Summary of Significant Accounting Policies (Supplemental Consolidated Statements of Cash Flows Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental disclosure of cash activities:
Cash paid for interest	$ 14,344,000	$ 20,219,000	$ 23,208,000
Supplemental disclosure of non-cash activities:
Capitalization of interest and financing costs	1,035,000	3,399,000	2,674,000
Buildings and improvements included in accounts payable and accrued liabilities	(4,062,000)	$ 871,000	2,976,000
Recognition of right-of-use assets and related lease liabilities			$ 703,000
Payoff of mortgages through mortgage assumptions	$ 157,925,000