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Summary of Significant Accounting Policies (Supplemental Consolidated Statements of Cash Flows Information) (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Supplemental disclosure of cash activities:    
Cash paid for interest $ 15,467,000 $ 17,621,000
Supplemental disclosure of non-cash activities:    
Capitalization of interest and financing costs 2,449,000 1,865,000
Buildings and improvements included in accounts payable and accrued liabilities $ (654,000)  
Recognition of right-of-use assets and related lease liabilities   $ 703,000