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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision (benefit) | $ (814) | $ 18,276 | $ 22,811 | $ 36,489 |
Income before income taxes | 13,034 | $ 49,937 | 115,534 | 100,324 |
Deferred Income Tax Expense (Benefit) | (3,800) |  | 883 | 6,019 |
Pension contributions | $ 20,000 |  | $ 21,566 | $ 1,666 |
Effective income tax rate (as a percent) | (6.20%) | 36.60% | 19.70% | 36.40% |
Statutory U.S. income tax rate (as a percent) | 21.00% | 35.00% | 21.00% | 35.00% | 35.00%
Income taxes paid (refunds), net |  |  | $ 14,400 | $ 15,300 |
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax Expense (Benefit) |  |  |  |  | $ (8,100)

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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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