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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 37,300 | $ 43,100
Accrued interest payable related to uncertain tax positions | 163 | $ 159
Undistributed earnings of domestic subsidiaries | 35,100 |
Additional taxes if interest in all businesses is sold rather than to effect a tax-free liquidation | $ 8,400 |
Maximum [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses expiration year | 2040 |
Minimum [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses expiration year | 2025 |

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- Definition Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of domestic subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount of undistributed earnings of domestic subsidiaries or domestic joint ventures intended to be permanent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121573983&loc=d3e28200-109314 + Details
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