Fair Value Measurements (Narrative) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate investments	$ 0	$ 7,730,000
Real estate investments
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate investments	0	$ 7,730,000
Nonrecurring | Level 3 | Real estate investments
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate investments	$ 2,352,328,000