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Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements - Discontinued Operations, Revenue Recognition, Accounts Receivable (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements      
Number of investment properties classified as held for sale, reported as discontinued operations | item 15    
Amount of debt assumed by buyers of investment properties, or repaid as a result of investment property sales $ 0    
Income from discontinued operations      
Income from discontinued operations     $ 2,800,000
Per common share, basic and diluted (in dollars per share) | $ / shares     $ 0.01
Revenue Recognition and Accounts Receivable      
Allowance for Doubtful Accounts Receivable 74,000 $ 429,000  
Other Real Estate Revenue $ 2,655,000 $ 4,405,000 $ 2,930,000