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Fair Value of Financial Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 06, 2020 | Dec. 31, 2019
Investment maturity term |  |  | 1 year |  |  |
Unrealized holding gain | $ 402,000 |  | $ 402,000 |  |  |
Fair value of investments | 342,819,000 |  | 342,819,000 |  |  |
Impairment charge, Held-to-maturity Securities | 0 | $ 0 | 0 | $ 0 |  |
Fair value of investments in rabbi trust | $ 14,774,000 |  | $ 14,774,000 |  |  | $ 12,811,000
Maximum [Member] |  |  |  |  |  |
Investment maturity term |  |  | 15 months |  |  |
Supplier [Member] |  |  |  |  |  |
Ownership percentage | 12.90% |  | 12.90% |  | 3.20% |
Cash consideration | $ 10,000,000 |  | $ 10,000,000 |  | $ 2,500,000 |
Carrying value | $ 9,816,000 |  | $ 9,816,000 |  |  |

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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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