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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes [Line Items]
Income tax benefit	$ (453)		$ 952	$ 10,409	$ (639)
Pension settlement charge		$ 43,000		42,988
Pension Plans [Member]
Income Taxes [Line Items]
Income tax benefit				$ 11,200
Increase in deferred tax assets		6,800
Remeasurement of pension plan obligations		$ 26,200
Deltic MDF Facility [Member]
Income Taxes [Line Items]
Reduction to deferred tax liabilities					(15,800)
Increase to income taxes payable					$ 15,800

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