Investments in affiliated companies in which the Company shares control over the financial and operating decisions, but in which the Company is not the primary beneficiary, are accounted for by the equity method of accounting. Income applicable to these equity investments is reflected in “Equity in earnings of affiliates, net of tax” in the Consolidated Statements of Income. The aggregate carrying value of equity investments is reported in “Other Assets” in the Company’s Consolidated Balance Sheets and totaled $54,339 and $55,516 at December 31, 2019 and 2018, respectively.

Also included in the investment totals above is the Company’s 19.5% ownership in a small tubes and cores business in Chile and its 12.19% ownership in a small paper recycling business in Finland. These investments are accounted for under the cost method as the Company does not have the ability to exercise significant influence over them.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Beginning in 2018, the Company records revenue when control is transferred to the customer, which is either upon shipment or over time in cases where the Company is entitled to payment with margin for products produced that are customer specific without alternative use. The Company recognizes over time revenue under the input method as goods are produced. Revenue that is recognized at a point in time is recognized when the customer obtains control of the goods. Customers obtain control either when goods are delivered to the customer facility, if the Company is responsible for arranging transportation, or when picked up by the customer's designated carrier. The Company commonly enters into Master Supply Arrangements (MSA) with customers to provide goods and/or services over specific time periods. Customers submit purchase orders with quantities and prices to create a contract for accounting purposes. Shipping and handling expenses are considered a fulfillment cost, and included in "Cost of Sales," and freight charged to customers is included in "Net Sales" in the Company's Consolidated Statements of Income.

Prior to 2018, the Company recorded revenue when title and risk of ownership passed to the customer, and when persuasive evidence of an arrangement existed, delivery had occurred or services had been rendered, the sales price to the customer was fixed or determinable and when collectibility was reasonably assured. Certain judgments, such as provisions for estimates of sales returns and allowances, were required in the application of the Company’s revenue policy and, therefore, were included in the results of operations in its Consolidated Financial Statements. Shipping and handling expenses were included in “Cost of sales,” and freight charged to customers was included in “Net sales” in the Company’s Consolidated Statements of Income for the year ended December 31, 2017.

The Company has rebate agreements with certain customers. These rebates are recorded as reductions of sales and are accrued using sales data and rebate percentages specific to each customer agreement. Accrued customer rebates are included in "Accrued expenses and other" in the Company's Consolidated Balance Sheets.

Payment terms under the Company's arrangements are short term in nature, generally no longer than 120 days. The Company does provide prompt payment discounts to certain customers if invoices are paid within a predetermined period. Prompt payment discounts are treated as a reduction of revenue and are determinable within a short period after the originating sale.

The Company’s trade accounts receivable are non-interest bearing and are recorded at the invoiced amounts. The allowance for doubtful accounts represents the Company’s best estimate of the amount of probable credit losses in existing accounts receivable. Provisions are made to the allowance for doubtful accounts at such time that collection of all or part of a trade account receivable is in question. The allowance for doubtful accounts is monitored on a regular basis and adjustments are made as needed to ensure that the account properly reflects the Company’s best estimate of uncollectible trade accounts receivable. Account balances are charged off against the allowance for doubtful accounts when the Company determines that the receivable will not be recovered.

Sales to the Company’s largest customer accounted for approximately 5% of the Company’s net sales in 2019, 4% in 2018 and 4% in 2017, primarily in the Display and Packaging and Consumer Packaging segments. Receivables from this customer accounted for approximately 8% of the Company’s total trade accounts receivable at December 31, 2019 and 4% at December 31, 2018. The Company’s next largest customer comprised approximately 4% of the Company’s net sales in 2019, 4% in 2018 and 3% in 2017.

Certain of the Company’s customers sponsor and actively promote multi-vendor supply chain finance arrangements and, in a limited number of cases, the Company has agreed to participate. Accordingly, approximately 9% of consolidated annual sales were settled under these arrangements in both 2019 and 2018.

Research and development costs are charged to expense as incurred and include salaries and other directly related expenses. Research and development costs totaling approximately $23,300 in 2019, $23,200 in 2018 and $21,000 in 2017 are included in “Selling, general and administrative expenses” in the Company’s Consolidated Statements of Income.

Costs associated with exit or disposal activities are recognized when the liability is incurred. If assets become impaired as a result of a restructuring action, the assets are written down to fair value, less estimated costs to sell, if applicable. A number of significant estimates and assumptions are involved in the determination of fair value. The Company considers historical experience and all available information at the time the estimates are made; however, the amounts that are ultimately realized upon the sale of divested assets may differ from the estimated fair values reflected in the Company’s Consolidated Financial Statements.

Plant assets represent the original cost of land, buildings and equipment, less depreciation, computed under the straight-line method over the estimated useful lives of the assets, and are reviewed for impairment whenever events indicate the carrying value may not be recoverable. Equipment lives generally range from 3 to 11 years, and buildings from 15 to 40 years.

The Company assesses its goodwill for impairment annually during the third quarter, or from time to time when warranted by the facts and circumstances surrounding individual reporting units or the Company as a whole. In performing the impairment test, the Company compares the fair value of the reporting unit with its carrying amount and recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. This quantitative test considers factors such as the amount by which estimated fair value exceeds current carrying value, current year operating performance as compared to prior projections, and implied fair values from comparable trading and transaction multiples.

When the Company estimates the fair value of a reporting unit, it does so using a discounted cash flow model based on projections of future years' operating results and associated cash flows, corroborated by comparable trading and transaction multiples. The Company's projections incorporate management's best estimates of the expected future results, which include expectations related to new and retained business and future operating margins. Projected future cash flows are then discounted to present value using a discount rate management believes is commensurate with the risks inherent in the cash flows.

If the fair value of a reporting unit exceeds the carrying value of the reporting unit’s assets, including goodwill, there is no impairment. If the carrying value of the reporting unit exceeds the fair value of that reporting unit, an impairment charge is recognized for the excess. Goodwill is not amortized.

The Company provides for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting requirements and tax laws. Assets and liabilities are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse.

The Company elected to early adopt Accounting Standards Update (ASU) 2017-12, "Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities," as of January 1, 2018. The Company uses derivatives to mitigate the effect of fluctuations in some of its raw material and energy costs, foreign currencies, and, from time to time, interest rates. The Company purchases commodities such as recovered paper, metal, resins and energy, generally at market or at fixed prices that are established with the vendor as part of the purchase process for quantities expected to be consumed in the ordinary course of business. The Company may enter into commodity futures or swaps to manage the

effect of price fluctuations. The Company may use foreign currency forward contracts and other risk management instruments to manage exposure to changes in foreign currency cash flows and the translation of monetary assets and liabilities on the Company’s consolidated financial statements. The Company is exposed to interest-rate fluctuations as a result of using debt as a source of financing for its operations. The Company may from time to time use traditional, unleveraged interest rate swaps to adjust its mix of fixed and variable rate debt to manage its exposure to interest rate movements.

The Company records its derivatives as assets or liabilities on the balance sheet at fair value using published market prices or estimated values based on current price and/or rate quotes and discounted estimated cash flows. Changes in the fair value of derivatives are recognized either in net income or in other comprehensive income, depending on the designated purpose of the derivative. Amounts in accumulated other comprehensive income are reclassified into earnings in the same period or periods during which the hedged forecasted transaction affects earnings. It is the Company’s policy not to speculate in derivative instruments.

The Company’s acquisitions of businesses are accounted for in accordance with ASC 805, "Business Combinations." The Company recognizes the identifiable assets acquired, the liabilities assumed, and any noncontrolling interests in an acquired business at their fair values as of the date of acquisition. Goodwill is measured as the excess of consideration transferred, also measured at fair value, over the net of the acquisition date fair values of the identifiable assets acquired and liabilities assumed. The acquisition method of accounting requires us to make significant estimates and assumptions regarding the fair values of the elements of a business combination as of the date of acquisition, including the fair values of identifiable intangible assets, deferred tax asset valuation allowances, liabilities including those related to debt, pensions and other postretirement plans, uncertain tax positions, contingent consideration and contingencies. This method also requires us to refine these estimates over a measurement period not to exceed one year to reflect new information obtained about facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date. If we are required to adjust provisional amounts that we have recorded for the fair values of assets and liabilities in connection with acquisitions, these adjustments could have a material impact on our financial condition and results of operations.

Significant estimates and assumptions in estimating the fair value of acquired customer relationships, technology, and other identifiable intangible assets include future cash flows that we expect to generate from the acquired assets. If the subsequent actual results and updated projections of the underlying business activity change compared with the assumptions and projections used to develop these values, we could record impairment charges. In addition, we have estimated the economic lives of certain acquired assets and these lives are used to calculate depreciation and amortization expense. If our estimates of the economic lives change, depreciation or amortization expenses could be increased or decreased, or the acquired asset could be impaired.

The Company identifies its reportable segments by evaluating the level of detail reviewed by the chief operating decision maker, gross profit margins, nature of products sold, nature of the production processes, type and class of customer, methods used to distribute products, and nature of the regulatory environment. Of these factors, the Company believes that the most significant in determining the aggregation of operating segments are the nature of the products and the type of customers served.