Fair Value Measurements (Narrative) (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2020 USD ($) investment	Dec. 31, 2019 USD ($) investment
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate fund investments	$ 45,129,000	$ 222,649,000
Real estate fund investments
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Number of investments held by fund (investment) \| investment	4	4
Real estate fund investments	$ 45,129,000	$ 222,649,000
Excess of fair value over cost	296,435,000
Level 3 \| Real estate fund investments
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate fund investments	45,129,000
Excess of fair value over cost	296,435,000
Nonrecurring \| Real estate assets
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate asset	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The amount of excess fair value of investments over it's cost.

+ References

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- Definition

Number Of Investments Held By Fund during the year.

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- Definition

This element represents the real estate assets related to the fund

+ References

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