Fair Value Measurements (Narrative) (Details) $ in Thousands			9 Months Ended
	Sep. 30, 2022 USD ($) investment	Dec. 31, 2021 USD ($) investment	Sep. 30, 2022 USD ($) investment
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	$ 930	$ 7,730	$ 930
Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	$ 930	$ 7,730	$ 930
Real estate fund investments
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Number of investments held by fund (investment) | investment	2	3	2
Real estate fund investments	$ 930	$ 7,730	$ 930
Fair value below cost	275,459		275,459
Level 3 | Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	930	$ 7,730	930
Fair value below cost	$ 275,459		$ 275,459