offer document by Superior, as required by the Public Offering Act, Superior commenced the acceptance period for the tender offer (the “Tender Offer”) on April 12, 2017, pursuant to which, Superior offered to purchase all (but not less than 75 percent of) the outstanding stock of Uniwheels and, upon the consummation of the Tender Offer, agreed to purchase the stock of the Significant Holder along with all other stock of Uniwheels tendered pursuant to the Tender Offer. On May 30, 2017, Superior acquired 92.3 percent of the outstanding stock of Uniwheels for approximately $703.0 million (based on an exchange rate of 1.00 Dollar = 3.74193 Polish Zloty). We refer to this acquisition as the “First Step Acquisition.” Under the terms of the Tender Offer: • the Significant Holder received cash consideration of Polish Zloty 226.5 per share; and • Uniwheels’ other shareholders received cash consideration of Polish Zloty 247.87 per share, equivalent to the volume weighted-average-price of Uniwheels’ shares for the three months prior to commencement of the Tender Offer, plus 5.0 percent . On June 30, 2017, the company announced that it had commenced the delisting and associated tender process for the remaining outstanding shares of Uniwheels. As of July 31, 2017, 109,959 additional shares were tendered. Following or simultaneously with the approval of the delisting by the Polish regulator, Superior anticipates (i) consummating an upstream merger of Uniwheels into Acquisition Sub pursuant to which fair cash compensation will be paid to Uniwheels’ minority stockholders and (ii) entering into a Domination and Profit Loss Transfer Agreement (“DPLTA”). Superior anticipates that the process of acquiring the remaining 7.7 percent of Uniwheels’ outstanding shares will take approximately eight to ten months . We refer to this acquisition as the “Second Step Acquisition.” The aggregate equity purchase price of the Acquisition (assuming the remaining 7.7 percent of Uniwheels’ stock is acquired for cash consideration of Polish Zloty 247.87 per share (the price paid to Uniwheels’ shareholders in the Tender Offer) and an exchange rate of 1.00 Dollar = 3.74193 Polish Zloty) will be approximately $778.0 million . We entered into foreign currency hedges prior to the closing of the First Step Acquisition intended to reduce currency risk associated with the settlement of the Tender Offer (the “Hedging Transactions”). The net benefit of such Hedging Transactions to Superior reduced the total anticipated purchase price of the Acquisition to $766.2 million . The company’s condensed consolidated financial statements for the thirteen and twenty-six week periods ended June 25, 2017 and June 26, 2016 include Uniwheels results of operations from May 30, 2017 through June 30, 2017 (please see Note 7, "Business Segments" for the geographic segment results included within the condensed consolidated financial statements for the thirteen and twenty-six week periods ended June 25, 2017 and June 26, 2016, which include Uniwheels results of operations from May 30, 2017 through June 30, 2017). The company’s condensed consolidated financial statements reflect the purchase accounting adjustments in accordance with ASC 805 “Business Combinations”, whereby the purchase price was allocated to the assets acquired and liabilities assumed based upon their estimated fair values on the acquisition date. During the second quarter of 2017, the company determined a preliminary valuation of the identifiable assets acquired and the liabilities assumed. The following is the allocation of the purchase price: (Dollars in thousands) Estimated purchase price Cash consideration $ 703,000 Non-controlling interest 63,200 Preliminary purchase price allocation Cash and cash equivalents 12,296 Accounts receivable 60,580 Inventories 82,402 Prepaid expenses and other current assets 11,479 Total current assets 166,757 Property and equipment 250,000 Intangible assets (1) 212,000 Goodwill 306,154 Other assets 20,937 Total assets acquired 955,848 Accounts payable 61,883 Other current liabilities 40,361 Total current liabilities 102,244 Other long-term liabilities 87,404 Total liabilities assumed 189,648 Net assets acquired $ 766,200 (1) Intangible assets are recorded at estimated fair value, as determined by management based on available information which includes a preliminary valuation prepared by an independent third party. The fair values assigned to identifiable intangible assets were determined through the use of the income approach, specifically the relief from royalty and multi-period excess earnings methods. The major assumptions used in arriving at the estimated identifiable intangible asset values included management’s estimates of future cash flows, discounted at an appropriate rate of return which are based on the weighted average cost of capital for both the company and other market participants. The useful lives for intangible assets were determined based upon the remaining useful economic lives of the intangible assets that are expected to contribute directly or indirectly to future cash flows. The estimated fair value of intangible assets and related useful lives as included in the preliminary purchase price allocation include: Estimated Fair Value Estimated Useful Life (in Years) (Dollars in thousands) Brand name $ 9,000 5-6 Technology 16,000 4-6 Customer relationships 167,000 6-11 Trade names 20,000 Indefinite $ 212,000 The above goodwill represents future economic benefits expected to be recognized from the company’s expansion into the European wheel market, as well as expected future synergies and operating efficiencies from combining operations with Uniwheels. Goodwill resulting from the Acquisition of $306.2 million has been allocated to the European segment. The unaudited combined pro forma information is for informational purposes only. The pro forma information is not necessarily indicative of what the combined company’s results actually would have been had the Acquisition been completed as of the beginning of the periods as indicated. In addition, the unaudited pro forma information does not purport to project the future results of the combined company. Thirteen Weeks Ended Twenty-six Weeks Ended June 25, 2017 June 26, 2016 June 25, 2017 June 26, 2016 Proforma Proforma Proforma Proforma (Dollars in thousands) Net sales as reported $ 240,628 $ 182,709 $ 414,848 $ 368,774 Uniwheels sales, prior to the Acquisition 103,751 128,655 243,744 248,946 Proforma combined sales $ 344,379 $ 311,364 $ 658,592 $ 617,720 Net (loss) income as reported $ (7,519 ) $ 13,165 $ (4,417 ) $ 27,628 Uniwheels net income before income taxes, prior to the Acquisition 8,465 16,445 25,394 28,197 Incremental interest expense on the debt (7,081 ) (10,622 ) (17,776 ) (21,332 ) Incremental amortization on the identifiable intangible assets (4,388 ) (6,582 ) (10,970 ) (13,164 ) Transaction expenses incurred by both the company and Uniwheels 12,722 — 19,684 — Income tax expense related to the proforma adjustments 875 1,675 33 4,411 Proforma net income $ 3,074 $ 14,081 $ 11,948 $ 25,740 Restricted Cash Restricted cash disclosed on the condensed consolidated balance sheet relates to funds held for the purpose of acquiring the remaining 7.7% of Uniwheels’ outstanding shares, which will take approximately eight to ten months, and to pay down assumed debt related to our European operations.

Restructuring (Notes)

Restructuring (Notes)	6 Months Ended
	Jun. 25, 2017
Restructuring [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	Restructuring During 2014, we completed a review of initiatives to reduce costs and enhance our competitive position. Based on this review, we committed to a plan to close operations at our Rogers, Arkansas facility, which was completed during the fourth quarter of 2014. The action was undertaken in order to reduce costs and enhance our global competitive position. D uring the fourth quarter of 2016, we sold the Rogers facility for total proceeds of $4.3 million , resulting in a $1.4 million gain on sale, which is recorded as a reduction to selling, general and administrative expense in the consolidated income statements. The total cost incurred as a result of the Rogers facility closure was $16.0 million , of which $0.1 million and $0.2 million was recognized as of June 25, 2017 and June 26, 2016 , respectively. The following table summarizes the Rogers, Arkansas plant closure costs and classification in the consolidated income statement for the period ended June 25, 2017 : (Dollars in thousands) Costs Incurred Through December 31, 2016 Costs Incurred During the Twenty-six Week Period Ended June 25, 2017 Total Costs Classification Accelerated and other depreciation of assets idled $ 7,254 $ 13 $ 7,267 Cost of sales, Restructuring costs Severance costs 2,011 — 2,011 Cost of sales, Restructuring costs Equipment removal and impairment, inventory written-down, lease termination and other costs 6,634 117 6,751 Cost of sales, Restructuring costs 15,899 130 16,029 Gain on sale of the facility (1,436 ) — (1,436 ) Total $ 14,463 $ 130 $ 14,593

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 25, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The company applies fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis, while other assets and liabilities are measured at fair value on a nonrecurring basis, such as 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, investments in certificates of deposit, accounts receivable, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity. Cash and Cash Equivalents Included in cash and cash equivalents are highly liquid investments that are readily convertible to known amounts of cash, and which are subject to an insignificant risk of change in value due to interest rate, quoted price or penalty on withdrawal. A debt security is classified as a cash equivalent if it meets these criteria and if it has a remaining time to maturity of three months or less from the date of acquisition. Amounts on deposit and available upon demand, or negotiated to provide for daily liquidity without penalty, are classified as cash and cash equivalents. Time deposits, certificates of deposit and money market accounts that meet the above criteria are reported at par value on our balance sheet and are excluded from the table below. Derivative Financial Instruments Our derivatives are over-the-counter customized derivative transactions 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. In certain cases, market data may not be available, and we may use broker quotes and models (e.g., Black-Scholes) to determine fair value. This includes situations where there is lack of liquidity for a particular currency or commodity or when the instrument is longer dated. Cash Surrender Value The cash surrender value of the life insurance policies is the sum of money the insurance company will pay to the company in the event the policy is voluntarily terminated before its maturity or the insured event occurs. Over the term of the life insurance contracts, the cash surrender value changes as a result of premium payments and investment income offset by investment losses, charges and miscellaneous fees. The amount of the asset recorded for the investment in the life insurance contracts is equal to the cash surrender value which is the amount that will be realized under the contract as of the balance sheet date if the insured event occurs. The following table categorizes items measured at fair value at June 25, 2017 : Fair Value Measurement at Reporting Date Using Quoted Prices Significant Other Significant in Active Markets Observable Unobservable for Identical Assets Inputs Inputs June 25, 2017 Total (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets Certificates of deposit $ 750 $ — $ 750 $ — Cash surrender value 7,666 — 7,666 — Derivative contracts 10,259 — 10,259 — Total $ 18,675 $ — $ 18,675 $ — Liabilities Derivative contracts $ 6,629 $ — $ 6,629 $ — Total $ 6,629 $ — $ 6,629 $ — The following table categorizes items measured at fair value at December 31, 2016: Fair Value Measurement at Reporting Date Using Quoted Prices Significant Other Significant in Active Markets Observable Unobservable for Identical Assets Inputs Inputs December 31, 2016 Total (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets Certificates of deposit $ 750 $ — $ 750 $ — Cash surrender value 7,480 — 7,480 — Derivative contracts 13 — 13 — Total $ 8,243 $ — $ 8,243 $ — Liabilities Derivative contracts $ 24,773 $ — $ 24,773 $ — Total $ 24,773 $ — $ 24,773 $ —

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 25, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	Financial Instruments 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 of these securities (Level 2 input based on the GAAP fair value hierarchy). The estimated fair value, as well as the carrying value, of the company's debt instruments are shown below (in thousands ): June 25, 2017 (Dollars in thousands) Estimated aggregate fair value $ 762,020 Aggregate carrying value (1) 764,931 (1) Long-term debt excluding the impact of unamortized debt issuance costs. Derivative Instruments and Hedging Activities We use derivatives to partially offset our business exposure to foreign currency risk. 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. To help protect gross margins from fluctuations in foreign currency exchange rates, certain of our subsidiaries whose functional currency is the U.S. dollar hedge a portion of forecasted foreign currency costs. Generally, we may hedge portions of our forecasted foreign currency exposure associated with costs, typically for up to 42 months . We record all derivatives in the condensed consolidated balance sheets at fair value. Our accounting treatment for these instruments is based on the hedge designation. The effective portions of cash flow hedges are recorded in Accumulated Other Comprehensive Income ("AOCI") until the hedged item is recognized in earnings. The ineffective portions of cash flow hedges are recorded in cost of sales. Derivatives that are not designated as hedging instruments are adjusted to fair value through earnings in the financial statement line item to which the derivative relates. All derivatives were designated as hedging instruments at December 31, 2016 . At June 25, 2017 , the company held derivatives that were designated as hedging instruments as well as derivatives that did not qualify for designation as hedging instruments as discussed below. Deferred gains and losses associated with cash flow hedges of foreign currency costs are recognized as a component of cost of sales in the same period as the related cost is recognized. Our foreign currency transactions hedged with cash flow hedges as of June 25, 2017 , are expected to occur within 1 month to 42 months . Derivative instruments designated as cash flow hedges must be de-designated as hedges when it is probable the forecasted hedged transaction will not occur in the initially identified time period or within a subsequent two-month time period. Deferred gains and losses in AOCI associated with such derivative instruments are reclassified immediately into other expense. Any subsequent changes in fair value of such derivative instruments are reflected in other expense unless they are re-designated as hedges of other transactions. Currency option derivative contracts not designated as hedging instruments consist principally of option contracts to purchase Polish Zloty and the Euro related to the acquisition of Uniwheels. See Note 3, "Acquisition." We had $1.5 million and $0.1 million in losses recognized in other expense for foreign currency forward, interest rate swap and aluminum contracts not designated as hedging instruments during the twenty-six week periods ended June 25, 2017 and June 26, 2016 , respectively. The following tables display the fair value of derivatives by balance sheet line item at June 25, 2017 and December 31, 2016 : June 25, 2017 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts and collars designated as hedging instruments $ 4,596 $ 5,125 $ 3,032 $ 1,938 Aluminum forward contracts not designated as hedges 79 — 816 — Interest rate swap contracts not designated as hedges — — — 385 Cross currency swap not designated as hedging instrument 459 — — 459 Total derivative financial instruments $ 5,134 $ 5,125 $ 3,848 $ 2,782 December 31, 2016 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts and collars designated as hedging instruments $ 13 $ — $ 10,076 $ 14,697 Total derivative financial instruments $ 13 $ — $ 10,076 $ 14,697 The following table summarizes the notional amount and estimated fair value of our derivative financial instruments: June 25, 2017 December 31, 2016 Notional U.S. Dollar Amount Fair Value Notional U.S. Dollar Amount Fair Value (Dollars in thousands) Foreign currency forward contracts and collars designated as hedging instruments $ 248,431 $ 4,751 $ (160,461 ) $ (24,760 ) Aluminum forward contracts not designated as hedges (6,558 ) (737 ) — — Interest rate swap contracts not designated as hedges (46,496 ) (385 ) — — Cross currency swap not designated as hedging instrument — — — — Total derivative financial instruments $ 195,377 $ 3,629 $ (160,461 ) $ (24,760 ) Notional amounts are presented on a gross 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 volumes and prices. The following table provides the impact of derivative instruments designated as cash flow hedges on our consolidated income statement: Twenty-six Week Period Ended June 25, 2017 Amount of Gain or (Loss) Recognized in AOCI on Derivatives (Effective Portion) Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income (Effective Portion) Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) (Dollars in thousands) Foreign currency forward contracts and collars $ 27,627 $ (3,582 ) $ (1,451 ) Total $ 27,627 $ (3,582 ) $ (1,451 )

Business Segments

Business Segments	6 Months Ended
	Jun. 25, 2017
Segment Reporting [Abstract]
Business Segments	Business Segments Superior groups its operating segments into reportable segments in which sales and manufacturing efforts are focused. The products, manufacturing, and procurement are similar throughout the company's operations. Each operating segment has discrete financial information evaluated regularly by the company’s Chief Operating Decision Maker (“CODM”) in determining resource allocation and assessing performance. As a result of the Uniwheels acquisition, the company realigned its executive management structure which changed the information used by our CODM to assess performance and allocate resources. Due to different economic circumstances and customer base in the company’s operations and in conformity with ASC Topic 280, “Segment Reporting,” the company reports the results of its business in two reportable segments: North America and Europe. Net Sales and Results of Operations by Reportable Segment Thirteen Weeks Ended Twenty-six Weeks Ended June 25, June 26, June 25, June 26, (Dollars in thousands) Net sales: North America $ 186,898 $ 182,709 $ 361,118 $ 368,774 Europe 53,730 — 53,730 — Consolidated net sales $ 240,628 $ 182,709 $ 414,848 $ 368,774 (Loss) Income from operations: North America $ (1,098 ) $ 19,540 $ 2,846 $ 38,262 Europe (900 ) — (900 ) — Consolidated (loss) income from operations $ (1,998 ) $ 19,540 $ 1,946 $ 38,262 Total Property, Plant and Equipment by Reportable Segment Total property, plant and equipment, net, by reportable segment as follows: June 25, December 31, (Dollars in thousands) Property, plant and equipment, net: North America $ 247,930 $ 227,403 Europe 253,677 — Total assets $ 501,607 $ 227,403

Short-Term Investments

Short-Term Investments	6 Months Ended
	Jun. 25, 2017
Short-term Investments [Abstract]
Cash, Cash Equivalents, and Short-term Investments [Text Block]	Short-Term Investments The company's short-term investments include certificates of deposit and fixed deposits with original maturities of three months or less. Certificates of deposit and fixed deposits whose original maturity is greater than three months and is one year or less are classified as short-term investments and certificates of deposit and fixed deposits whose maturity is greater than one year at the balance sheet date are classified as non-current assets in our condensed consolidated balance sheets. The purchase of any certificates of deposit or fixed deposits that are classified as short-term investments or non-current assets appear in the investing section of our condensed consolidated statements of cash flows. Restricted Deposits We purchase certificates of deposit that mature within twelve months and are used to secure or collateralize letters of credit securing our workers’ compensation obligations. At each of June 25, 2017 and December 31, 2016 , certificates of deposit totaling $0.8 million were restricted in use and were classified as short-term investments on our condensed consolidated balance sheets.

Inventories

Inventories	6 Months Ended
	Jun. 25, 2017
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	Inventories June 25, 2017 December 31, 2016 (Dollars in thousands) Raw materials $ 62,168 $ 40,255 Work in process 47,724 21,447 Finished goods 62,731 21,135 Inventories $ 172,623 $ 82,837 Service wheel and supplies inventory included in other non-current assets in the condensed consolidated balance sheets totaled $7.7 million and $6.5 million at June 25, 2017 and December 31, 2016 , respectively. Included in raw materials were operating supplies and spare parts totaling $14.3 million and $10.3 million on June 25, 2017 and December 31, 2016 , respectively. Included within inventory is $81.7 million from European operations.

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 25, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment June 25, 2017 December 31, 2016 (Dollars in thousands) Land and buildings $ 134,030 $ 67,915 Machinery and equipment 681,324 485,185 Leasehold improvements and others 10,539 4,868 Construction in progress 46,534 26,301 872,427 584,269 Accumulated depreciation (370,820 ) (356,866 ) Property, plant and equipment, net $ 501,607 $ 227,403 Depreciation expense was $19.5 million and $17.3 million for the twenty-six weeks ended June 25, 2017 and June 26, 2016 , respectively.

Ppre-Production Costs Related t

Ppre-Production Costs Related to Long-Term Supply Arrangement	6 Months Ended
	Jun. 25, 2017
Pre-Production Costs and Deferred Revenue Related to Long-Term Supply Arrangements [Abstract]
PreProductionCostsandDeferredRevenueRelatedtoLongTermSupplyArrangements [Text Block]	Preproduction Costs Related to Long-Term Supply Arrangements We incur preproduction engineering and tooling costs related to the products produced for our customers under long-term supply agreements. We expense all preproduction engineering costs for which reimbursement is not contractually guaranteed by the customer or which are in excess of the contractually guaranteed reimbursement amount. We amortize the cost of the customer-owned tooling over the expected life of the wheel program on a straight-line basis. Also, we defer any reimbursements made to us by our customers and recognize the tooling reimbursement revenue over the same period in which the tooling is in use. Changes in the facts and circumstances of individual wheel programs may accelerate the amortization of both the cost of customer-owned tooling and the deferred tooling reimbursement revenues. Recognized tooling reimbursement revenues, which totaled $3.5 million and $3.9 million for the twenty-six weeks ended June 25, 2017 and June 26, 2016 , respectively, are included in net sales in the condensed consolidated statements of operations. The following tables summarize the unamortized customer-owned tooling costs included in our non-current assets, and the deferred tooling revenues included in accrued expenses and other non-current liabilities: June 25, 2017 December 31, 2016 (Dollars in thousands) Customer-Owned Tooling Costs Preproduction costs $ 81,912 $ 78,299 Accumulated amortization (68,216 ) (65,100 ) Net preproduction costs $ 13,696 $ 13,199 Deferred Tooling Revenues Accrued expenses $ 3,316 $ 5,419 Other non-current liabilities 5,341 2,593 Total deferred tooling revenues $ 8,657 $ 8,012

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 25, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill and indefinite-lived assets, such as certain trade names acquired in connection with the acquisition of Uniwheels on May 30, 2017, are not amortized, but are instead evaluated for impairment on an annual basis at the end of the fiscal year, or more frequently if events or circumstances indicate that impairment may be more likely. During the thirteen weeks ended June 25, 2017, no impairment charges have been taken against the company’s goodwill or indefinitely-lived intangible assets. The carrying amount of goodwill arose from the Acquisition described in Note 3, "Acquisition". The company’s other intangible assets primarily consist of assets with finite lives and are amortized over their estimated useful lives. These 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 as of June 25, 2017. There were no such intangible assets at December 31, 2016. Gross Carrying Amount Accumulated Amortization Currency Translation Net Remaining Weighted Average Amortization Period (Dollars in thousands Brand name $ 9,000 $ (150 ) $ 132 $ 8,982 5-6 Technology 16,000 (222 ) 235 16,013 4-6 Customer relationships 167,000 (1,799 ) 2,465 167,666 6-11 Total finite 192,000 (2,171 ) 2,832 192,661 Trade names 20,000 — 300 20,300 Indefinite Total $ 212,000 $ (2,171 ) $ 3,132 $ 212,961 Amortization expense for these intangible assets was $2.2 million and $0 for the thirteen and twenty-six week periods ended June 25, 2017 and June 26, 2016, respectively. The anticipated annual amortization expense for these intangible assets is $26.3 million for 2018 to 2021 and $24.4 million for 2022.

Redeemable Preferred Share

Redeemable Preferred Share	6 Months Ended
	Jun. 25, 2017
Temporary Equity Disclosure [Abstract]
Redeemable Preferred Share	Redeemable Preferred Shares On March 22, 2017, Superior and TPG Growth III Sidewall, L.P. ("TPG") entered into an Investment Agreement pursuant to which Superior agreed to issue a number of shares of Series A Perpetual Convertible Preferred Stock and Series B Perpetual Preferred Stock to TPG for an aggregate purchase price of $150.0 million . On May 22, 2017, Superior issued 140,202 shares of Series A Perpetual Convertible Preferred Stock and 9,798 shares of Series B Perpetual Preferred Stock to TPG, both with a $1,000 stated value per share. The Series A Perpetual Convertible Preferred Stock has a stated value of $1,000 per share, par value of $0.01 per share and liquidation preference over common stock. The Series B Perpetual Preferred Stock has a stated value of $1,000 per share, par value of $0.01 per share, and liquidation preference over Superior common stock. The Series A Perpetual Convertible Preferred Stock is convertible into Superior common stock into a 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 Series B Perpetual Preferred Stock is not convertible into Superior common stock until Superior’s stockholders approve the conversion of the Series B Perpetual Preferred Stock into Series A Perpetual Convertible Preferred Stock. The Series A Perpetual Convertible Preferred Stock and Series B Perpetual Preferred Stock will accrue dividends at a rate of 9 percent per annum, payable at Superior’s election either in-kind or in cash, provided that the Series B Perpetual Preferred Stock will accrue dividends at a rate of 11 percent per annum, payable at Superior’s election either in-kind or in cash, if stockholder approval is not obtained by September 19, 2017. Superior has undertaken to hold a special meeting of stockholders by that date for the purposes of approving the conversion of the Series B Preferred Stock into Series A Preferred Stock. In addition to the dividends, the Series A Perpetual Convertible Preferred Stock and Series B Perpetual Preferred Stock are 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. In addition, on May 22, 2017, Superior’s Board of Directors increased its size from eight to nine directors and appointed Ransom A. Langford, TPG’s designee, as a director. The company may mandate conversion of the Series A Perpetual Convertible Preferred Stock if the price of the common stock exceeds $84 . TPG may redeem their shares upon the occurrence of a change in control, recapitalization, merger, sale of substantially all of the company’s assets, liquidation or delisting of the company’s common stock. At its option, TPG may redeem the shares at any time after May 23, 2024. If redeemed by Superior, the redemption value would be $262.5 million ( 1.75 times stated value) if redeemed on or before October 22, 2018. If redeemed after October 22, 2018, the redemption value would be the greater of $300 million ( 2.0 times stated value) or the product of the number of common shares into which the preferred stock could be converted ( 5.3 million shares currently) and the then current market price of the common stock.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 25, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share In accordance with U.S. GAAP, basic earnings per share is computed by dividing net (loss) income, less preferred dividends, for the period by the weighted average number of common shares outstanding for the period. For purposes of calculating diluted earnings per share, net income is divided by the total of the weighted average shares outstanding plus the dilutive effect of our redeemable preferred stock, outstanding stock options and time and performance based restricted stock units under the treasury stock method, which includes consideration of stock-based compensation required by U.S. GAAP. (Dollars and shares in thousands, except per share amounts) Thirteen Weeks Ended Twenty-six Weeks Ended June 25, June 26, June 25, June 26, Basic Income Per Share: Reported net (loss) income $ (7,272 ) $ 13,165 $ (4,170 ) $ 27,628 Less: Redeemable preferred stock dividends (2,882 ) — (2,882 ) — Basic numerator $ (10,154 ) $ 13,165 $ (7,052 ) $ 27,628 Basic (loss) income per share $ (0.41 ) $ 0.52 $ (0.28 ) $ 1.08 Weighted average shares outstanding-Basic 24,908 25,430 24,961 25,512 Diluted Income Per Share: Reported net (loss) income $ (7,272 ) $ 13,165 $ (4,170 ) $ 27,628 Less: Redeemable preferred stock dividends (2,882 ) — (2,882 ) — Basic numerator $ (10,154 ) $ 13,165 $ (7,052 ) $ 27,628 Diluted (loss) income per share $ (0.41 ) $ 0.52 $ (0.28 ) $ 1.08 Weighted average shares outstanding-Basic 24,908 25,430 24,961 25,512 Weighted average dilutive stock options and restricted stock units — 113 — 75 Weighted average shares outstanding-Diluted 24,908 25,543 24,961 25,587 For the first half of 2017, no options were included in the diluted earnings per share calculation because to do so would have been anti-dilutive. The performance shares discussed in Note 19, "Stock-Based Compensation" are not included in the diluted earnings per share because the performance metrics had not been met as of the period ended June 25, 2017 . The redeemable preferred shares discussed in Note 13, "Redeemable Preferred Shares" are not included in the diluted earnings per share because the conversion would be anti-dilutive as of the period ended June 25, 2017 .

Income Taxes

Income Taxes	6 Months Ended
	Jun. 25, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The estimated annual effective tax rate is forecasted quarterly using actual historical information and forward-looking estimates and applied to year-to-date ordinary income (loss). The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances, settlements with taxing authorities and effects of changes in tax laws or rates, are reported in the interim period in which they occur. The income tax benefit for the twenty-six weeks ended June 25, 2017 , was $1.5 million on a pre-tax loss of $(5.9) million , representing an effective income tax rate of 25.6 percent . The effective tax rate for the twenty-six weeks ended June 25, 2017 was lower than the statutory rate due to non-deductible transaction costs related to the tender offer and acquisition of Uniwheels, and due to earnings in countries with tax rates lower than the U.S. statutory rate. The income tax provision for the twenty-six weeks ended June 26, 2016 , was $10.6 million , representing an effective income tax rate of 28.0 percent . The effective tax rate for the twenty-six weeks ended June 26, 2016 were lower than the statutory rate due to earnings in countries with tax rates lower than the U.S. statutory rate.

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 25, 2017
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	Retirement Plans We have an unfunded salary continuation plan covering certain directors, officers and other key members of management. We purchase life insurance policies on certain participants to provide, in part, for future liabilities. Cash surrender value of these policies, totaling $7.7 million and $7.5 million at June 25, 2017 and December 31, 2016 , respectively, are included in other non-current assets in the company's condensed consolidated balance sheets. 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. We have measured the plan assets and obligations of our salary continuation plan for all periods presented. For the twenty-six weeks ended June 25, 2017 , payments to retirees or their beneficiaries totaled approximately $0.7 million . We presently anticipate benefit payments in 2017 to total approximately $1.5 million . The following table summarizes the components of net periodic pension cost for the first half of 2017 and 2016 . Thirteen Weeks Ended Twenty-six Weeks Ended June 25, 2017 June 26, 2016 June 25, 2017 June 26, 2016 (Dollars in thousands) Service cost $ — $ — $ — $ — Interest cost 298 304 596 608 Net amortization 67 84 134 168 Net periodic pension cost $ 365 $ 388 $ 730 $ 776

Debt

Debt	6 Months Ended
	Jun. 25, 2017
Debt Disclosure [Abstract]
Debt	Debt A summary of long-term debt and the related weighted average interest rates is shown below (in thousands): June 25, 2017 Debt Instrument Long-Term Debt Debt Issuance Costs (1) Long-Term Debt, Net Weighted Average Interest Rate Term loan facility $ 388,800 $ (13,465 ) $ 375,335 4.8% 6.00% Senior Notes due 2025 279,051 (8,117 ) 270,934 6.0% Other 97,080 (3,493 ) 93,587 2.1% $ 764,931 $ (25,075 ) 739,856 Less: Current portion (18,800 ) Long-term debt $ 721,056 (1) Unamortized portion Senior Notes On June 15, 2017, Superior issued €250.0 million aggregate principal amount of 6.0% Senior Notes (the "Notes") due June 15, 2025. Interest on the Notes is payable semiannually, June 15 and December 25. Superior may redeem the Notes, in whole or in part, on or after June 15, 2020 at redemption prices of 103.000% and 101.500% 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% 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. In addition, the Company may redeem some or all of the Notes prior to June 15, 2020 at a price equal to 100.0% of the principal amount thereof plus a “make-whole” premium and accrued and unpaid interest, if any, to, but not including, the redemption date. Prior to June 15, 2020, the company may redeem up to 40% of the aggregate principal amount of the Notes using the proceeds of certain equity offerings at a certain redemption price. 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 will be effectively subordinated in right of payment to the existing and future secured indebtedness of the Issuer, including the Senior Secured Credit Facilities (as defined below), to the extent of the assets securing such indebtedness. Guarantee The Notes are unconditionally guaranteed by all material wholly-owned direct and indirect domestic restricted subsidiaries of the company, 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 a number of 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) breach of covenants in the indenture; (iii) 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% 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 a number of important qualifications, limitations and exceptions that are described in the indenture. As of June 25, 2017, the Company was in compliance with all covenants under the indentures 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, JP Morgan Chase N.A., Royal Bank of Canada and Deutsche Bank A.G. New York Branch (collectively, the "Lenders"). The Credit Agreement consisted of a $400.0 million senior secured term loan facility and a $160 million revolving credit facility (the "Senior Secured Credit Facilities"). 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 reserve requirements, subject to a floor of 1.00% per annum, plus an applicable rate of 4.50% or (b) a base rate, subject to a floor of 2.00% 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% and (3) LIBOR for an interest period of one month plus 1.00% , in each case, plus an applicable rate of 3.50% . Borrowings under the revolving credit facility initially bear interest at a rate of equal to, at the company’s option, either (a) LIBOR for the relevant interest period, adjusted for statutory reserve requirements, subject to a floor of 1.00% per annum, plus an applicable rate of 3.50% or (b) a base rate, subject to a floor of 2.00% 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 effective rate plus 0.50% and (3) LIBOR for an interest period of one month plus 1.00% , in each case, plus an applicable rate of 3.50% provided such rate may not be less than zero. The initial commitment fee for unused commitments under the revolving credit facility shall be 0.50% . After September 30, 2017, the applicable rates for borrowings under the revolving credit facility and commitment fees for unused commitments under the revolving credit facility shall be based upon the First Lien Net Leverage Ratio effective for the preceding quarter with LIBOR applicable rates between 3.50% and 3.00% , base rate applicable rates between 2.50% and 2.00% and commitment fees between .50% and .25% . Commitment fees are included in our condensed consolidated financial statements line, interest (expense) income, net. On June 25, 2017, the company repaid $11.2 million under the term loan facility resulting in a balance of $388.8 million . As of June 25, 2017, the company had outstanding borrowings under the revolving credit facility of $27.6 million and letters of credit of $2.8 million , and had available unused commitments under the facility of $129.6 . The balance outstanding under the revolving credit facility is included in the debt table under "Other obligations". Guarantees Our obligations under the Credit Agreement are unconditionally guaranteed by all material wholly-owned direct and indirect domestic restricted subsidiaries of the company, 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 our assets and the guarantors’ assets, including but not limited to: (i) a perfected pledge of all of the capital stock issued by each of the Issuer’s direct wholly-owned domestic restricted subsidiaries or any guarantor (subject to certain exceptions) and up to 65 percent of the capital stock issued by each direct wholly-owned foreign restricted subsidiary of the Issuer 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 guarantors (subject to certain exceptions and exclusions). Covenants The Senior Secured Credit Facilities contain a number of 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 or other restricted payments, pay dividends and distributions 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 non-Guarantor restricted subsidiaries to pay dividends or make other payments to us, and enter into certain transactions with our affiliates. In addition, the Credit Agreement contains customary default provisions, representations and warranties and restrictive covenants. The Credit Agreement also contains a provision permitting the Lenders to accelerate the repayment of all loans outstanding under the Senior Secured Credit Facilities during an event of default. As of June 25, 2017, the company was in compliance with all covenants under the Credit Agreement. Uniwheels Debt In connection with the acquisition of Uniwheels, the company assumed $70.7 million of debt outstanding at the time of the acquisition. At June 25, 2017, $69.5 million of debt remained outstanding, including a term loan agreement, an equipment loan and a revolving line of credit. At June 25, 2017, $18.8 million of this debt was classified as current. The term loan and revolving credit facilities bear interest at Euribor plus 1.00 percent and the equipment loan bears interest at 1.00 percent . As part of the debt issued to finance the Acquisition, Superior deposited funds into a restricted cash account for the use in repayment of the Uniwheels’ term loan in accordance with requirements under the Senior Secured Credit Facility.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 25, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Derivatives and Purchase Commitments In order to hedge exposure related to fluctuations in foreign currency rates and the cost of certain commodities used in the manufacture of our products, we periodically may purchase derivative financial instruments such as forward contracts, options or collars to offset or mitigate the impact of such fluctuations. Programs to hedge currency rate exposure may address ongoing transactions including foreign-currency-denominated receivables and payables, as well as specific transactions related to purchase obligations. Programs to hedge exposure to commodity cost fluctuations would be based on underlying physical consumption of such commodities. In accordance with our corporate risk management policies, we may enter into foreign currency forward and option contracts with financial institutions to protect against foreign exchange risks associated with certain existing assets and liabilities, certain firmly committed transactions and forecasted future cash flows. We have implemented a program to hedge a portion of our material foreign exchange exposures for up to approximately 42 months . For additional information on our derivatives, see Note 6, "Financial Instruments". When market conditions warrant, we may also 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. At June 25, 2017 , we did not have any purchase commitments in place for the delivery of aluminum, natural gas or other raw materials in 2017 . Other 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.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 25, 2017
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation 2008 Equity Incentive Plan Our 2008 Equity Incentive Plan, as amended (the "Plan"), authorizes us to issue up to 3.5 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 June 25, 2017 , there were 1.7 million shares available for future grants under this Plan. No more than 600,000 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. During the first quarter of 2015 , the company implemented a long term incentive program for the benefit of certain members of company management. The program was designed to strengthen employee retention and to provide a more structured incentive program to stimulate improvement in future company results. Per the terms of the program, participants were granted, in 2015 to 2017 , time value restricted stock units (“RSUs”), vesting ratably over a three year time period, and performance restricted stock units (“PSUs”), with a three year cliff vesting. Upon vesting, each restricted stock award is exchangeable for one share of the company’s common stock, with accrued dividends. The PSUs are categorized further into three individual categories whose vesting is contingent upon the achievement of certain targets as follows: • 40 % of the PSUs vest upon certain Return on Invested Capital targets for 2015 to 2017 units • 40 % of the PSUs vest upon certain Cumulative EPS targets for 2016 to 2017 units • 40 % of the PSUs vest upon certain EBITDA margin targets for 2015 units • 20 % of the PSUs vest upon certain market based Shareholder Return targets for 2015 to 2017 units. Options Options are granted at not less than fair market value on the date of grant and expire no later than ten years after the date of grant. Options and restricted shares granted under this Plan generally require no less than a three year ratable vesting period. Stock option activity in the first half of 2017 are summarized in the following table: Outstanding Weighted Average Exercise Price Remaining Contractual Life in Years Aggregate Intrinsic Value Balance at December 31, 2016 231,625 $ 18.88 3.1 $ 1,845,263 Granted — $ — Exercised — $ — Canceled (3,000 ) $ 19.62 Expired — $ — Balance at June 25, 2017 228,625 $ 18.87 Options vested or expected to vest at June 25, 2017 228,625 $ 18.87 2.6 $ 375,530 Exercisable at June 25, 2017 228,625 $ 18.87 2.6 $ 375,530 Restricted Stock Awards Restricted stock awards, or “full value” awards, generally vest ratably over no less than a three year period. Shares of restricted stock granted under the Plan are considered issued and outstanding at the date of grant, have the same dividend and voting rights as other outstanding common stock, are subject to forfeiture if employment terminates prior to vesting and are expensed ratably over the vesting period. Dividends paid on the restricted shares granted under the Plan are non-forfeitable if the restricted shares do not ultimately vest. Restricted stock activity in the first half of 2017 are summarized in the following table: Number of Awards Weighted Average Grant Date Fair Value Weighted Average Remaining Amortization Period (in Years) Balance at December 31, 2016 144,295 $ 19.43 0.5 Granted — $ — Vested (132,455 ) $ 19.44 Canceled (417 ) $ 19.16 Balance at June 25, 2017 11,423 $ 19.30 0.2 Restricted Stock Units Restricted stock unit activity in the first half of 2017 is summarized in the following table: Number of Awards Weighted Average Grant Date Fair Value Weighted Average Remaining Amortization Period (in Years) Balance at December 31, 2016 127,567 $ 22.03 1.7 Granted 80,288 $ 24.12 Vested (37,660 ) $ 23.69 Canceled (10,571 ) $ 22.90 Balance at June 25, 2017 159,624 $ 22.64 1.9 Restricted Performance Stock Units Restricted performance stock unit activity in the first half of 2017 is summarized in the following table: Number of Awards Weighted Average Grant Date Fair Value Weighted Average Remaining Amortization Period (in Years) Balance at December 31, 2016 227,193 $ 21.72 1.6 Granted 118,157 $ 23.90 Vested — $ — Canceled (29,921 ) $ 22.45 Balance at June 25, 2017 315,429 $ 22.47 2.0 Stock-Based Compensation Stock-based compensation expense related to our equity incentive plans in accordance with U.S. GAAP was allocated as follows: Thirteen Weeks Ended Twenty-six Weeks Ended June 25, June 26, June 25, June 26, (Dollars in thousands) Cost of sales $ (138 ) $ 282 $ 49 $ 358 Selling, general and administrative expenses (154 ) 1,476 938 1,956 Stock-based compensation expense before income taxes (292 ) 1,758 987 2,314 Income tax benefit 108 (515 ) (364 ) (648 ) Total stock-based compensation expense after income taxes $ (184 ) $ 1,243 $ 623 $ 1,666 As of June 25, 2017 , a total of $5.8 million of unrecognized compensation cost related to non-vested awards is expected to be recognized over a weighted average period of approximately 1.9 years . There were no significant capitalized stock-based compensation costs at June 25, 2017 and December 31, 2016 .

Common Stock Repurchase Program

Common Stock Repurchase Programs	6 Months Ended
	Jun. 25, 2017
Common Stock Repurchase Programs [Abstract]
Common Stock Repurchase Programs	Common Stock Repurchase Programs In October 2014, our Board of Directors approved a stock repurchase program (the "2014 Repurchase Program") which authorized the repurchase of up to $30.0 million of our common stock. Under the 2014 Repurchase Program, we repurchased common stock from time to time on the open market or in private transactions. Shares repurchased under the 2014 Repurchase Program totaled 1,056,954 shares at a cost of $19.6 million . The 2014 Repurchase Program was completed in the beginning of 2016, with purchases of 585,970 shares for a cost of $10.3 million . The repurchased shares described above were either canceled and retired or added to treasury stock after the reincorporation in Delaware in 2015. In January of 2016, our Board of Directors approved another stock repurchase program (the “2016 Repurchase Program”), authorizing the repurchase of up to $50.0 million of common stock. Under the 2016 Repurchase Program, we may repurchase common stock from time to time on the open market or in private transactions. The timing and extent of the repurchases under the 2016 Repurchase Program will depend upon market conditions and other corporate considerations in our sole discretion. Shares repurchased under the 2016 Repurchase Program totaled 137,699 shares of company stock at a cost of $2.8 million in the first half of 2016. Shares repurchased under the 2016 Repurchase Program totaled 215,841 shares of company stock at a cost of $5.0 million in the first half of 2017 . Superior does not anticipate any repurchases under the 2016 Repurchase Program in the near term.

Presentation of Condensed Con29

Presentation of Condensed Consolidated Financial Statements (Policies)	6 Months Ended
	Jun. 25, 2017
Accounting Policies [Abstract]
Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block]	Financial Instruments 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 of these securities (Level 2 input based on the GAAP fair value hierarchy). The estimated fair value, as well as the carrying value, of the company's debt instruments are shown below (in thousands ): June 25, 2017 (Dollars in thousands) Estimated aggregate fair value $ 762,020 Aggregate carrying value (1) 764,931 (1) Long-term debt excluding the impact of unamortized debt issuance costs. Derivative Instruments and Hedging Activities We use derivatives to partially offset our business exposure to foreign currency risk. 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. To help protect gross margins from fluctuations in foreign currency exchange rates, certain of our subsidiaries whose functional currency is the U.S. dollar hedge a portion of forecasted foreign currency costs. Generally, we may hedge portions of our forecasted foreign currency exposure associated with costs, typically for up to 42 months . We record all derivatives in the condensed consolidated balance sheets at fair value. Our accounting treatment for these instruments is based on the hedge designation. The effective portions of cash flow hedges are recorded in Accumulated Other Comprehensive Income ("AOCI") until the hedged item is recognized in earnings. The ineffective portions of cash flow hedges are recorded in cost of sales. Our foreign currency transactions hedged with cash flow hedges as of June 25, 2017 , are expected to occur within 1 month to 42 months . Derivative instruments designated as cash flow hedges must be de-designated as hedges when it is probable the forecasted hedged transaction will not occur in the initially identified time period or within a subsequent two-month time period. Deferred gains and losses in AOCI associated with such derivative instruments are reclassified immediately into other expense. Any subsequent changes in fair value of such derivative instruments are reflected in other expense unless they are re-designated as hedges of other transactions. Currency option derivative contracts not designated as hedging instruments consist principally of option contracts to purchase Polish Zloty and the Euro related to the acquisition of Uniwheels. See Note 3, "Acquisition." We had $1.5 million and $0.1 million in losses recognized in other expense for foreign currency forward, interest rate swap and aluminum contracts not designated as hedging instruments during the twenty-six week periods ended June 25, 2017 and June 26, 2016 , respectively. Deferred gains and losses associated with cash flow hedges of foreign currency costs are recognized as a component of cost of sales in the same period as the related cost is recognized.
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block]	Derivatives that are not designated as hedging instruments are adjusted to fair value through earnings in the financial statement line item to which the derivative relates.
Fair Value Measurement, Policy [Policy Text Block]	Fair Value Measurements The company applies fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis, while other assets and liabilities are measured at fair value on a nonrecurring basis, such as 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.
Basis of Accounting, Policy [Policy Text Block]	During interim periods, we follow the accounting policies set forth in our Annual Report on Form 10-K for the fiscal year ended December 25, 2016 (the "2016 Annual Report on Form 10-K") and apply appropriate interim financial reporting standards for a fair statement of our operating results and financial position in conformity with accounting principles generally accepted in the United States of America, as codified by the Financial Accounting Standards Board ("FASB") in the Accounting Standards Codification ("ASC") (referred to herein as "U.S. GAAP"), as indicated below. For convenience of presentation, the 2016 fiscal year is referred to as December 31, but actually reflects our financial position and results of operations for the period described below. Users of financial information produced for interim periods in 2017 are encouraged to read this Quarterly Report on Form 10-Q in conjunction with our consolidated financial statements and notes thereto filed with the Securities and Exchange Commission ("SEC") in our 2016 Annual Report on Form 10-K. We use a 4-4-5 convention for our fiscal quarters, which are thirteen week periods generally ending on the last Sunday of each calendar quarter. We refer to these thirteen week fiscal periods as “quarters” throughout this report. Uniwheels uses a regular calendar close with months ending on the last day of the month. Therefore, during the second and third quarters there will be a slight difference in timing of close, but the year ends will align on December 31, 2017. Thereafter, we will go to a consolidated close with each month ending on the last day of the month. The slight difference in timing is not considered to be significant to the consolidated financial statements. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the SEC’s requirements for quarterly reports on Form 10-Q and U.S. GAAP and, in our opinion, contain all adjustments, of a normal and recurring nature, which are necessary for a fair statement of (i) the condensed consolidated statements of operations for the thirteen and twenty-six week period ended June 25, 2017 , (ii) the condensed consolidated statements of comprehensive income for the thirteen and twenty-six week period ended June 25, 2017 , (iii) the condensed consolidated balance sheets at June 25, 2017 and December 31, 2016 , (iv) the condensed consolidated statements of cash flows for the twenty-six week period ended June 25, 2017 , and (v) the condensed consolidated statement of shareholders’ equity for the twenty-six week period ended June 25, 2017 . However, the accompanying unaudited condensed consolidated financial statements do not include all information and notes required by U.S. GAAP. The condensed consolidated balance sheet as of December 31, 2016 , included in this report, was derived from our 2016 audited financial statements but does not include all disclosures required by U.S. GAAP.
Use of Estimates, Policy [Policy Text Block]	Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time, including the use of estimated effective tax rates. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results.
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share In accordance with U.S. GAAP, basic earnings per share is computed by dividing net (loss) income, less preferred dividends, for the period by the weighted average number of common shares outstanding for the period. For purposes of calculating diluted earnings per share, net income is divided by the total of the weighted average shares outstanding plus the dilutive effect of our redeemable preferred stock, outstanding stock options and time and performance based restricted stock units under the treasury stock method, which includes consideration of stock-based compensation required by U.S. GAAP.
Cash and Cash Equivalents, Policy [Policy Text Block]	The company's short-term investments include certificates of deposit and fixed deposits with original maturities of three months or less. Certificates of deposit and fixed deposits whose original maturity is greater than three months and is one year or less are classified as short-term investments and certificates of deposit and fixed deposits whose maturity is greater than one year at the balance sheet date are classified as non-current assets in our condensed consolidated balance sheets.
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	New Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update ("ASU") “Revenue from Contracts with Customers.” This update outlines a single, comprehensive model for accounting for revenue from contracts with customers. We plan to adopt this update on January 1, 2018. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). We anticipate adopting the standard using the modified retrospective method. There may be differences in timing of revenue recognition under the new standard compared to recognition under ASC 605 - Revenue Recognition. In July 2015, the FASB issued an ASU entitled “Simplifying the Measurement of Inventory.” The ASU replaces the current lower of cost or market test with a lower of cost or net realizable value test when cost is determined on a first-in, first-out or average cost basis. The standard is effective for public entities for annual reporting periods beginning after December 15, 2016 and interim periods therein. It was applied prospectively in the first quarter of 2017 and the adoption of this ASU had no impact on our financial position and statement of operations. In February of 2016, the FASB issued ASU 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 requires an entity to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. ASU 2016-02 offers specific accounting guidance for a lessee, a lessor and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. For public companies, ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and requires a modified retrospective adoption, with early adoption permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In March 2016, the FASB issued an ASU entitled "Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." The objective of the ASU is to simplify several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The adoption of this ASU in the first quarter of 2017 had no significant impact on our financial position and statement of operations. Also, certain disclosures in the statement of cash flows were modified in accordance with this ASU. In August 2016, the FASB issued an ASU entitled "Statement of Cash Flows (Topic 740): Classification of Certain Cash Receipts and Cash Payments." The objective of the ASU is to address the diversity in practice in the presentation of certain cash receipts and cash payments in the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our statement of cash flows. In October 2016, the FASB issued an ASU entitled "Income Taxes (Topic 230): Intra-Entity Transfers of Assets Other than Inventory." The objective of the ASU is to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In November 2016, the FASB issued an ASU entitled "Statement of Cash Flows (Topic 230): Restricted Cash." The objective of the ASU is to address the diversity in practice that exists in the classification and presentation of changes in restricted cash on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our statement of cash flows. In January 2017, the FASB issued an ASU entitled "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment." The objective of the ASU is to simplify how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In January 2017, the FASB issued an ASU entitled "Business Combinations (Topic 805): Clarifying the Definition of a Business." The objective of the ASU is to add guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations. In March 2017, the FASB issued an ASU entitled "Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." The objective of the ASU is to improve the reporting of net benefit cost in the financial statements. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. We are evaluating the impact this guidance will have on our financial position and statement of operations.

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Jun. 25, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	During the second quarter of 2017, the company determined a preliminary valuation of the identifiable assets acquired and the liabilities assumed. The following is the allocation of the purchase price: (Dollars in thousands) Estimated purchase price Cash consideration $ 703,000 Non-controlling interest 63,200 Preliminary purchase price allocation Cash and cash equivalents 12,296 Accounts receivable 60,580 Inventories 82,402 Prepaid expenses and other current assets 11,479 Total current assets 166,757 Property and equipment 250,000 Intangible assets (1) 212,000 Goodwill 306,154 Other assets 20,937 Total assets acquired 955,848 Accounts payable 61,883 Other current liabilities 40,361 Total current liabilities 102,244 Other long-term liabilities 87,404 Total liabilities assumed 189,648 Net assets acquired $ 766,200 (1) Intangible assets are recorded at estimated fair value, as determined by management based on available information which includes a preliminary valuation prepared by an independent third party. The fair values assigned to identifiable intangible assets were determined through the use of the income approach, specifically the relief from royalty and multi-period excess earnings methods. The major assumptions used in arriving at the estimated identifiable intangible asset values included management’s estimates of future cash flows, discounted at an appropriate rate of return which are based on the weighted average cost of capital for both the company and other market participants. The useful lives for intangible assets were determined based upon the remaining useful economic lives of the intangible assets that are expected to contribute directly or indirectly to future cash flows. The estimated fair value of intangible assets and related useful lives as included in the preliminary purchase price allocation include: Estimated Fair Value Estimated Useful Life (in Years) (Dollars in thousands) Brand name $ 9,000 5-6 Technology 16,000 4-6 Customer relationships 167,000 6-11 Trade names 20,000 Indefinite $ 212,000
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The estimated fair value of intangible assets and related useful lives as included in the preliminary purchase price allocation include: Estimated Fair Value Estimated Useful Life (in Years) (Dollars in thousands) Brand name $ 9,000 5-6 Technology 16,000 4-6 Customer relationships 167,000 6-11 Trade names 20,000 Indefinite $ 212,000

Restructuring (Tables)

Restructuring (Tables)	6 Months Ended
	Jun. 25, 2017
Restructuring [Abstract]
Restructuring and Related Costs [Table Text Block]	Restructuring During 2014, we completed a review of initiatives to reduce costs and enhance our competitive position. Based on this review, we committed to a plan to close operations at our Rogers, Arkansas facility, which was completed during the fourth quarter of 2014. The action was undertaken in order to reduce costs and enhance our global competitive position. D uring the fourth quarter of 2016, we sold the Rogers facility for total proceeds of $4.3 million , resulting in a $1.4 million gain on sale, which is recorded as a reduction to selling, general and administrative expense in the consolidated income statements. The total cost incurred as a result of the Rogers facility closure was $16.0 million , of which $0.1 million and $0.2 million was recognized as of June 25, 2017 and June 26, 2016 , respectively. The following table summarizes the Rogers, Arkansas plant closure costs and classification in the consolidated income statement for the period ended June 25, 2017 : (Dollars in thousands) Costs Incurred Through December 31, 2016 Costs Incurred During the Twenty-six Week Period Ended June 25, 2017 Total Costs Classification Accelerated and other depreciation of assets idled $ 7,254 $ 13 $ 7,267 Cost of sales, Restructuring costs Severance costs 2,011 — 2,011 Cost of sales, Restructuring costs Equipment removal and impairment, inventory written-down, lease termination and other costs 6,634 117 6,751 Cost of sales, Restructuring costs 15,899 130 16,029 Gain on sale of the facility (1,436 ) — (1,436 ) Total $ 14,463 $ 130 $ 14,593

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 25, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	The following table categorizes items measured at fair value at December 31, 2016: Fair Value Measurement at Reporting Date Using Quoted Prices Significant Other Significant in Active Markets Observable Unobservable for Identical Assets Inputs Inputs December 31, 2016 Total (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets Certificates of deposit $ 750 $ — $ 750 $ — Cash surrender value 7,480 — 7,480 — Derivative contracts 13 — 13 — Total $ 8,243 $ — $ 8,243 $ — Liabilities Derivative contracts $ 24,773 $ — $ 24,773 $ — Total $ 24,773 $ — $ 24,773 $ —

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jun. 25, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
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 ): June 25, 2017 (Dollars in thousands) Estimated aggregate fair value $ 762,020 Aggregate carrying value (1) 764,931 (1) Long-term debt excluding the impact of unamortized debt issuance costs.
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following tables display the fair value of derivatives by balance sheet line item at June 25, 2017 and December 31, 2016 : June 25, 2017 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts and collars designated as hedging instruments $ 4,596 $ 5,125 $ 3,032 $ 1,938 Aluminum forward contracts not designated as hedges 79 — 816 — Interest rate swap contracts not designated as hedges — — — 385 Cross currency swap not designated as hedging instrument 459 — — 459 Total derivative financial instruments $ 5,134 $ 5,125 $ 3,848 $ 2,782 December 31, 2016 Other Current Assets Other Non-current Assets Accrued Liabilities Other Non-current Liabilities (Dollars in thousands) Foreign exchange forward contracts and collars designated as hedging instruments $ 13 $ — $ 10,076 $ 14,697 Total derivative financial instruments $ 13 $ — $ 10,076 $ 14,697
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The following table summarizes the notional amount and estimated fair value of our derivative financial instruments: June 25, 2017 December 31, 2016 Notional U.S. Dollar Amount Fair Value Notional U.S. Dollar Amount Fair Value (Dollars in thousands) Foreign currency forward contracts and collars designated as hedging instruments $ 248,431 $ 4,751 $ (160,461 ) $ (24,760 ) Aluminum forward contracts not designated as hedges (6,558 ) (737 ) — — Interest rate swap contracts not designated as hedges (46,496 ) (385 ) — — Cross currency swap not designated as hedging instrument — — — — Total derivative financial instruments $ 195,377 $ 3,629 $ (160,461 ) $ (24,760 )
Derivative Instruments, Gain (Loss) [Table Text Block]	The following table provides the impact of derivative instruments designated as cash flow hedges on our consolidated income statement: Twenty-six Week Period Ended June 25, 2017 Amount of Gain or (Loss) Recognized in AOCI on Derivatives (Effective Portion) Amount of Pre-tax Gain or (Loss) Reclassified from AOCI into Income (Effective Portion) Amount of Pre-tax Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) (Dollars in thousands) Foreign currency forward contracts and collars $ 27,627 $ (3,582 ) $ (1,451 ) Total $ 27,627 $ (3,582 ) $ (1,451 )

Business Segments (Tables)

Business Segments (Tables)	6 Months Ended
	Jun. 25, 2017
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	Net Sales and Results of Operations by Reportable Segment Thirteen Weeks Ended Twenty-six Weeks Ended June 25, June 26, June 25, June 26, (Dollars in thousands) Net sales: North America $ 186,898 $ 182,709 $ 361,118 $ 368,774 Europe 53,730 — 53,730 — Consolidated net sales $ 240,628 $ 182,709 $ 414,848 $ 368,774 (Loss) Income from operations: North America $ (1,098 ) $ 19,540 $ 2,846 $ 38,262 Europe (900 ) — (900 ) — Consolidated (loss) income from operations $ (1,998 ) $ 19,540 $ 1,946 $ 38,262 Total Property, Plant and Equipment by Reportable Segment Total property, plant and equipment, net, by reportable segment as follows: June 25, December 31, (Dollars in thousands) Property, plant and equipment, net: North America $ 247,930 $ 227,403 Europe 253,677 — Total assets $ 501,607 $ 227,403

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 25, 2017
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories June 25, 2017 December 31, 2016 (Dollars in thousands) Raw materials $ 62,168 $ 40,255 Work in process 47,724 21,447 Finished goods 62,731 21,135 Inventories $ 172,623 $ 82,837

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 25, 2017
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, Plant and Equipment June 25, 2017 December 31, 2016 (Dollars in thousands) Land and buildings $ 134,030 $ 67,915 Machinery and equipment 681,324 485,185 Leasehold improvements and others 10,539 4,868 Construction in progress 46,534 26,301 872,427 584,269 Accumulated depreciation (370,820 ) (356,866 ) Property, plant and equipment, net $ 501,607 $ 227,403

Pre-Production Costs Related to

Pre-Production Costs Related to Long-Term Supply Arrangements (Tables)	6 Months Ended
	Jun. 25, 2017
Pre-Production Costs and Deferred Revenue Related to Long-Term Supply Arrangements [Abstract]
Pre-Production Costs and Deferred Revenue Related to Long-Term Supply Arrangements [Table Text Block]	e following tables summarize the unamortized customer-owned tooling costs included in our non-current assets, and the deferred tooling revenues included in accrued expenses and other non-current liabilities: June 25, 2017 December 31, 2016 (Dollars in thousands) Customer-Owned Tooling Costs Preproduction costs $ 81,912 $ 78,299 Accumulated amortization (68,216 ) (65,100 ) Net preproduction costs $ 13,696 $ 13,199 Deferred Tooling Revenues Accrued expenses $ 3,316 $ 5,419 Other non-current liabilities 5,341 2,593 Total deferred tooling revenues $ 8,657 $ 8,012

Goodwill and Other Intangible38

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 25, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	Following is a summary of the company’s finite-lived and indefinite-lived intangible assets as of June 25, 2017. There were no such intangible assets at December 31, 2016. Gross Carrying Amount Accumulated Amortization Currency Translation Net Remaining Weighted Average Amortization Period (Dollars in thousands Brand name $ 9,000 $ (150 ) $ 132 $ 8,982 5-6 Technology 16,000 (222 ) 235 16,013 4-6 Customer relationships 167,000 (1,799 ) 2,465 167,666 6-11 Total finite 192,000 (2,171 ) 2,832 192,661 Trade names 20,000 — 300 20,300 Indefinite Total $ 212,000 $ (2,171 ) $ 3,132 $ 212,961

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 25, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	(Dollars and shares in thousands, except per share amounts) Thirteen Weeks Ended Twenty-six Weeks Ended June 25, June 26, June 25, June 26, Basic Income Per Share: Reported net (loss) income $ (7,272 ) $ 13,165 $ (4,170 ) $ 27,628 Less: Redeemable preferred stock dividends (2,882 ) — (2,882 ) — Basic numerator $ (10,154 ) $ 13,165 $ (7,052 ) $ 27,628 Basic (loss) income per share $ (0.41 ) $ 0.52 $ (0.28 ) $ 1.08 Weighted average shares outstanding-Basic 24,908 25,430 24,961 25,512 Diluted Income Per Share: Reported net (loss) income $ (7,272 ) $ 13,165 $ (4,170 ) $ 27,628 Less: Redeemable preferred stock dividends (2,882 ) — (2,882 ) — Basic numerator $ (10,154 ) $ 13,165 $ (7,052 ) $ 27,628 Diluted (loss) income per share $ (0.41 ) $ 0.52 $ (0.28 ) $ 1.08 Weighted average shares outstanding-Basic 24,908 25,430 24,961 25,512 Weighted average dilutive stock options and restricted stock units — 113 — 75 Weighted average shares outstanding-Diluted 24,908 25,543 24,961 25,587

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Jun. 25, 2017
Compensation and Retirement Disclosure [Abstract]
Schedule of Net Benefit Costs	The following table summarizes the components of net periodic pension cost for the first half of 2017 and 2016 . Thirteen Weeks Ended Twenty-six Weeks Ended June 25, 2017 June 26, 2016 June 25, 2017 June 26, 2016 (Dollars in thousands) Service cost $ — $ — $ — $ — Interest cost 298 304 596 608 Net amortization 67 84 134 168 Net periodic pension cost $ 365 $ 388 $ 730 $ 776

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 25, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	A summary of long-term debt and the related weighted average interest rates is shown below (in thousands): June 25, 2017 Debt Instrument Long-Term Debt Debt Issuance Costs (1) Long-Term Debt, Net Weighted Average Interest Rate Term loan facility $ 388,800 $ (13,465 ) $ 375,335 4.8% 6.00% Senior Notes due 2025 279,051 (8,117 ) 270,934 6.0% Other 97,080 (3,493 ) 93,587 2.1% $ 764,931 $ (25,075 ) 739,856 Less: Current portion (18,800 ) Long-term debt $ 721,056 (1) Unamortized portion

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 25, 2017
Share-based Compensation [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	Stock-based compensation expense related to our equity incentive plans in accordance with U.S. GAAP was allocated as follows: Thirteen Weeks Ended Twenty-six Weeks Ended June 25, June 26, June 25, June 26, (Dollars in thousands) Cost of sales $ (138 ) $ 282 $ 49 $ 358 Selling, general and administrative expenses (154 ) 1,476 938 1,956 Stock-based compensation expense before income taxes (292 ) 1,758 987 2,314 Income tax benefit 108 (515 ) (364 ) (648 ) Total stock-based compensation expense after income taxes $ (184 ) $ 1,243 $ 623 $ 1,666

Nature of Operations (Details)

Nature of Operations (Details) - Sales Revenue, Goods, Net [Member] - Customer Concentration Risk [Member]	6 Months Ended
	Jun. 25, 2017
Concentration Risk [Line Items]
Percentage of total revenue	7.00%
Ford, GM, Toyota, Chrysler Companies [Member]
Concentration Risk [Line Items]
Percentage of total revenue	69.00%
Chrysler [Member]
Concentration Risk [Line Items]
Percentage of total revenue	5.00%
Ford, GM, Toyota, Fiat Chrysler Companies [Member] [Member]
Concentration Risk [Line Items]
Percentage of total revenue	81.00%

Acquisition (Details)

Acquisition (Details) $ / shares in Units, $ in Thousands	Jul. 31, 2017shares	May 30, 2017USD ($)$ / PLN	Jun. 25, 2017USD ($)$ / shares	Dec. 31, 2017USD ($)	Apr. 12, 2017	Mar. 23, 2017PLN / shares
Business Acquisition [Line Items]
Percentage of voting interest acquired		92.30%
Exchange rate | $ / PLN		3.74193
Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Tender offer percentage						100.00%
Acquiree commitment percentage						61.00%
Minimum purchase percentage					75.00%
Cash consideration		$ 703,000	$ 703,000
Share price (in polish zloty per share) | $ / shares			$ 247.87
Ownership percentage by noncontrolling owners		7.70%
Uniwheels Acquisition [Member] | Minimum [Member]
Business Acquisition [Line Items]
Step acquisition, remaining term to acquire		8 months
Uniwheels Acquisition [Member] | Maximum [Member]
Business Acquisition [Line Items]
Step acquisition, remaining term to acquire		10 months
Scenario, Forecast [Member] | Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Cash consideration				$ 778,000
Payments to acquire business including impact of hedge				$ 766,200
Significant Holder [Member] | Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Share price (in polish zloty per share) | PLN / shares						PLN 226.5
Uniwheels' Other Shareholders [Member] | Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Share price (in polish zloty per share) | PLN / shares						PLN 247.87
Share price additional percent						5.00%
Subsequent Event [Member] | Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Remaining shares tendered | shares	109,959

Acquisition (Schedule of Assets

Acquisition (Schedule of Assets and Liabilities Acquired) (Details) - USD ($) $ in Thousands	May 30, 2017	Jun. 25, 2017	Dec. 25, 2016
Business Acquisition [Line Items]
Goodwill		$ 310,728	$ 0
Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Cash consideration	$ 703,000	703,000
Non-controlling interest		63,200
Cash and cash equivalents		12,296
Accounts receivable		60,580
Inventories		82,402
Prepaid expenses and other current assets		11,479
Total current assets		166,757
Property and equipment		250,000
Intangible assets		212,000
Goodwill		306,154
Other assets		20,937
Total assets acquired		955,848
Accounts payable		61,883
Other current liabilities		40,361
Total current liabilities		102,244
Other long-term liabilities		87,404
Total liabilities assumed		189,648
Net assets acquired		$ 766,200

Acquisition (Schedule of Intang

Acquisition (Schedule of Intangibles Acquired) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 25, 2017	Dec. 25, 2016
Business Acquisition [Line Items]
Goodwill	$ 310,728	$ 0
Brand name | Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible useful lives	5 years
Brand name | Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible useful lives	6 years
Technology | Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible useful lives	4 years
Technology | Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible useful lives	6 years
Customer relationships | Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible useful lives	6 years
Customer relationships | Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible useful lives	11 years
Uniwheels Acquisition [Member]
Business Acquisition [Line Items]
Goodwill	$ 306,154
Intangible assets	212,000
Uniwheels Acquisition [Member] | Brand name
Business Acquisition [Line Items]
Finite-lived intangibles acquired	9,000
Uniwheels Acquisition [Member] | Technology
Business Acquisition [Line Items]
Finite-lived intangibles acquired	16,000
Uniwheels Acquisition [Member] | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired	167,000
Uniwheels Acquisition [Member] | Brand name
Business Acquisition [Line Items]
Indefinite-lived intangibles acquired	$ 20,000

Acquisition Acquisition (ProFor

Acquisition Acquisition (ProForma) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales as reported	$ 240,628	$ 182,709	$ 414,848	$ 368,774
Proforma combined sales	344,379	311,364	658,592	617,720
Net income	(7,519)		(4,417)	27,628
Net (loss) income attributable to Superior	(7,272)	13,165	(4,170)	27,628
Proforma net income	3,074	14,081	11,948	25,740
Uniwheels sales, prior to the Acquisition
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales as reported	103,751	128,655	243,744	248,946
Uniwheels net income before income taxes, prior to the Acquisition
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	8,465	16,445	25,394	28,197
Incremental interest expense on the debt
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	(7,081)	(10,622)	(17,776)	(21,332)
Incremental amortization on the identifiable intangible assets
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	(4,388)	(6,582)	(10,970)	(13,164)
Transaction expenses incurred by both the company and Uniwheels
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	12,722	0	19,684	0
Income tax expense related to the proforma adjustments
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	$ 875	$ 1,675	$ 33	$ 4,411

Restructuring (Details)

Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	12 Months Ended	36 Months Ended
	Jun. 25, 2017	Dec. 25, 2016	Jun. 26, 2016	Jun. 25, 2017	Dec. 25, 2016	Dec. 25, 2016	Dec. 31, 2016
Rogers, Arkansas facility closure [Member] | Cost of Sales, Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected Restructuring Charges	$ 16,029			$ 16,029
Restructuring and Related Cost, Incurred Cost	100		$ 200			$ 15,899
Accelerated Depreciation [Member] | Rogers, Arkansas facility closure [Member] | Cost of Sales, Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Accelerated Depreciation				13		7,254
Expected Restructuring Charges	7,267			7,267
One-time Termination Benefits [Member] | Rogers, Arkansas facility closure [Member] | Cost of Sales, Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected Restructuring Charges	2,011			2,011
Restructuring and Related Cost, Incurred Cost				0		2,011
Other Restructuring [Member] | Rogers, Arkansas facility closure [Member] | Cost of Sales, Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected Restructuring Charges	6,751			6,751
Restructuring and Related Cost, Incurred Cost				117		$ 6,634
Restructuring Costs, All Costs [Member] | Rogers, Arkansas facility closure [Member]
Restructuring Cost and Reserve [Line Items]
Expected Restructuring Charges	$ 14,593			14,593			$ 14,463
Restructuring and Related Cost, Incurred Cost				130
Building [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from Sale of Buildings		$ 4,300
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property				$ (1,436)	$ (1,436)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 25, 2016
Assets
Cash surrender value	$ 7,666	$ 7,480
Derivative contracts	10,259	13
Total	18,675	8,243
Liabilities
Derivative contracts	6,629	24,773
Total	6,629	24,773
Certificates of deposit
Assets
Certificates of deposit	750	750
(Level 1)
Assets
Derivative contracts	0	0
Total	0	0
Liabilities
Derivative contracts	0	0
Total	0	0
(Level 1) | Certificates of deposit
Assets
Certificates of deposit	0	0
(Level 1) | Cash surrender value
Assets
Cash surrender value	0	0
(Level 2)
Assets
Derivative contracts	10,259	13
Total	18,675	8,243
Liabilities
Derivative contracts	6,629	24,773
Total	6,629	24,773
(Level 2) | Certificates of deposit
Assets
Certificates of deposit	750	750
(Level 2) | Cash surrender value
Assets
Cash surrender value	7,666	7,480
(Level 3)
Assets
Derivative contracts	0	0
Total	0	0
Liabilities
Derivative contracts	0	0
Total	0	0
(Level 3) | Certificates of deposit
Assets
Certificates of deposit	0	0
(Level 3) | Cash surrender value
Assets
Cash surrender value	$ 0	$ 0

Financial Instruments (Details)

Financial Instruments (Details) - USD ($)	6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Dec. 25, 2016
Derivatives, Fair Value [Line Items]
Maximum length of time, foreign currency cash flow hedge	42 months
Gain (loss) on foreign currency derivative instruments not desinated as hedging instruments	$ (1,500,000)	$ (100,000)
Derivative Liability, Notional Amount			$ (160,461,000)
Derivative, Notional Amount	195,377,000
Derivative, Fair Value, Net	3,629,000		(24,760,000)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(27,627,000)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(3,582,000)
Gain (Loss) on Derivative Instruments, Net, Pretax	(1,451,000)
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	5,134,000
Other Non-current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	5,125,000
Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	3,848,000
Other Non-current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	2,782,000
Designated as Hedging Instrument [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset			13,000
Designated as Hedging Instrument [Member] | Other Non-current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset			0
Designated as Hedging Instrument [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability			10,076,000
Designated as Hedging Instrument [Member] | Other Non-current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability			14,697,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net			0
Not Designated as Hedging Instrument [Member] | Other Non-current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Not Designated as Hedging Instrument [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0
Not Designated as Hedging Instrument [Member] | Other Non-current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	459,000
Foreign exchange forward contracts and collars designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(27,627,000)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(3,582,000)
Gain (Loss) on Derivative Instruments, Net, Pretax	(1,451,000)
Foreign exchange forward contracts and collars designated as hedging instruments | Designated as Hedging Instrument [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,596,000		13,000
Foreign exchange forward contracts and collars designated as hedging instruments | Designated as Hedging Instrument [Member] | Other Non-current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	5,125,000		0
Foreign exchange forward contracts and collars designated as hedging instruments | Designated as Hedging Instrument [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	3,032,000		10,076,000
Foreign exchange forward contracts and collars designated as hedging instruments | Designated as Hedging Instrument [Member] | Other Non-current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	1,938,000		14,697,000
Foreign Exchange Option [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount			(160,461,000)
Derivative Asset, Notional Amount	248,430,700
Derivative, Fair Value, Net	4,751,000		(24,760,000)
Aluminum forward contracts not designated as hedges | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(6,558,484)
Derivative, Fair Value, Net	(737,000)		0
Aluminum forward contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	79,000
Aluminum forward contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Other Non-current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Aluminum forward contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	816,000
Aluminum forward contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Other Non-current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0
Interest rate swap contracts not designated as hedges | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(46,496,070)
Derivative, Fair Value, Net	(385,000)		$ 0
Interest rate swap contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Interest rate swap contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Other Non-current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Interest rate swap contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0
Interest rate swap contracts not designated as hedges | Not Designated as Hedging Instrument [Member] | Other Non-current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	385,000
Cross currency swap not designated as hedging instrument | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0
Cross currency swap not designated as hedging instrument | Not Designated as Hedging Instrument [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 459,000
Minimum [Member]
Derivatives, Fair Value [Line Items]
Derivative, Remaining Maturity	1 month
Maximum [Member]
Derivatives, Fair Value [Line Items]
Derivative, Remaining Maturity	42 months
Estimate of Fair Value Measurement [Member]
Derivatives, Fair Value [Line Items]
Long-term debt fair value	$ 762,020,000
Reported Value Measurement [Member]
Derivatives, Fair Value [Line Items]
Long-term debt fair value	$ 764,931,000

Business Segments (Details)

Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016	Dec. 25, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales as reported	$ 240,628	$ 182,709	$ 414,848	$ 368,774
(Loss) Income from operations	(1,998)	19,540	1,946	38,262
Property, plant and equipment, net	501,607		501,607		$ 227,403
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales as reported	186,898	182,709	361,118	368,774
(Loss) Income from operations	(1,098)	19,540	2,846	38,262
Property, plant and equipment, net	247,930		247,930		227,403
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales as reported	53,730	0	53,730	0
(Loss) Income from operations	(900)	$ 0	(900)	$ 0
Property, plant and equipment, net	$ 253,677		$ 253,677		$ 0

Short-Term Investments (Details

Short-Term Investments (Details) - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 25, 2016
Short-term Investments [Abstract]
Short-term investments	$ 750	$ 750

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 25, 2016
Inventory [Line Items]
Raw materials	$ 62,168	$ 40,255
Work in process	47,724	21,447
Finished goods	62,731	21,135
Inventories	172,623	82,837
Inventory, noncurrent	7,700	6,500
Supplies inventory	14,300	$ 10,300
Europe
Inventory [Line Items]
Inventories	$ 81,700

Property, Plant and Equipment54

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Dec. 25, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 872,427		$ 584,269
Accumulated depreciation	(370,820)		(356,866)
Property, plant and equipment, net	501,607		227,403
Depreciation expense	19,500	$ 17,300
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	134,030		67,915
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	681,324		485,185
Leasehold improvements and others
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,539		4,868
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46,534		$ 26,301
Europe
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 253,700

Pre-Production Costs Related 55

Pre-Production Costs Related to Long-Term Supply Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Dec. 25, 2016
Unamortized Preproduction Costs [Abstract]
Preproduction costs	$ 81,912		$ 78,299
Accumulated amortization	(68,216)		(65,100)
Net preproduction costs	13,696		13,199
Deferred Revenue [Abstract]
Accrued expenses	3,316		5,419
Other non-current liabilities	5,341		2,593
Total deferred tooling revenues	8,657		$ 8,012
Deferred Revenue, Revenue Recognized	$ 3,500	$ 3,900

Goodwill and Other Intangible56

Goodwill and Other Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Dec. 25, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0
Indefinite-lived intangible asset impairment	0
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	192,000,000		$ 192,000,000
Accumulated Amortization	(2,171,000)		(2,171,000)
Currency Translation	2,832,000		2,832,000
Net	192,661,000		192,661,000
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Gross Carrying Amount	20,000,000		20,000,000
Currency Translation	300,000		300,000
Net	20,300,000		20,300,000
Intangible Assets, Gross (Excluding Goodwill)	212,000,000		212,000,000
Intangible Assets (Excluding Goodwill), Accumulated Foreign Currency Gain (Loss)	3,132,000		3,132,000
Intangibles, net	212,961,000		212,961,000	$ 0
Amortization of intangible assets	2,200,000	$ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,018	26,300,000		26,300,000
2,019	26,300,000		26,300,000
2,020	26,300,000		26,300,000
2,021	26,300,000		26,300,000
2,022	24,400,000		24,400,000
Brand name
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	9,000,000		9,000,000
Accumulated Amortization	(150,000)		(150,000)
Currency Translation	132,000		132,000
Net	8,982,000		$ 8,982,000
Brand name | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
Brand name | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years
Technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	16,000,000		$ 16,000,000
Accumulated Amortization	(222,000)		(222,000)
Currency Translation	235,000		235,000
Net	16,013,000		$ 16,013,000
Technology | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			4 years
Technology | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	167,000,000		$ 167,000,000
Accumulated Amortization	(1,799,000)		(1,799,000)
Currency Translation	2,465,000		2,465,000
Net	$ 167,666,000		$ 167,666,000
Customer relationships | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years
Customer relationships | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			11 years

Redeemable Preferred Shares (De

Redeemable Preferred Shares (Details)	May 22, 2017USD ($)director$ / sharesshares	Jun. 25, 2017USD ($)shares	Jun. 26, 2016USD ($)	May 21, 2017director	Dec. 25, 2016USD ($)
Temporary Equity [Line Items]
Proceeds from issuance of redeemable preferred shares		$ 150,000,000	$ 0
Temporary Equity, Par Value		0.01			$ 0.01
Number of Directors | director	9			8
Convertible Preferred Stock, Redemption, Period One [Member]
Temporary Equity [Line Items]
Convertible Preferred Stock, Redemption Value		$ 262,500,000
Convertible Preferred Stock, Redemption Value Percent of Stated Value		175.00%
Convertible Preferred Stock, Redemption, Period Two [Member]
Temporary Equity [Line Items]
Convertible Preferred Stock, Redemption Value		$ 300,000,000
Convertible Preferred Stock, Redemption Value Percent of Stated Value		200.00%
Convertible Preferred Stock, Total Shares Issued upon Conversion | shares		5,300,000
Series A Preferred Stock [Member]
Temporary Equity [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion | shares	28.162
Temporary Equity, Stock Issued During Period, Shares, New Issues | shares	140,202
Temporary Equity, Liquidation Preference Per Share | $ / shares	$ 1,000
Temporary Equity, Par Value	$ 0.01
Preferred Stock, Dividend Rate, Percentage	9.00%
Convertible Preferred Stock, Threshold Stock Price Trigger | $ / shares	$ 84
Series B Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary Equity, Stock Issued During Period, Shares, New Issues | shares	9,798
Temporary Equity, Liquidation Preference Per Share | $ / shares	$ 1,000
Temporary Equity, Par Value	$ 0.01
Preferred Stock, Dividend Rate, Percentage	9.00%
Series B Preferred Stock [Member] | Approval After Sept 9, 2017 [Member]
Temporary Equity [Line Items]
Preferred Stock, Dividend Rate, Percentage	11.00%

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Basic Income Per Share:
Reported net (loss) income	$ (7,272)	$ 13,165	$ (4,170)	$ 27,628
Less: Redeemable preferred stock dividends	(2,882)	0	(2,882)	0
Basic numerator	$ (10,154)	$ 13,165	$ (7,052)	$ 27,628
Basic (loss) income per share	$ (0.41)	$ 0.52	$ (0.28)	$ 1.08
Weighted average shares outstanding-Basic	24,908	25,430	24,961	25,512
Diluted Income Per Share:
Reported net (loss) income	$ (7,519)		$ (4,417)	$ 27,628
Less: Redeemable preferred stock dividends	(2,882)	$ 0	(2,882)	0
Basic numerator	$ (10,154)	$ 13,165	$ (7,052)	$ 27,628
Diluted (loss) income per share	$ (0.41)	$ 0.52	$ (0.28)	$ 1.08
Weighted average dilutive stock options and restricted stock units	0	113	0	75
Weighted average shares outstanding-Diluted	24,908	25,543	24,961	25,587

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Income Tax Disclosure [Abstract]
Income tax (provision) benefit	$ 1,722	$ (6,082)	$ 1,524	$ (10,640)
Pre-tax loss	$ (9,241)	$ 19,247	$ (5,941)	$ 38,268
Effective income tax rate			25.60%	28.00%

Retirement Plans (Details)

Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016	Dec. 25, 2016
Compensation and Retirement Disclosure [Abstract]
Cash surrender value	$ 7,700		$ 7,700		$ 7,500
Age for benefits			65
Payments to retirees			$ 700
Anticipated benefit payments			1,500
Service cost	0	$ 0	0	$ 0
Interest cost	298	304	596	608
Net amortization	67	84	134	168
Net periodic pension cost	$ 365	$ 388	$ 730	$ 776

Debt (Summary of Long Term Debt

Debt (Summary of Long Term Debt) (Details) - USD ($) $ in Thousands	Jun. 25, 2017	May 30, 2017	Dec. 25, 2016
Debt Instrument [Line Items]
Long-Term Debt	$ 764,931
Debt Issuance Costs	(25,075)
Long-Term Debt, Net	739,856	$ 70,700
Less: Current portion	(18,800)		$ 0
Long-term debt	721,056		$ 0
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-Term Debt	388,800
Debt Issuance Costs	(13,465)
Long-Term Debt, Net	$ 375,335
Weighted Average Interest Rate	4.80%
Senior Notes [Member] | Senior Notes, 6.00%, Due 2025 [Member]
Debt Instrument [Line Items]
Long-Term Debt	$ 279,051
Debt Issuance Costs	(8,117)
Long-Term Debt, Net	$ 270,934
Weighted Average Interest Rate	6.00%
Other [Member]
Debt Instrument [Line Items]
Long-Term Debt	$ 97,080
Debt Issuance Costs	(3,493)
Long-Term Debt, Net	$ 93,587
Weighted Average Interest Rate	2.10%

Debt (Details)

Debt (Details)	Sep. 30, 2017	Jun. 25, 2017USD ($)	Jun. 15, 2017EUR (€)	Mar. 22, 2017USD ($)	Jun. 25, 2017USD ($)	May 30, 2017USD ($)	Dec. 25, 2016USD ($)
Debt Instrument [Line Items]
Long-term Debt		$ 739,856,000			$ 739,856,000	$ 70,700,000
Current portion of long-term debt		18,800,000			18,800,000		$ 0
Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Long-term Debt		69,500,000			69,500,000
Current portion of long-term debt		18,800,000			18,800,000
Term Loan Facility [Member] | Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Long-term Debt		39,300,000			39,300,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Commitment fees percentage				0.50%
Revolving Credit Facility [Member] | Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Long-term Debt		9,800,000			9,800,000
Revolving Credit Facility [Member] | Scenario, Forecast [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commitment fees percentage	0.50%
Revolving Credit Facility [Member] | Scenario, Forecast [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commitment fees percentage	0.25%
Equipment Loan [Member] | Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Long-term Debt		20,400,000			$ 20,400,000
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				1.00%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				3.50%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage	3.50%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage	3.00%
Base Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				2.00%
Base Rate [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage	2.50%
Base Rate [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage	2.00%
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				0.50%
One Month London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				1.00%
One Month London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				3.50%
Euribor [Member] | Term Loan Facility [Member] | Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Interest rate spread percentage					1.00%
Euribor [Member] | Revolving Credit Facility [Member] | Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Interest rate spread percentage					1.00%
Euribor [Member] | Equipment Loan [Member] | Uniwheels Acquisition [Member]
Debt Instrument [Line Items]
Interest rate spread percentage					1.00%
Senior Notes, 6.00%, Due 2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €			€ 250,000,000
Interest rate percentage			6.00%
Long-term Debt		270,934,000			$ 270,934,000
Senior Notes, 6.00%, Due 2025 [Member] | Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Redemption percentage			101.50%		40.00%
Senior Notes, 6.00%, Due 2025 [Member] | Senior Notes [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Redemption percentage			100.00%
Senior Notes, 6.00%, Due 2025 [Member] | Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Redemption percentage			103.00%		100.00%
Senior Secured Term Loan Facility [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Percentage of capital stock issued				65.00%
Senior Secured Term Loan Facility [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Amount of term loan facility				$ 400,000,000
Repayments under term loan facility		11,200,000
Term loan facility balance		388,800,000			$ 388,800,000
Balance		27,600,000			27,600,000
Amount outstanding		2,800,000			2,800,000
Amount of availability		$ 129,600,000			$ 129,600,000
Senior Secured Term Loan Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount of term loan facility				$ 160,000,000
Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				1.00%
Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				4.50%
Senior Secured Term Loan Facility [Member] | Base Rate [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				2.00%
Senior Secured Term Loan Facility [Member] | Federal Funds Effective Swap Rate [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				0.50%
Senior Secured Term Loan Facility [Member] | One Month London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				1.00%
Senior Secured Term Loan Facility [Member] | One Month LIBOR Plus Margin [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate spread percentage				3.50%

Commitments and Contingencies (

Commitments and Contingencies (Details)	6 Months Ended
	Jun. 25, 2017
Commitments and Contingencies Disclosure [Abstract]
Maximum length of time, foreign currency cash flow hedge	42 months

Stock-Based Compensation Stock

Stock-Based Compensation Stock Option Activity (Details)	Dec. 31, 2016USD ($)$ / sharesshares	Jun. 25, 2017USD ($)$ / sharesshares	Jun. 25, 2017USD ($)category$ / sharesshares	Dec. 25, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorizes issuance of common stock (in shares)		3,500,000	3,500,000
Number of shares available for grant		1,700,000	1,700,000
Maximum shares that may be used as full value awards			600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)			0
Exercised (in shares)			0
Canceled (in shares)			(3,000)
Expired (in shares)			0
Balance at June 25, 2017 (in shares)	231,625	228,625	228,625
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Granted (in dollars per share) | $ / shares			$ 0
Exercised (in dollars per share) | $ / shares			0
Canceled (in dollars per share) | $ / shares			19.62
Expired (in dollars per share) | $ / shares			0
Balance at June 25, 2017 (in dollars per share) | $ / shares	$ 18.88	$ 18.87	$ 18.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options vested or expected to vest, Oustanding (in shares)		228,625	228,625
Options vested or expected to vest, Weighted Average Exercise Price (in dollars per share) | $ / shares		$ 18.87	$ 18.87
Options vested or expected to vest, Remaining Contractual Life in Years			2 years 7 months 6 days	3 years 1 month 6 days
Options vested or expected to vest, Aggregate Intrinsic Value | $	$ 1,845,263	$ 375,530	$ 375,530
Exercisable, Outstanding (in shares)		228,625	228,625
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares		$ 18.87	$ 18.87
Exercisable, Remaining Contractual Life in Years			2 years 7 months 6 days
Exercisable, Aggregate Intrinsic Value | $		$ 375,530	$ 375,530
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)		0
Vested (in shares)		(132,455)
Canceled (in shares)		(417)
Balance (in shares)	144,295	11,423	11,423
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share) | $ / shares		$ 0
Vested (in dollars per share) | $ / shares		19.44
Canceled (in dollars per share) | $ / shares		19.16
Balance (in dollars per share) | $ / shares	$ 19.43	$ 19.30	$ 19.30
Weighted Average Remaining Amortization Period (in Years)	6 months	2 months 6 days
Amount of unrecognized compensation cost | $		$ 5,800,000	$ 5,800,000
Weighted average period for recognition			1 year 10 months 24 days
Capitalized share based compensation cost | $		$ 0	$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards exchangeable to a share of common stock			0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)		80,288
Vested (in shares)		(37,660)
Canceled (in shares)		(10,571)
Balance (in shares)	127,567	159,624	159,624
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share) | $ / shares		$ 24.12
Vested (in dollars per share) | $ / shares		23.69
Canceled (in dollars per share) | $ / shares		22.90
Balance (in dollars per share) | $ / shares	$ 22.03	$ 22.64	$ 22.64
Weighted Average Remaining Amortization Period (in Years)	1 year 8 months 12 days	1 year 10 months 13 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of individual categories | category			3
Vesting percentage		40
Vesting percentage		2000.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)			227,193
Granted (in shares)			118,157
Vested (in shares)			0
Canceled (in shares)			(29,921)
Balance (in shares)		315,429	315,429	227,193
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance (in dollars per share) | $ / shares			$ 21.72
Granted (in dollars per share) | $ / shares			23.90
Vested (in dollars per share) | $ / shares			0
Canceled (in dollars per share) | $ / shares			22.45
Balance (in dollars per share) | $ / shares		$ 22.47	$ 22.47	$ 21.72
Weighted Average Remaining Amortization Period (in Years)	1 year 7 months 6 days		1 year 11 months 13 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years

Stock-Based Compensation Stock-

Stock-Based Compensation Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ (292)	$ 1,758	$ 987	$ 2,314
Income tax benefit	108	(515)	(364)	(648)
Total stock-based compensation expense after income taxes	(184)	1,243	623	1,666
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	(138)	282	49	358
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ (154)	$ 1,476	$ 938	$ 1,956

Common Stock Repurchase Progr66

Common Stock Repurchase Programs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016	Dec. 27, 2015	Oct. 14, 2014
Equity, Class of Treasury Stock [Line Items]
Cost of share repurchases		$ 5,014	$ 13,098
2014 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Amount authorized to be repurchased					$ 30,000
Cost of share repurchases	$ 10,300			$ 19,600
Shares repurchased	585,970			1,056,954
2016 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Amount authorized to be repurchased		50,000
Cost of share repurchases		$ 5,000	$ 2,800
Shares repurchased	137,699	215,841

Uncategorized Items - sup-20170

Label	Element	Value
Retained Earnings [Member]
Net Income (Loss) Attributable to Parent	us-gaap_NetIncomeLoss	$ 27,628,000