Summary of Significant Accounting Policies (Supplemental Consolidated Statements of Cash Flows Information) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Supplemental disclosure of cash activities:
Cash paid for interest	$ 17,621,000	$ 17,907,000
Supplemental disclosure of non-cash activities:
Capitalization of interest and financing costs	1,865,000	1,187,000
Recognition of right-of-use assets and related lease liabilities	$ 703,000	$ 13,992,000