| Significant Accounting Policies [Text Block] | Summary of Significant Accounting Policies Accounting Policies The complete summary of significant accounting policies is included in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Item 8. Financial Statements and Supplementary Data" in our 2017 Form 10-K. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets, and other long-lived assets; legal contingencies; guarantee obligations; indemnifications; assumptions used in retirement, medical, and workers' compensation benefits; stock-based compensation; fair value measurements; income taxes; and vendor and customer rebates, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates resulting from continuing changes in the economic environment will be reflected in the consolidated financial statements in future periods. Vendor Rebates and Allowances We receive rebates and allowances from our vendors under a number of different programs, including vendor marketing programs. At September 30, 2018 , and December 31, 2017 , we had $9.3 million and $6.7 million , respectively, of vendor rebates and allowances recorded in "Receivables, Other" on our Consolidated Balance Sheets. Rebates and allowances received from our vendors are recognized as a reduction of "Materials, labor, and other operating expenses (excluding depreciation)" when the product is sold, unless the rebates and allowances are linked to a specific incremental cost to sell a vendor's product. Amounts received from vendors that are linked to specific selling and distribution expenses are recognized as a reduction of "Selling and distribution expenses" in the period the expense is incurred. Leases We lease a portion of our distribution centers as well as other property and equipment under operating leases. For purposes of determining straight-line rent expense, the lease term is calculated from the date we first take possession of the facility, including any periods of free rent and any renewal option periods we are reasonably assured of exercising. Rental expense for operating leases was $4.6 million and $4.8 million for the three months ended September 30, 2018 and 2017 , respectively, and $13.8 million and $14.4 million for the nine months ended September 30, 2018 and 2017 , respectively. Sublease rental income was not material in any of the periods presented. We also have leases of certain distribution centers recorded as capital leases. During the nine months ended September 30, 2018 , we recorded two new capital leases for distribution centers with initial lease terms 13 and 20 years, respectively, in the amount of $18.9 million , which represents non-cash investing and financing activities. At September 30, 2018 , and December 31, 2017 , we had $22.1 million and $3.9 million , respectively, of capital lease obligations recorded in "Other long-term liabilities" on our Consolidated Balance Sheets. Inventories Inventories included the following (work in process is not material): September 30, December 31, (thousands) Finished goods and work in process $ 473,584 $ 377,266 Logs 46,307 57,229 Other raw materials and supplies 39,552 42,178 $ 559,443 $ 476,673 ___________________________________ (a) As of September 30, 2018 , certain inventories have been classified as assets held for sale and excluded from these inventory balances. For more information, see Note 6, Assets Held for Sale. Property and Equipment Property and equipment consisted of the following asset classes: September 30, December 31, (thousands) Land $ 39,307 $ 38,606 Buildings (b) 159,844 144,404 Improvements 58,720 55,267 Mobile equipment, information technology, and office furniture 151,939 138,245 Machinery and equipment 641,513 659,708 Construction in progress 25,018 23,303 1,076,341 1,059,533 Less accumulated depreciation (523,675 ) (493,741 ) $ 552,666 $ 565,792 ___________________________________ (a) As of September 30, 2018 , certain property and equipment have been classified as assets held for sale and excluded from these property and equipment balances. For more information, see Note 6, Assets Held for Sale. (b) Capital lease assets are included in the 'Buildings' asset class. Long-Lived Asset Impairment We review long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of assets may not be recoverable. An impairment of long-lived assets exists when the carrying value is not recoverable through future undiscounted cash flows from operations and when the carrying value of an asset or asset group exceeds its fair value. For a description of the impairment loss recorded during the three months ended September 30, 2018, see Note 6, Assets Held for Sale. Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy under GAAP gives the highest priority to quoted market prices (Level 1) and the lowest priority to unobservable inputs (Level 3). In general, and where applicable, we use quoted prices in active markets for identical assets or liabilities to determine fair value (Level 1). If quoted prices in active markets for identical assets or liabilities are not available to determine fair value, we use quoted prices for similar assets and liabilities or inputs that are observable either directly or indirectly (Level 2). If quoted prices for identical or similar assets are not available or are unobservable, we may use internally developed valuation models, whose inputs include bid prices, and third-party valuations utilizing underlying asset assumptions (Level 3). Financial Instruments Our financial instruments are cash and cash equivalents, accounts receivable, accounts payable, long-term debt, and interest rate swaps. Our cash is recorded at cost, which approximates fair value, and our cash equivalents are money market funds. As of September 30, 2018 , and December 31, 2017 , we held $139.9 million and $137.5 million , respectively, in money market funds that are measured at fair value on a recurring basis using Level 1 inputs. The recorded values of accounts receivable and accounts payable approximate fair values based on their short-term nature. At September 30, 2018 , and December 31, 2017 , the book value of our fixed-rate debt for each period was $350.0 million , and the fair value was estimated to be $356.1 million and $369.3 million , respectively. The difference between the book value and the fair value is derived from the difference between the period-end market interest rate and the stated rate of our fixed-rate, long-term debt. We estimated the fair value of our fixed-rate debt using quoted market prices of our debt in inactive markets (Level 2 inputs). The interest rate on our term loans is based on market conditions such as the London Interbank Offered Rate (LIBOR) or a base rate. Because the interest rate on the term loans is based on current market conditions, we believe that the estimated fair value of the outstanding balance on our term loans approximates book value. As discussed below, we also have interest rate swaps to mitigate our variable interest rate exposure, the fair value of which is measured based on Level 2 inputs. Interest Rate Risk and Interest Rate Swaps We are exposed to interest rate risk arising from fluctuations in variable-rate LIBOR on our term loans and when we have loan amounts outstanding on our revolving credit facility. Our objective is to limit the variability of interest payments on our debt. To meet this objective, in 2016 we entered into receive-variable, pay-fixed interest rate swaps to change the variable-rate cash flow exposure to fixed-rate cash flows. In accordance with our risk management strategy, we actively monitor our interest rate exposure and use derivative instruments from time to time to manage the related risk. On February 16, 2016, and March 31, 2016, we entered into interest rate swap agreements with notional principal amounts of $50.0 million and $75.0 million , respectively, to offset risks associated with the variability in cash flows relating to interest payments that are based on one-month LIBOR. We do not speculate using derivative instruments. At September 30, 2018 , and December 31, 2017 , the notional principal amount of our interest rate swap agreements exceeded the $95.0 million of variable-rate debt outstanding after paying down $30.0 million of variable rate debt on our term loan in December 2016. The excess notional principal amount of our interest rate swaps over our variable-rate debt is within our management strategy as we have partially funded seasonal and intra-month working capital requirements from borrowings under our revolving credit facility. Under the interest rate swaps, we receive LIBOR-based variable interest rate payments and make fixed interest rate payments, thereby fixing the interest rate on $125.0 million of variable rate debt exposure. Payments on the interest rate swaps with notional principal amounts of $50.0 million and $75.0 million are due on a monthly basis at an annual fixed rate of 1.007% and 1.256% , respectively, and expire in February 2022 and March 2022, respectively. The interest rate swap agreements were not designated as cash flow hedges, and as a result, all changes in the fair value are recognized in "Change in fair value of interest rate swaps" in the Consolidated Statements of Operations rather than through other comprehensive income. At September 30, 2018 , and December 31, 2017 , we recorded long-term assets of $7.2 million and $4.7 million , respectively, in "Other assets" on our Consolidated Balance Sheets, representing the fair value of the interest rate swap agreements. The swaps were valued based on observable inputs for similar assets and liabilities and other observable inputs for interest rates and yield curves (Level 2 inputs). Concentration of Credit Risk We are exposed to credit risk related to customer accounts receivable. In order to manage credit risk, we consider customer concentrations and current economic trends and monitor the creditworthiness of significant customers based on ongoing credit evaluations. At September 30, 2018 , receivables from two customers accounted for approximately 13% and 12% , respectively, of total receivables. At December 31, 2017 , receivables from two customers accounted for approximately 15% and 12% , respectively, of total receivables. No other customer accounted for 10% or more of total receivables. New and Recently Adopted Accounting Standards In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . This ASU provides guidance on implementation costs incurred in a cloud computing arrangement (CCA) that is a service contract. The guidance aligns the accounting for such costs with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Specifically, the ASU amends ASC 350 to include in its scope implementation costs of a CCA that is a service contract and clarifies that a customer should apply ASC 350-40 to determine which implementation costs should be capitalized in such a CCA. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2019, with early adoption permitted. The amendments should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We are currently evaluating the effects of this ASU on our financial statements. In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans . This ASU amends ASC 715 to remove disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant related to defined benefit pension and other postretirement plans. The ASU's changes related to disclosures are part of the FASB's disclosure framework project. The updated guidance is effective retrospectively for annual reporting periods ending after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this ASU on our disclosures in the notes to our financial statements. 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 . This ASU amends ASC 820 to remove disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant related to recurring and nonrecurring fair value measurements. The ASU's changes related to disclosures are part of the FASB's disclosure framework project. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2019, with early adoption permitted. We are currently evaluating the effects of this ASU on our disclosures in the notes to our financial statements. In March 2018, the FASB issued ASU 2018-05, Income Taxes (Topic 740), Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 . The amendments in this ASU add various Securities and Exchange Commission (SEC) paragraphs pursuant to the issuance of SEC Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (Tax Act) (SAB 118). The SEC issued SAB 118 to address concerns about reporting entities' ability to timely comply with the accounting requirements to recognize all of the effects of the Tax Act in the period of enactment. SAB 118 allows disclosure that timely determination of some or all of the income tax effects from the Tax Act are incomplete by the due date of the financial statements and, if possible, to provide a reasonable estimate. See Note 4, Income Taxes, for our assessment of the income tax effects of the Tax Act. In February 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . This ASU permits entities to reclassify stranded tax effects in accumulated other comprehensive income to retained earnings as a result of the Tax Cuts and Jobs Act enacted by the U.S. federal government on December 22, 2017. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. We anticipate adopting this ASU by the end of fourth quarter 2018 and do not expect the adoption of this guidance to have a material effect on our financial statements. In March 2017, the FASB issued ASU 2017-07 , Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . This ASU requires entities to present the service cost component of net periodic benefit cost in the same income statement line item(s) as other employee compensation costs arising from services rendered during the period. The other components of net periodic benefit cost must be presented elsewhere in the income statement and outside of income from operations if that subtotal is presented. Entities will have to disclose the line(s) used to present the other components of net periodic benefit cost if the components are not presented separately in the income statement. The guidance on the income statement presentation of the components of net periodic benefit cost must be applied retrospectively. We adopted the standard in first quarter 2018, which resulted in a change in our income from operations in an amount equal to the other components of net periodic pension cost, which was offset by a corresponding change outside of income from operations. The amount recorded outside of income from operations is presented in "Pension expense (excluding service costs)" in our Consolidated Statements of Operations. The components of net periodic cost are shown in Note 9, Retirement and Benefit Plans. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . This amendment requires a lessee to recognize a right-of-use (ROU) asset and an associated lease liability on the balance sheet for all leases (whether operating or finance leases) with a term longer than 12 months. For leases defined as finance leases under the new standard, the lessee subsequently recognizes interest expense and amortization of the ROU asset, similar to accounting for capital leases under current GAAP. For leases defined as operating leases under the new standard, the lessee subsequently recognizes straight-line lease expense over the life of the lease. This new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The guidance is to be applied using a modified retrospective transition method. An entity may choose to use either its effective date or the beginning of the earliest comparative period presented in the financial statements as its date of initial application. We expect to adopt the new standard on January 1, 2019 and use the effective date as our date of initial application. Consequently, financial information will not be updated and the disclosures required under the new standard will not be provided for dates and periods before January 1, 2019. The new standard provides a number of optional practical expedients in transition. We expect to elect the ‘package of practical expedients’, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification, and initial direct costs. We do not expect to elect the use-of-hindsight. The new standard also provides practical expedients for an entity’s ongoing accounting. We currently expect to elect the short-term lease recognition exemption for all leases that qualify. This means, for those leases that qualify, we will not recognize ROU assets or lease liabilities, and this includes not recognizing ROU assets or lease liabilities for existing short-term leases of those assets in transition. We also currently expect to elect the practical expedient to not separate lease and non-lease components for all of our leases. The adoption of this ASU will result in a material increase to our balance sheet for lease liabilities and ROU assets for operating leases, substantially all of which are real estate leases. The extent of the increase to assets and liabilities associated with these amounts remains to be determined pending our analysis of existing lease contracts. We are in the process of implementing changes to our systems and control processes in conjunction with our review of existing lease agreements and anticipate these changes will go into effect when we adopt this standard. We are also in the process of evaluating the impact on our lease disclosures, but anticipate additional required disclosure. We will continue to monitor potential changes to Topic 842 that have been proposed by the FASB and assess any necessary changes to the implementation process as the guidance is updated. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . This ASU replaced most existing revenue recognition guidance in U.S. GAAP when it became effective and requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The guidance also requires additional disclosure to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. We adopted this standard effective January 1, 2018. See Note 3, Revenues, for the impact of this standard on our revenue recognition practices and additional required qualitative disclosures of our revenue recognition policies. There were no other accounting standards recently issued that had or are expected to have a material impact on our consolidated financial statements and associated disclosures. Disclosure Update and Simplification In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification , amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. The amendments include removing the requirement to disclose the historical and pro forma ratio of earnings to fixed charges and the related exhibit, as well as, replacing the requirement to disclose the high and low trading prices of our common stock with a requirement to disclosure the ticker symbol of our common stock. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement, as well as the amount of dividends per share for each class of shares. This final rule is effective 30 days after publication in the Federal Register. The final rule was not yet published in the Federal Register as of the date of this Quarterly Report on Form 10-Q. However, on September 25, 2018, the SEC released guidance advising it will not object to a registrant adopting the requirement to include changes in stockholders’ equity in the Form 10-Q for the first quarter beginning after the effective date of the rule (first quarter 2019 for a calendar year-end company). We are currently evaluating the impact of this guidance on our disclosures. Reclassifications Certain amounts in prior year's consolidated financial statements have been reclassified to conform with current year's presentation, none of which were considered material. |
