Basis of Presentation and Consolidation	6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. There is a year-round demand for the Company’s tires, but sales of light vehicle replacement tires are generally strongest during the third and fourth quarters of the year. Winter tires are sold principally during the months of June through November. Operating results for the six month period ended June 30, 2017 are not necessarily indicative of the results that may be expected for the year ended December 31, 2017. The Company consolidates into its financial statements the accounts of the Company, all wholly-owned subsidiaries, and any partially-owned subsidiary that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50 percent owned are consolidated, investments in affiliates of 50 percent or less but greater than 20 percent are accounted for using the equity method, and investments in affiliates of 20 percent or less are accounted for using the cost method. The Company does not consolidate any entity for which it has a variable interest based solely on power to direct the activities and significant participation in the entity’s expected results that would not otherwise be consolidated based on control through voting interests. Further, the Company’s joint ventures are businesses established and maintained in connection with the Company’s operating strategy. All intercompany transactions and balances have been eliminated. Truck and Bus Tire Tariffs Antidumping and countervailing duty investigations into certain truck and bus tires imported from the People's Republic of China ("PRC") into the United States were initiated on January 29, 2016. The preliminary determinations announced in both investigations were affirmative and resulted in the imposition of significant additional duties from each. The Company incurred expense of $22,042 over the final seven months of the year-ended December 31, 2016 related to these additional duties. On February 22, 2017, the United States ("U.S.") International Trade Commission determined the U.S. market had not suffered material injury because of imports of truck and bus tires from China. As a result of this decision, preliminary antidumping and countervailing duties from Chinese truck and bus tires imported subsequent to the preliminary determination are not to be collected and any amounts previously paid will be refunded by U.S. Customs and Border Protection. Further, prospective imports of truck and bus tires from the PRC are not subject to these additional duties. In the first quarter of 2017, the Company reversed the previously expensed preliminary duties of $22,042 due to the decision by the U.S. International Trade Commission. This amount was recorded as a reduction of cost of products sold in the Condensed Consolidated Statement of Income for the six month period ended June 30, 2017. North American Distribution Center On January 22, 2017, a tornado hit the Company’s leased Albany, Georgia distribution center, causing damage to the Company's assets and disrupting certain operations. Insurance, less applicable deductibles, covers the repair or replacement of the Company's assets that suffered loss or damage, and the Company is working closely with its insurance carriers and claims adjusters to ascertain the full amount of insurance proceeds due to the Company as a result of the damages and the loss the Company suffered. The Company's insurance policies also provide coverage for interruption to its business, including lost profits, and reimbursement for other expenses and costs that have been incurred relating to the damages and losses suffered. In the second quarter of 2017, the Company recorded insurance recoveries of $5,500 for direct costs caused by the tornado through the first six months of 2017, while incurring direct costs of $1,974 in the second quarter related to the disposal of damaged tires, freight to move product to other warehouses and professional fees to secure and maintain the site. Through the first half of 2017, the Company incurred direct expenses of $8,772 related to damages caused by the tornado, less proceeds of $5,500 recovered from insurance. These amounts were recorded as a component of cost of products sold in the Condensed Consolidated Statement of Income for the three and six month periods ended June 30, 2017. At this time, the full amount of combined property damage and business interruption costs and recoveries cannot be estimated, and accordingly, no additional amounts, including amounts for insurance recoveries, have been recorded as of June 30, 2017. Accounting Pronouncements Each change to U.S. GAAP is established by the Financial Accounting Standards Board (“FASB”) in the form of an accounting standards update (“ASU”) to the FASB’s Accounting Standards Codification (“ASC”). The Company considers the applicability and impact of all accounting standards updates. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements. Accounting Pronouncements – Recently Adopted Stock Compensation In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which simplifies several aspects of the accounting for employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding requirements, as well as classification in the Condensed Consolidated Statements of Cash Flows. Application of the standard is required for the annual and interim periods beginning after December 15, 2016. The Company adopted the standard in the first quarter of 2017. As a result of the adoption, on a prospective basis, we recognized $30 and $1,939 of excess tax benefits from stock-based compensation as discrete items in our provision for income taxes for the three and six months ended June 30, 2017, respectively. Additionally, the cash flow benefit of the excess tax benefits is included as an operating activity in the Condensed Consolidated Statement of Cash Flows for the period ended June 30, 2017. In accordance with the standard, the prior year Condensed Consolidated Statement of Income and Condensed Consolidated Statement of Cash Flows presentation of the Company's excess tax benefits have not been restated. The new standard also requires that employee taxes paid when an employer withholds shares for tax-withholding purposes be reported as financing activities in the Condensed Consolidated Statements of Cash Flows on a retrospective basis. Previously, this activity was included in operating activities. The impact of this change in the first half of 2017 and first half of 2016 was $6,429 and $2,086, respectively. Finally, as permitted by the standard, we will account for forfeitures of share-based payments when they occur. Accounting Pronouncements – To Be Adopted Revenue Recognition In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which will supersede most current revenue recognition guidance, including industry-specific guidance. The core principle is that an entity will recognize revenue to depict the transfer of goods or services to customers in an amount that the entity expects to be entitled to in exchange for those goods or services. The standard provides a five-step model to determine when and how revenue is recognized. Other major provisions of the standard include capitalization of certain contract costs, consideration of time value of money in the transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. The standard also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity’s contracts with customers. In July 2015, the FASB approved the deferral of the new standard's effective date by one year. The new standard is effective for annual reporting periods beginning after December 15, 2017. In 2016, the FASB issued several amendments to the standard, which provided clarification, additional guidance, practical expedients, technical corrections and other improvements to ASU 2014-09. The guidance permits two methods of adoption: the full retrospective method, in which case the standard would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective transition method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The Company has substantially completed its evaluation of significant contracts and the review of its current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to the Company’s revenue contracts. In addition, the Company has identified, and is in the process of implementing, appropriate changes to business processes, systems and controls to support recognition and disclosure under the new standard. While a final decision has not been made, the Company expects to adopt the new revenue standard in the first quarter of 2018, applying the modified retrospective transition method. The Company does not expect the adoption of the new revenue standard to have a material impact on the amount and timing of revenue recognized in the Company's condensed consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02, “Leases,” which requires balance sheet recognition of lease liabilities and right-of-use assets for most leases having terms of twelve months or longer. Application of the standard, which should be applied using a modified retrospective approach, is required for the annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements. Goodwill In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment," which simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. The standard requires goodwill impairment to be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of its goodwill. Application of the standard, which should be applied prospectively, is required for the annual and interim periods beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements. Pensions and Postretirement Benefits Other than Pensions In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which requires changes to the income statement presentation of net periodic benefit cost. The service cost component of net periodic benefit cost will continue to be classified in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net periodic benefit cost are required to be presented in the income statement separately from the service cost component and outside of operating profit. In addition, the new standard will allow only the service cost component to be eligible for capitalization, when applicable. Application of the standard, which should be applied retrospectively for the income statement presentation changes and prospectively for the capitalization changes, is required for the annual and interim periods beginning after December 15, 2017. Early adoption is permitted if adopted in the first interim period of the fiscal year. As reported in the Company's 2016 Form 10-K, 2016 and 2015 net periodic benefit costs were $64,842 and $58,384, respectively. The service cost component of these amounts in 2016 and 2015, which will remain as a component of operating profit, were $11,771 and $13,559, respectively. Net income will not change as a result of the adoption of this standard. The Company is currently evaluating the remaining impacts the new standard will have on its condensed consolidated financial statements.

Basis of Presentation and Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation.

There is a year-round demand for the Company’s tires, but sales of light vehicle replacement tires are generally strongest during the third and fourth quarters of the year. Winter tires are sold principally during the months of June through November. Operating results for the six month period ended June 30, 2017 are not necessarily indicative of the results that may be expected for the year ended December 31, 2017.

The Company consolidates into its financial statements the accounts of the Company, all wholly-owned subsidiaries, and any partially-owned subsidiary that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50 percent owned are consolidated, investments in affiliates of 50 percent or less but greater than 20 percent are accounted for using the equity method, and investments in affiliates of 20 percent or less are accounted for using the cost method. The Company does not consolidate any entity for which it has a variable interest based solely on power to direct the activities and significant participation in the entity’s expected results that would not otherwise be consolidated based on control through voting interests. Further, the Company’s joint ventures are businesses established and maintained in connection with the Company’s operating strategy. All intercompany transactions and balances have been eliminated.

Truck and Bus Tire Tariffs

Antidumping and countervailing duty investigations into certain truck and bus tires imported from the People's Republic of China ("PRC") into the United States were initiated on January 29, 2016. The preliminary determinations announced in both investigations were affirmative and resulted in the imposition of significant additional duties from each. The Company incurred expense of $22,042 over the final seven months of the year-ended December 31, 2016 related to these additional duties. On February 22, 2017, the United States ("U.S.") International Trade Commission determined the U.S. market had not suffered material injury because of imports of truck and bus tires from China. As a result of this decision, preliminary antidumping and countervailing duties from Chinese truck and bus tires imported subsequent to the preliminary determination are not to be collected and any amounts previously paid will be refunded by U.S. Customs and Border Protection. Further, prospective imports of truck and bus tires from the PRC are not subject to these additional duties. In the first quarter of 2017, the Company reversed the previously expensed preliminary duties of $22,042 due to the decision by the U.S. International Trade Commission. This amount was recorded as a reduction of cost of products sold in the Condensed Consolidated Statement of Income for the six month period ended June 30, 2017.

North American Distribution Center

On January 22, 2017, a tornado hit the Company’s leased Albany, Georgia distribution center, causing damage to the Company's assets and disrupting certain operations. Insurance, less applicable deductibles, covers the repair or replacement of the Company's assets that suffered loss or damage, and the Company is working closely with its insurance carriers and claims adjusters to ascertain the full amount of insurance proceeds due to the Company as a result of the damages and the loss the Company suffered. The Company's insurance policies also provide coverage for interruption to its business, including lost profits, and reimbursement for other expenses and costs that have been incurred relating to the damages and losses suffered. In the second quarter of 2017, the Company recorded insurance recoveries of $5,500 for direct costs caused by the tornado through the first six months of 2017, while incurring direct costs of $1,974 in the second quarter related to the disposal of damaged tires, freight to move product to other warehouses and professional fees to secure and maintain the site. Through the first half of 2017, the Company incurred direct expenses of $8,772 related to damages caused by the tornado, less proceeds of $5,500 recovered from insurance. These amounts were recorded as a component of cost of products sold in the Condensed Consolidated Statement of Income for the three and six month periods ended June 30, 2017. At this time, the full amount of combined property damage and business interruption costs and recoveries cannot be estimated, and accordingly, no additional amounts, including amounts for insurance recoveries, have been recorded as of June 30, 2017.

Accounting Pronouncements

Each change to U.S. GAAP is established by the Financial Accounting Standards Board (“FASB”) in the form of an accounting standards update (“ASU”) to the FASB’s Accounting Standards Codification (“ASC”).

The Company considers the applicability and impact of all accounting standards updates. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements.

Accounting Pronouncements – Recently Adopted

Stock Compensation

In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which simplifies several aspects of the accounting for employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding requirements, as well as classification in the Condensed Consolidated Statements of Cash Flows. Application of the standard is required for the annual and interim periods beginning after December 15, 2016. The Company adopted the standard in the first quarter of 2017. As a result of the adoption, on a prospective basis, we recognized $30 and $1,939 of excess tax benefits from stock-based compensation as discrete items in our provision for income taxes for the three and six months ended June 30, 2017, respectively. Additionally, the cash flow benefit of the excess tax benefits is included as an operating activity in the Condensed Consolidated Statement of Cash Flows for the period ended June 30, 2017. In accordance with the standard, the prior year Condensed Consolidated Statement of Income and Condensed Consolidated Statement of Cash Flows presentation of the Company's excess tax benefits have not been restated. The new standard also requires that employee taxes paid when an employer withholds shares for tax-withholding purposes be reported as financing activities in the Condensed Consolidated Statements of Cash Flows on a retrospective basis. Previously, this activity was included in operating activities. The impact of this change in the first half of 2017 and first half of 2016 was $6,429 and $2,086, respectively. Finally, as permitted by the standard, we will account for forfeitures of share-based payments when they occur.

Accounting Pronouncements – To Be Adopted

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which will supersede most current revenue recognition guidance, including industry-specific guidance. The core principle is that an entity will recognize revenue to depict the transfer of goods or services to customers in an amount that the entity expects to be entitled to in exchange for those goods or services. The standard provides a five-step model to determine when and how revenue is recognized. Other major provisions of the standard include capitalization of certain contract costs, consideration of time value of money in the transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. The standard also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity’s contracts with customers. In July 2015, the FASB approved the deferral of the new standard's effective date by one year. The new standard is effective for annual reporting periods beginning after December 15, 2017. In 2016, the FASB issued several amendments to the standard, which provided clarification, additional guidance, practical expedients, technical corrections and other improvements to ASU 2014-09.

The guidance permits two methods of adoption: the full retrospective method, in which case the standard would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective transition method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application.

The Company has substantially completed its evaluation of significant contracts and the review of its current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to the Company’s revenue contracts. In addition, the Company has identified, and is in the process of implementing, appropriate changes to business processes, systems and controls to support recognition and disclosure under the new standard.

While a final decision has not been made, the Company expects to adopt the new revenue standard in the first quarter of 2018, applying the modified retrospective transition method. The Company does not expect the adoption of the new revenue standard to have a material impact on the amount and timing of revenue recognized in the Company's condensed consolidated financial statements.

Leases

In February 2016, the FASB issued ASU 2016-02, “Leases,” which requires balance sheet recognition of lease liabilities and right-of-use assets for most leases having terms of twelve months or longer. Application of the standard, which should be applied using a modified retrospective approach, is required for the annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.

Goodwill

In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment," which simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. The standard requires goodwill impairment to be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of its goodwill. Application of the standard, which should be applied prospectively, is required for the annual and interim periods beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.

Pensions and Postretirement Benefits Other than Pensions

In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” which requires changes to the income statement presentation of net periodic benefit cost. The service cost component of net periodic benefit cost will continue to be classified in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net periodic benefit cost are required to be presented in the income statement separately from the service cost component and outside of operating profit. In addition, the new standard will allow only the service cost component to be eligible for capitalization, when applicable. Application of the standard, which should be applied retrospectively for the income statement presentation changes and prospectively for the capitalization changes, is required for the annual and interim periods beginning after December 15, 2017. Early adoption is permitted if adopted in the first interim period of the fiscal year. As reported in the Company's 2016 Form 10-K, 2016 and 2015 net periodic benefit costs were $64,842 and $58,384, respectively. The service cost component of these amounts in 2016 and 2015, which will remain as a component of operating profit, were $11,771 and $13,559, respectively. Net income will not change as a result of the adoption of this standard. The Company is currently evaluating the remaining impacts the new standard will have on its condensed consolidated financial statements.