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Summary Of Significant Accounting Policies (Supplemental Consolidated Statements Of Cash Flows Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental disclosure of cash activities:      
Cash paid for interest $ 21,359,000 $ 26,296,000 $ 27,521,000
Supplemental disclosure of non-cash activities:      
Capitalization of interest and financing costs $ 684,000 743,000 409,000
Conversion of OP Units into common stock     282,000
Mortgage loan payable assumed upon acquisition   $ (8,501,000) $ (20,462,000)