Interim Financial Statements	6 Months Ended
Jun. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Statements	Interim Financial Statements Nature of Business NN, Inc. is a global diversified industrial company that combines advanced engineering and production capabilities with in-depth materials science expertise to design and manufacture high-precision components and assemblies for the medical, aerospace and defense, electrical, automotive, and general industrial markets. As used in this Quarterly Report on Form 10-Q (this “Quarterly Report), the terms “NN,” the “Company,” “we,” “our,” or “us” refer to NN, Inc., and its subsidiaries. As of June 30, 2019, we had 51 facilities in North America, Europe, South America, and China. Basis of Presentation The accompanying condensed consolidated financial statements have not been audited, except that the Condensed Consolidated Balance Sheet as of December 31, 2018, was derived from the audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 (the “2018 Annual Report”), which we filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 18, 2019. In management’s opinion, the accompanying unaudited condensed consolidated financial statements reflect all adjustments necessary to fairly state our results of operations for the three and six months ended June 30, 2019 and 2018; financial position as of June 30, 2019, and December 31, 2018; and cash flows for the six months ended June 30, 2019 and 2018, on a basis consistent with our audited consolidated financial statements other than the adoption of new accounting standards, such as the new lease standard (see Note 10). These adjustments are of a normal recurring nature and are, in the opinion of management, necessary to state fairly the Company’s financial position and operating results for the interim periods. Certain information and footnote disclosures normally included in the consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted from the interim financial statements presented in this Quarterly Report. These unaudited condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and accompanying notes included in the 2018 Annual Report. The results for the three and six months ended June 30, 2019, are not necessarily indicative of results for the year ending December 31, 2019, or any other future periods. Except for per share data or as otherwise indicated, all U.S. dollar amounts presented in the tables in these Notes to Condensed Consolidated Financial Statements are in thousands. Accounting Standards Recently Adopted Leases. On January 1, 2019, we adopted Accounting Standards Codification (“ASC”) 842, Leases, which superseded ASC 840, Leases. We adopted ASC 842 utilizing the modified retrospective transition approach; therefore, historical financial information and disclosures do not reflect the new standard and will continue to be presented under the previous lease accounting guidance. Under the modified retrospective transition method, we recognized the cumulative effect of the initial adoption adjustment to the opening balance of retained deficit as of January 1, 2019. The adoption adjustment to retained deficit was $0.1 million. As part of the adoption of ASC 842, we elected the package of practical expedients, the short-term lease exemption, and the practical expedient to not separate lease and non-lease components. We recorded lease-related assets and liabilities to our balance sheet for leases with terms greater than twelve months that were classified as operating leases and not previously recorded on our balance sheet. See Note 10 for the required disclosures related to ASC 842. Derivatives and Hedging. In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, (“ASU 2017-12”). ASU 2017-12 provides new rules that expand the hedging strategies that qualify for hedge accounting. The new rules also allow additional time to complete hedge effectiveness testing and allow qualitative assessments subsequent to initial quantitative tests if there is a supportable expectation that the hedge will remain highly effective. We adopted the guidance on January 1, 2019. We have applied the new rules to 2019 hedging activities as disclosed in Note 16 to these condensed consolidated financial statements. The new guidance has no effect on our historical financial statements. Effects of Tax Reform in Other Comprehensive Income. In February 2018, the FASB issued guidance related to the impacts of the U.S. Tax Cuts and Jobs Act of 2017 (“Tax Act”). Under existing U.S. GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income (“AOCI”) are adjusted, certain tax effects become stranded in AOCI. The FASB issued ASU 2018-2, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that permits reclassification of certain income tax effects of the Tax Act from AOCI to retained earnings. The guidance also requires certain disclosures about stranded tax effects. The new guidance was effective for us on January 1, 2019. We adopted the new guidance at the beginning of the period of adoption. The new guidance had no effect on our financial statements. Accounting Standards Not Yet Adopted Fair Value Disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, that modifies fair value disclosure requirements. The new guidance could impact us by streamlining disclosures of Level 3 fair value measurements. The modified disclosures are effective for us beginning in the first quarter of 2020, with early adoption allowed. ASU 2018-13 changes disclosures only and does not impact our financial condition, results of operations, or cash flows. We are in the process of evaluating the effects of this guidance on our fair value disclosures. Internal-Use Software. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software: Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force), that provides guidance on a customer’s accounting for implementation, set-up, and other upfront costs incurred in a cloud computing arrangement that is hosted by the vendor. Under the new guidance, customers will apply the same criteria for capitalizing implementation costs as they would for an arrangement that has a software license. ASU 2018-15 is effective for us on January 1, 2020, using either a prospective or retrospective approach and with early adoption permitted. We are in the process of evaluating the effects of this guidance on our financial statements. Financial Instruments - Credit Losses. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which modifies the measurement of expected credit losses on certain financial instruments and the timing of when such losses are recorded. ASU 2016-13 is effective for us on January 1, 2020, using a modified retrospective approach, with early adoption permitted. We are in the process of evaluating the effects of this guidance on our financial statements.

Interim Financial Statements

Nature of Business

NN, Inc. is a global diversified industrial company that combines advanced engineering and production capabilities with in-depth materials science expertise to design and manufacture high-precision components and assemblies for the medical, aerospace and defense, electrical, automotive, and general industrial markets. As used in this Quarterly Report on Form 10-Q (this “Quarterly Report), the terms “NN,” the “Company,” “we,” “our,” or “us” refer to NN, Inc., and its subsidiaries. As of June 30, 2019, we had 51 facilities in North America, Europe, South America, and China.

Basis of Presentation

The accompanying condensed consolidated financial statements have not been audited, except that the Condensed Consolidated Balance Sheet as of December 31, 2018, was derived from the audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 (the “2018 Annual Report”), which we filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 18, 2019. In management’s opinion, the accompanying unaudited condensed consolidated financial statements reflect all adjustments necessary to fairly state our results of operations for the three and six months ended June 30, 2019 and 2018; financial position as of June 30, 2019, and December 31, 2018; and cash flows for the six months ended June 30, 2019 and 2018, on a basis consistent with our audited consolidated financial statements other than the adoption of new accounting standards, such as the new lease standard (see Note 10). These adjustments are of a normal recurring nature and are, in the opinion of management, necessary to state fairly the Company’s financial position and operating results for the interim periods.

Certain information and footnote disclosures normally included in the consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted from the interim financial statements presented in this Quarterly Report. These unaudited condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and accompanying notes included in the 2018 Annual Report. The results for the three and six months ended June 30, 2019, are not necessarily indicative of results for the year ending December 31, 2019, or any other future periods.

Except for per share data or as otherwise indicated, all U.S. dollar amounts presented in the tables in these Notes to Condensed Consolidated Financial Statements are in thousands.

Accounting Standards Recently Adopted

Leases. On January 1, 2019, we adopted Accounting Standards Codification (“ASC”) 842, Leases, which superseded ASC 840, Leases. We adopted ASC 842 utilizing the modified retrospective transition approach; therefore, historical financial information and disclosures do not reflect the new standard and will continue to be presented under the previous lease accounting guidance. Under the modified retrospective transition method, we recognized the cumulative effect of the initial adoption adjustment to the opening balance of retained deficit as of January 1, 2019. The adoption adjustment to retained deficit was $0.1 million. As part of the adoption of ASC 842, we elected the package of practical expedients, the short-term lease exemption, and the practical expedient to not separate lease and non-lease components. We recorded lease-related assets and liabilities to our balance sheet for leases with terms greater than twelve months that were classified as operating leases and not previously recorded on our balance sheet. See Note 10 for the required disclosures related to ASC 842.

Derivatives and Hedging. In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, (“ASU 2017-12”). ASU 2017-12 provides new rules that expand the hedging strategies that qualify for hedge accounting. The new rules also allow additional time to complete hedge effectiveness testing and allow qualitative assessments subsequent to initial quantitative tests if there is a supportable expectation that the hedge will remain highly effective. We adopted the guidance on January 1, 2019. We have applied the new rules to 2019 hedging activities as disclosed in Note 16 to these condensed consolidated financial statements. The new guidance has no effect on our historical financial statements.

Effects of Tax Reform in Other Comprehensive Income. In February 2018, the FASB issued guidance related to the impacts of the U.S. Tax Cuts and Jobs Act of 2017 (“Tax Act”). Under existing U.S. GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income (“AOCI”) are adjusted, certain tax effects become stranded in AOCI. The FASB issued ASU 2018-2, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that permits reclassification of certain income tax effects of the Tax Act from AOCI to retained earnings. The guidance also requires certain disclosures about stranded tax effects. The new guidance was effective for us on January 1, 2019. We adopted the new guidance at the beginning of the period of adoption. The new guidance had no effect on our financial statements.

Accounting Standards Not Yet Adopted

Fair Value Disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, that modifies fair value disclosure requirements. The new guidance could impact us by streamlining disclosures of Level 3 fair value measurements. The modified disclosures are effective for us beginning in the first quarter of 2020, with early adoption allowed. ASU 2018-13 changes disclosures only and does not impact our financial condition, results of operations, or cash flows. We are in the process of evaluating the effects of this guidance on our fair value disclosures.

Internal-Use Software. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software: Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force), that provides guidance on a customer’s accounting for implementation, set-up, and other upfront costs incurred in a cloud computing arrangement that is hosted by the vendor. Under the new guidance, customers will apply the same criteria for capitalizing implementation costs as they would for an arrangement that has a software license. ASU 2018-15 is effective for us on January 1, 2020, using either a prospective or retrospective approach and with early adoption permitted. We are in the process of evaluating the effects of this guidance on our financial statements.

Financial Instruments - Credit Losses. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which modifies the measurement of expected credit losses on certain financial instruments and the timing of when such losses are recorded. ASU 2016-13 is effective for us on January 1, 2020, using a modified retrospective approach, with early adoption permitted. We are in the process of evaluating the effects of this guidance on our financial statements.