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Quarterly Results of Operations (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Nov. 01, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                        
Sales   $ 1,092,000 [1] $ 1,226,600 $ 1,138,900 $ 974,400 $ 919,500 [2] $ 1,067,200 [3] $ 1,043,800 $ 880,700 $ 4,431,991 $ 3,911,215 $ 3,633,415
Income (loss) from operations   21,600 [1] 56,000 42,400 21,100 (3,000) [2] 31,300 [3] 37,900 13,400 141,153 79,578 103,189
Net Income   $ 19,100 [1] $ 31,700 $ 22,200 $ 10,000 $ 4,100 [2] $ 10,000 [3] $ 19,200 $ 5,000 $ 82,957 $ 38,254 $ 52,182
Net income per common share - Basic   $ 0.49 [1] $ 0.82 $ 0.57 $ 0.26 $ 0.11 [2] $ 0.26 [3] $ 0.50 $ 0.13 $ 2.15 $ 0.99 $ 1.33
Net income per common share - Diluted   $ 0.49 [1] $ 0.81 $ 0.57 $ 0.26 $ 0.11 [2] $ 0.26 [3] $ 0.49 $ 0.13 $ 2.12 $ 0.98 $ 1.33
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax Expense (Benefit)   $ (8,100)               $ (8,100)    
Tax Cuts and Jobs Acts of 2017 Incomplete Accounting Provisional Income Tax Benefit, per share   $ 0.21                    
Loss on extinguishment of debt           $ (3,000) $ (5,900)     0 $ (14,304) $ 0
Loss on extinguishment of debt, per share, net of tax           $ (0.08) $ (0.15)          
Change in valuation allowance           $ (8,500)       0 [4] (9,884) [4] 0 [4]
Change in valuation allowance, per share           $ 0.22            
Pension plan settlement expense $ (3,900)         $ (2,400)       $ 0 $ (4,155) [5] $ (501)
Pension plan settlement expense, per share, net of tax           $ (0.06)            
[1] Fourth quarter 2017 results include an $8.1 million, or $0.21 per share, income tax benefit associated with the effects of the Tax Cuts and Jobs Act discussed further in Note 3, Income Taxes.
[2] The following items impacted fourth quarter 2016 results:•$8.5 million, or $0.22 per share, income tax benefit primarily associated with the reversal of a valuation allowance on foreign deferred tax assets, net of other tax adjustments. For more information, see Note 3, Income Taxes.•$3.0 million, $0.08 per share, after-tax loss on the extinguishment of debt, as we refinanced our senior notes. For more information, see Note 7, Debt.•$2.4 million, or $0.06 per share, after-tax settlement expense associated with voluntary lump-sum payments to pension plan participants. For more information, see Note 9, Retirement and Benefit Plans.
[3] Third quarter 2016 results include a $5.9 million, or $0.15 per share, after-tax loss on the extinguishment of debt, as we refinanced our senior notes. For more information, see Note 7, Debt.
[4] Deferred tax assets in our foreign subsidiaries are primarily the result of net operating losses. As of each reporting date, management considers new evidence, both positive and negative, that could affect its view of the future realization of deferred tax assets. During fourth quarter 2016, because we achieved three years of cumulative pretax income in the Canadian tax jurisdiction and due to the implementation of a tax-planning strategy, management determined that there is sufficient positive evidence to conclude that it is more likely than not that the deferred tax assets are realizable and therefore released the valuation allowance in the amount of $9.9 million.
[5] 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.