Recently issued accounting standards	12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]
Recently issued accounting standards	Recently issued accounting standards In May 2014, the Financial Accounting Standards Board ("FASB"), in a joint effort with the International Accounting Standards Board ("IASB"), issued new accounting guidance to clarify the principles for recognizing revenue. This new guidance, as amended by additional guidance issued in 2015 and 2016, is encompassed in FASB Accounting Standards Codification Topic 606, Revenue from Contracts with Customers (“ASC 606”) and is designed to enhance the comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets, and affects any entity that enters into contracts with customers or enters into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards. The new guidance establishes principles for reporting information to users of financial statements about the nature, amount, timing, and uncertainty of revenue and cash flows arising from an entity's contracts with customers. The core principle of the new guidance is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The Company adopted the new standard on January 1, 2018, applying the modified retrospective method to all of its contracts; as a result, the Company recognized the cumulative effect of adopting the guidance as a $1.2 million increase to the Company's opening balance of retained earnings on the adoption date. In addition, in connection with its adoption of the new guidance, the Company reclassified the reserve for product returns from a reduction of receivables to a liability. The reserve for returns and allowances was $4.2 million at December 31, 2018. The adoption of this guidance did not have a material impact on the Company's consolidated results of operations, cash flows and financial position. Additional information and disclosures required by this new standard are contained in Note 3. In February 2016, the FASB issued guidance that will change the requirements for accounting for leases. Under the new guidance, lessees (including lessees under both leases classified as finance leases, which are to be classified based on criteria similar to that applicable to capital leases under previous guidance, and leases classified as operating leases) will recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Under previous guidance, operating leases are not recognized on the balance sheet. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The new guidance must be adopted using a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, subject to certain practical expedients that an entity may elect to apply to the transition. The Company will adopt the new guidance on January 1, 2019 and will recognize the cumulative effect of initially applying the standard, if any, as an adjustment to the Company's opening balance of retained earnings rather than at the earliest comparative period presented in the financial statements. As permitted under the new guidance, the Company has made an accounting policy election not to apply the recognition provisions of the new guidance to short term leases (leases with a lease term of 12 months or less that do not include an option to purchase the underlying asset that the lessee is reasonably certain to exercise); instead, the Company will recognize the lease payments for short term leases on a straight-line basis over the lease term. In addition, the Company has elected to apply certain practical expedients available under the new guidance. As a result, and in connection with the transition to the new guidance, the Company will not reassess (i) whether any expired or existing contracts are or contain leases, (ii) the classification of any expired or existing leases, or (iii) initial direct costs for any existing leases. The Company will apply the practical expedients described above to its entire lease portfolio at the January 1, 2019 adoption date. Furthermore, as permitted under the new guidance, the Company has made, as a practical expedient, an accounting policy election to not separate lease and non-lease components and instead will account for each separate lease component and the non-lease components associated with that lease component as a single lease component. While the Company continues to assess the effect that the new standard will have on its financial position and results of operations, the Company expects to recognize additional assets and corresponding liabilities on the consolidated balance sheets because it maintains an operating lease portfolio at January 1, 2019, the date of adoption of the new standard. The Company has made substantial progress in implementing a new lease accounting system and updating its controls and procedures to enable the Company to aggregate lease data and improve lease accounting processes in a manner that facilitates financial reporting in accordance with the new guidance. The Company estimates that it will recognize a right-to-use asset and corresponding lease liability of approximately $90 to $110 million upon adoption of the new guidance. In October 2016, the FASB issued new guidance requiring companies to recognize the income tax effects of intra-entity sales and transfers of assets, other than inventory, in the income statement as income tax expense (or benefit) in the period in which the transfer occurs. Previously, recognition was prohibited until the assets were sold to an outside party or otherwise utilized. The Company adopted the new standard on January 1, 2018, using the modified retrospective method of adoption; as a result, the Company recognized the cumulative effect of adopting the guidance as a $1.8 million increase to the Company's opening balance of retained earnings on the adoption date. The adoption of this guidance did not have a material impact on the Company's consolidated results of operations, cash flows and financial position. In January 2017, the FASB issued guidance to simplify the quantitative test for goodwill impairment. Under current guidance, if a reporting unit’s carrying value exceeds its fair value, the entity must determine the implied value of goodwill. This determination is made by deducting the fair value of a reporting unit’s identifiable assets and liabilities from the fair value of the reporting unit as a whole as if the reporting unit had just been acquired. Under the new guidance, a determination of the implied value of goodwill will no longer be required; a goodwill impairment will be equal to the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance is effective for fiscal years, and any interim goodwill impairment tests within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed after January 1, 2017. The Company is evaluating the impact of the adoption of this guidance, but currently does not anticipate the guidance will have a material impact on its consolidated financial position or results of operations. In March 2017, the FASB issued guidance for employers that sponsor defined benefit pension or other postretirement benefit plans. The guidance requires that these employers disaggregate specified components of net periodic pension cost and net periodic postretirement benefit cost (collectively, "net benefit cost"). Specifically, the guidance generally requires employers to present in the income statement the service cost component of net benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The Company adopted this guidance on January 1, 2018. The adoption of the guidance did not have a material impact on the consolidated financial statements. In August 2017, the FASB issued guidance with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. The new guidance provides for changes to previous designation and measurement guidance for qualifying hedging relationships and to the method of presenting hedge results. In addition, the new guidance includes certain targeted improvements to ease the application of previous guidance related to the assessment of hedge effectiveness. The new guidance is effective for reporting periods beginning after December 15, 2018, but the guidance permits early adoption, and the Company adopted the guidance effective October 1, 2018; the adoption did not result in any cumulative-effect adjustments to retained earnings. In February 2018, the FASB issued new guidance to address a narrow-scope financial reporting issue that arose as a consequence of United States tax legislation adopted in December 2017 and commonly referred to as the Tax Cuts and Jobs Act ("the TCJA"). Existing guidance requires that deferred tax liabilities and assets be adjusted for a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. The guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income (rather than in net income), such as amounts related to benefit plans and hedging activity. As a result, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects) do not reflect the appropriate tax rate. The new guidance permits a reclassification of these amounts from accumulated other comprehensive income to retained earnings, thereby eliminating the stranded tax effects. The new guidance also requires certain disclosures about the stranded tax effects. The guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new guidance can be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate under the TCJA is recognized. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. From time to time, new accounting guidance issued by the FASB or other standard setting bodies is adopted by the Company as of the specified effective date or, when permitted by the guidance and as determined by the Company, as of an earlier date. The Company has assessed recently issued guidance that is not yet effective, except as noted above, and believes the new guidance that it has assessed will not have a material impact on the Company’s results of operations, cash flows or financial position.

Recently issued accounting standards

In May 2014, the Financial Accounting Standards Board ("FASB"), in a joint effort with the International Accounting Standards Board ("IASB"), issued new accounting guidance to clarify the principles for recognizing revenue. This new guidance, as amended by additional guidance issued in 2015 and 2016, is encompassed in FASB Accounting Standards Codification Topic 606, Revenue from Contracts with Customers (“ASC 606”) and is designed to enhance the comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets, and affects any entity that enters into contracts with customers or enters into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards. The new guidance establishes principles for reporting information to users of financial statements about the nature, amount, timing, and uncertainty of revenue and cash flows arising from an entity's contracts with customers. The core principle of the new guidance is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The Company adopted the new standard on January 1, 2018, applying the modified retrospective method to all of its contracts; as a result, the Company recognized the cumulative effect of adopting the guidance as a $1.2 million increase to the Company's opening balance of retained earnings on the adoption date. In addition, in connection with its adoption of the new guidance, the Company reclassified the reserve for product returns from a reduction of receivables to a liability. The reserve for returns and allowances was $4.2 million at December 31, 2018. The adoption of this guidance did not have a material impact on the Company's consolidated results of operations, cash flows and financial position. Additional information and disclosures required by this new standard are contained in Note 3.

In February 2016, the FASB issued guidance that will change the requirements for accounting for leases. Under the new guidance, lessees (including lessees under both leases classified as finance leases, which are to be classified based on criteria similar to that applicable to capital leases under previous guidance, and leases classified as operating leases) will recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Under previous guidance, operating leases are not recognized on the balance sheet. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The new guidance must be adopted using a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, subject to certain practical expedients that an entity may elect to apply to the transition.

The Company will adopt the new guidance on January 1, 2019 and will recognize the cumulative effect of initially applying the standard, if any, as an adjustment to the Company's opening balance of retained earnings rather than at the earliest comparative period presented in the financial statements.

As permitted under the new guidance, the Company has made an accounting policy election not to apply the recognition provisions of the new guidance to short term leases (leases with a lease term of 12 months or less that do not include an option to purchase the underlying asset that the lessee is reasonably certain to exercise); instead, the Company will recognize the lease payments for short term leases on a straight-line basis over the lease term.

In addition, the Company has elected to apply certain practical expedients available under the new guidance. As a result, and in connection with the transition to the new guidance, the Company will not reassess (i) whether any expired or existing contracts are or contain leases, (ii) the classification of any expired or existing leases, or (iii) initial direct costs for any existing leases. The Company will apply the practical expedients described above to its entire lease portfolio at the January 1, 2019 adoption date. Furthermore, as permitted under the new guidance, the Company has made, as a practical expedient, an accounting policy election to not separate lease and non-lease components and instead will account for each separate lease component and the non-lease components associated with that lease component as a single lease component.

While the Company continues to assess the effect that the new standard will have on its financial position and results of operations, the Company expects to recognize additional assets and corresponding liabilities on the consolidated balance sheets because it maintains an operating lease portfolio at January 1, 2019, the date of adoption of the new standard. The Company has made substantial progress in implementing a new lease accounting system and updating its controls and procedures to enable the Company to aggregate lease data and improve lease accounting processes in a manner that facilitates financial reporting in accordance with the new guidance. The Company estimates that it will recognize a right-to-use asset and corresponding lease liability of approximately $90 to $110 million upon adoption of the new guidance.

In October 2016, the FASB issued new guidance requiring companies to recognize the income tax effects of intra-entity sales and transfers of assets, other than inventory, in the income statement as income tax expense (or benefit) in the period in which the transfer occurs. Previously, recognition was prohibited until the assets were sold to an outside party or otherwise utilized. The Company adopted the new standard on January 1, 2018, using the modified retrospective method of adoption; as a result, the Company recognized the cumulative effect of adopting the guidance as a $1.8 million increase to the Company's opening balance of retained earnings on the adoption date. The adoption of this guidance did not have a material impact on the Company's consolidated results of operations, cash flows and financial position.

In January 2017, the FASB issued guidance to simplify the quantitative test for goodwill impairment. Under current guidance, if a reporting unit’s carrying value exceeds its fair value, the entity must determine the implied value of goodwill. This determination is made by deducting the fair value of a reporting unit’s identifiable assets and liabilities from the fair value of the reporting unit as a whole as if the reporting unit had just been acquired. Under the new guidance, a determination of the implied value of goodwill will no longer be required; a goodwill impairment will be equal to the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance is effective for fiscal years, and any interim goodwill impairment tests within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed after January 1, 2017. The Company is evaluating the impact of the adoption of this guidance, but currently does not anticipate the guidance will have a material impact on its consolidated financial position or results of operations.

In March 2017, the FASB issued guidance for employers that sponsor defined benefit pension or other postretirement benefit plans. The guidance requires that these employers disaggregate specified components of net periodic pension cost and net periodic postretirement benefit cost (collectively, "net benefit cost"). Specifically, the guidance generally requires employers to present in the income statement the service cost component of net benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The Company adopted this guidance on January 1, 2018. The adoption of the guidance did not have a material impact on the consolidated financial statements.

In August 2017, the FASB issued guidance with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. The new guidance provides for changes to previous designation and measurement guidance for qualifying hedging relationships and to the method of presenting hedge results. In addition, the new guidance includes certain targeted improvements to ease the application of previous guidance related to the assessment of hedge effectiveness. The new guidance is effective for reporting periods beginning after December 15, 2018, but the guidance permits early adoption, and the Company adopted the guidance effective October 1, 2018; the adoption did not result in any cumulative-effect adjustments to retained earnings.

In February 2018, the FASB issued new guidance to address a narrow-scope financial reporting issue that arose as a consequence of United States tax legislation adopted in December 2017 and commonly referred to as the Tax Cuts and Jobs Act ("the TCJA"). Existing guidance requires that deferred tax liabilities and assets be adjusted for a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. The guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income (rather than in net income), such as amounts related to benefit plans and hedging activity. As a result, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects) do not reflect the appropriate tax rate. The new guidance permits a reclassification of these amounts from accumulated other comprehensive income to retained earnings, thereby eliminating the stranded tax effects. The new guidance also requires certain disclosures about the stranded tax effects. The guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new guidance can be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate under the TCJA is recognized. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements.

From time to time, new accounting guidance issued by the FASB or other standard setting bodies is adopted by the Company as of the specified effective date or, when permitted by the guidance and as determined by the Company, as of an earlier date. The Company has assessed recently issued guidance that is not yet effective, except as noted above, and believes the new guidance that it has assessed will not have a material impact on the Company’s results of operations, cash flows or financial position.