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Quarterly Results of Operations (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
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Nov. 01, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan settlement/curtailment expense | $ (3,900) |  |  | $ (11,300) |  | $ (12,000) |  |  |  |  |  |  |  | $ (23,255) | [1] | $ 0 | $ (4,155) | [1]
Net sales |  | $ 1,065,800 | [2] | 1,338,500 | [3] | 1,408,100 | [4] | $ 1,182,800 | $ 1,092,000 | [5] | $ 1,226,600 | $ 1,138,900 | $ 974,400 | 4,995,290 |  | 4,431,991 | 3,911,215 |
Income (loss) from operations |  | (84,300) | [2] | 30,500 | [3] | 74,100 | [4] | 51,800 | 21,700 | [5] | 56,100 | 42,500 | 21,100 | 72,038 |  | 141,413 | 84,691 |
Net income (loss) |  | $ (72,200) | [2] | $ 13,800 | [3] | $ 41,800 | [4] | $ 37,100 | $ 19,100 | [5] | $ 31,700 | $ 22,200 | $ 10,000 | $ 20,477 |  | $ 82,957 | $ 38,254 |
Net income (loss) per common share – Basic |  | $ (1.85) | [2] | $ 0.36 | [3] | $ 1.07 | [4] | $ 0.96 | $ 0.49 | [5] | $ 0.82 | $ 0.57 | $ 0.26 | $ 0.53 |  | $ 2.15 | $ 0.99 |
Net income (loss) per common share – Diluted |  | (1.85) | [2] | 0.35 | [3] | 1.06 | [4] | $ 0.94 | $ 0.49 | [5] | $ 0.81 | $ 0.57 | $ 0.26 | $ 0.52 |  | $ 2.12 | $ 0.98 |
Disposal Group, Loss (Gain) on Disposal |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,314 |  | $ 0 | $ 0 |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | $ 8,100 |  |  |  |  | $ (3,806) |  | $ (8,129) | $ 0 |
Tax Cuts and Jobs Acts of 2017 Incomplete Accounting Provisional Income Tax Benefit, per share |  |  |  |  |  |  |  |  | $ 0.21 |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share – Diluted |  |  |  | $ (0.21) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Loss (Gain) on Disposal |  |  |  | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share – Diluted |  | $ (0.46) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Loss (Gain) on Disposal |  | $ 24,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Curtailment of LVL Production at Roxboro, NC Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share – Diluted |  | $ (1.11) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation |  | $ 57,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share – Diluted |  |  |  | $ (0.21) |  | $ (0.23) |  |  |  |  |  |  |  |  |  |  |  |
[1] | Plan settlement expense during the year ended December 31, 2018 includes $23.3 million of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts. Plan settlement expense during the year ended December 31, 2016 includes a $3.9 million settlement charge related to lump-sum cash payments to certain terminated vested participants in settlement of pension obligations.
[2] | Fourth quarter 2018 results include $57.8 million of pre-tax expenses, or $1.11 per share after-tax, for accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility as discussed in Note 6, Curtailment of Manufacturing Facility. Fourth quarter 2018 also includes $24.0 million of pre-tax losses, or $0.46 per share after-tax, from an impairment loss and other sale related costs on our hardwood plywood facility in Moncure, North Carolina upon being classified as held for sale, as discussed in Note 7, Sale of Manufacturing Facilities.
[3] | Third quarter 2018 results include $11.3 million of pre-tax losses, or $0.21 per share after-tax, from a non-cash pension settlement charge and $11.0 million of pre-tax losses, or $0.21 per share after-tax, from impairment losses on assets held for sale in Northeast Oregon. For additional information, see Note 12, Retirement and Benefit Plans and Note 7, Sale of Manufacturing Facilities.
[4] | Second quarter 2018 results include $12.0 million of pre-tax losses, or $0.23 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans.
[5] | Fourth quarter 2017 results include $8.1 million, or $0.21 per share, income tax benefit associated with the effects of the Tax Act discussed further in Note 4, Income Taxes.

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