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Summary of Significant Accounting Policies (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounting Policies [Abstract]        
Conversion basis for common shares to OP units (in shares) 1   1  
Debt Instrument [Line Items]        
Interest expense capitalized $ 146,000 $ 103,000 $ 302,000 $ 235,000
Real estate tax capitalized 96,000 16,000 189,000 48,000
Share-based compensation 2,704,000 $ 3,042,000 7,545,000 $ 6,886,000
Anthem Marketplace Note [Member]        
Debt Instrument [Line Items]        
Face amount of debt $ 15,100,000.0   $ 15,100,000.0  
Stated interest rate 4.99%   4.99%