Summary of Significant Accounting Policies (Supplemental Consolidated Statements of Cash Flows Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Supplemental disclosure of cash activities:
Cash paid for interest	$ 4,660,000	$ 5,271,000
Supplemental disclosure of non-cash activities:
Capitalization of interest and financing costs	715,000	799,000
Buildings and improvements included in accounts payable and accrued liabilities	$ 2,692,000	$ 644,000