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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
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 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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