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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Note receivable | $ 9,818 | $ 9,974
Investments |  |
Assets |  |
Assets | 5,453,126 | 5,228,520
Fair Value, Measurements, Recurring |  |
Assets |  |
Note receivable | 9,818 | 9,974
Liabilities |  |
Options sold | 1,928 | 1,955
Notes payable | 560,618 | 557,710
Fair Value, Measurements, Recurring | Unsecured debt |  |
Liabilities |  |
Notes payable | 360,611 | 357,765
Fair Value, Measurements, Recurring | Options sold |  |
Liabilities |  |
Options sold | $ 1,928 | $ 1,955

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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