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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 06, 2020 | Apr. 16, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments fair value, amount less than amortized cost | $ 117,000 |  |  |  |
Investments, impairment charge | 0 | $ 0 |  |  |
Asset impairments | $ 16,683,000 | $ 2,897,000 | $ 56,093,000 |  |
US Treasury Securities [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment maturity term | 16 months |  |  |  |
Investments maturing within one year | $ 343,616,000 |  |  |  |
Supplier [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Additional investment acquired, percentage |  |  |  | 3.20% |
Ownership percentage | 12.90% |  |  |  | 10.00%
Cash consideration | $ 10,000,000 |  |  | $ 2,500,000 | $ 7,500,000
Carrying value | $ 9,529,000 |  |  |  |

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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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