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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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