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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 9,650	$ (814)	$ 22,601	$ 22,811
Effective income tax rate (as a percent)	26.20%	(6.20%)	25.40%	19.70%
Statutory U.S. income tax rate (as a percent)	21.00%	21.00%	21.00%	21.00%
Income before income taxes	$ 36,821	$ 13,034	$ 88,879	$ 115,534
Deferred income tax expense (benefit)		(3,800)	10,008	883
Pension contributions		$ 20,000	1,324	21,566
Income taxes paid (refunds), net			$ (7,100)	$ 14,400

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