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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, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
 [2]
Sep. 30, 2016
 [3]
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Net Income $ 19,100 $ 31,700 $ 22,200 $ 10,000 $ 4,100 $ 10,000 $ 19,200 $ 5,000 $ 82,957 $ 38,254 $ 52,182
Computation of basic and diluted net income per common share                      
Weighted average common shares outstanding during the period (for basic calculation)                 38,623 38,761 39,239
Dilutive effect of other potential common shares                 451 164 116
Weighted average common shares and potential common shares (for diluted calculation)                 39,074 38,925 39,355
Net income per common share - Basic $ 0.49 $ 0.82 $ 0.57 $ 0.26 $ 0.11 $ 0.26 $ 0.50 $ 0.13 $ 2.15 $ 0.99 $ 1.33
Net income per common share - Diluted $ 0.49 $ 0.81 $ 0.57 $ 0.26 $ 0.11 $ 0.26 $ 0.49 $ 0.13 $ 2.12 $ 0.98 $ 1.33
Stock Awards [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive stock awards                 0 200 100
[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.