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General and Summary of Significant Accounting Policies Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Equity Securities, Amortized Cost Basis | $ 23,967 | $ 39,354
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 0 | 0
Available-for-sale Securities | 23,967 | 39,354
Long-term Investments [Domain] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 0 | 2,025
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 0 | 0
Available-for-sale Securities | 0 | 2,025
Short-term Investments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 23,967 | 37,329
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 0 | 0
Available-for-sale Securities | $ 23,967 | $ 37,329

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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