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Summary of Significant Accounting Policies (Details 2)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 05, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Mar. 31, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
$ / shares
Noncontrolling Interests        
Purchase price       $ 391,056
Operating partnership units redemption ratio       1
Series A Preferred units        
Noncontrolling Interests        
Period in which units will be redeemable       1 year
Minnetonka MOB        
Noncontrolling Interests        
Cumulative preferred return 15.00%      
Equity method investment received $ 5,000      
Investor's percentage of internal rate of return 15.00%      
Minnetonka MOB | Series A Preferred units        
Noncontrolling Interests        
Number of units issued for funding purchase price | shares 44,685      
Value of units issued for funding purchase price $ 9,700      
Fair value of embedded derivative   $ 3,400   $ 3,400
Redemption value (in dollars per share) | $ / shares       $ 200
Cumulative preferred return       5.00%
Redemption share ratio exchange   1   1
Operating Partnership        
Noncontrolling Interests        
Purchase price   $ 11,300 $ 10,000  
Percentage of interest held       94.90%
Operating Partnership | Units        
Noncontrolling Interests        
Number of units issued for funding purchase price | shares   210,820 420,963  
Value of units issued for funding purchase price   $ 3,400 $ 7,300 $ 3,400