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Fair Value Measurements (Summarized Information About Level 3 Fair Value Measurements) (Details) - Level 3 - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Convertible Preferred Securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, fair value measurement with unobservable input | $ 7,154 | $ 7,388 | $ 3,294
Convertible Preferred Securities | Implied based on market prices |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, fair value measurement with unobservable input | $ 7,154 | 7,388 |
Real Property | Third-Party Appraisal |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, fair value measurement with unobservable input |  | $ 29,347 |

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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