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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
 [1]
Sep. 30, 2020
 [2]
Jun. 30, 2020
Mar. 31, 2020
 [3]
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net Income $ 26,000 $ 103,200 $ 33,600 $ 12,200 $ 14,600 $ 27,200 $ 27,700 $ 11,400 $ 174,979 $ 80,925 $ 20,477
Computation of basic and diluted net income per common share                      
Weighted average common shares outstanding during the period (for basic calculation)                 39,277 39,039 38,932
Dilutive effect of other potential common shares                 154 203 455
Weighted average common shares and potential common shares (for diluted calculation)                 39,431 39,242 39,387
Net income per common share - Basic $ 0.66 $ 2.62 $ 0.85 $ 0.31 $ 0.37 $ 0.70 $ 0.71 $ 0.29 $ 4.45 $ 2.07 $ 0.53
Net income (loss) per common share – Diluted $ 0.66 $ 2.61 $ 0.85 $ 0.31 $ 0.37 $ 0.69 $ 0.71 $ 0.29 $ 4.44 $ 2.06 $ 0.52
Stock Awards [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive stock awards                 0 100 100
[1] Fourth quarter 2020 results include $6.2 million of pre-tax losses, or $0.12 per share after-tax, from a non-cash pension settlement charge related to the Plan Termination, as discussed in Note 12, Retirement and Benefit Plans. Fourth quarter 2020 results also include $38.8 million, or $0.98 per share, of incremental income tax expense related to the release of stranded tax effects upon Plan Termination, as discussed in Note 4, Income Taxes.
[2] Third quarter 2020 results include $14.0 million of pre-tax losses on extinguishment of debt, or $0.27 per share after-tax, as we refinanced our senior notes at a lower interest rate with an extended maturity, as discussed in Note 10, Debt.
[3] First quarter 2020 results include $15.0 million and $1.7 million, respectively, of pre-tax accelerated depreciation and other curtailment related costs, or $0.32 per share after-tax, related to the permanent curtailment of I-joist production at our Roxboro, North Carolina facility, as discussed in Note 6, Curtailment of Manufacturing Facilities.