Income taxes.

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Increase (decrease) deferred tax liabilities.

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- Definition

Investment tax credit expiration year.

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Tax cuts and jobs act, change in net deferred tax assets including valuation allowance.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Statutory Federal Income Tax Rate	21.00%	35.00%	35.00%
Reduction in net deferred tax assets including valuation allowance			$ 10,500,000
Net tax benefit	$ (1,010,000)	$ (19,199,000)	(32,021,000)
Valuation allowance	395,000	790,000
Unrecognized tax benefits that would impact effective tax rate	0
Unrecognized tax benefits	0	564,000	$ 564,000
Idaho [Member]
Income Taxes [Line Items]
Investment Tax Credits	2,800,000
Valuation allowance	$ 400,000
Earliest Tax Year [Member] \| Idaho [Member]
Income Taxes [Line Items]
Idaho Investment Tax Credits expiration year	2022
Latest Tax Year [Member] \| Idaho [Member]
Income Taxes [Line Items]
Idaho Investment Tax Credits expiration year	2033
Federal [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 0
State and Local [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	0
Pension Plans [Member] \| Qualified Plan [Member]
Income Taxes [Line Items]
Net tax benefit		$ 5,000,000.0
Deltic MDF Facility [Member]
Income Taxes [Line Items]
Reduction to deferred tax liabilities	(15,800,000)
Increase to income taxes payable	$ 15,800,000