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Non-controlling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May. 13, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Sep. 30, 2012
Noncontrolling Interest [Line Items]              
Distributions to non-controlling interest holders       $ 1,361      
163 Washington Ave Condominiums              
Noncontrolling Interest [Line Items]              
Noncontrolling members' aggregate investment             $ 500
Advisor              
Noncontrolling Interest [Line Items]              
Distributions to non-controlling interest holders   $ 800 $ 100 $ 1,400 $ 100    
OP units | Advisor              
Noncontrolling Interest [Line Items]              
Nonvested Shares outstanding (in shares)   4,178,090   4,178,090   4,270,841  
LTIP units | Advisor              
Noncontrolling Interest [Line Items]              
Nonvested Shares outstanding (in shares)   8,880,579   8,880,579   8,880,579  
Common stock              
Noncontrolling Interest [Line Items]              
OP units converted to common stock (in shares) 92,751