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Summary of Significant Accounting Policies (Supplemental Consolidated Statements of Cash Flows Information) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental disclosure of cash activities:      
Cash paid for interest $ 23,859,000 $ 22,191,000 $ 21,359,000
Supplemental disclosure of non-cash activities:      
Capitalization of interest and financing costs 1,649,000 1,528,000 $ 684,000
Recognition of right-of-use assets and related lease liabilities $ 13,778,000    
Issuance of OP Units in connection with a land parcel acquisition   $ 975,000