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Summary of Significant Accounting Policies - Noncontrolling Interests (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 12, 2017
USD ($)
Dec. 17, 2015
USD ($)
shares
Mar. 01, 2015
USD ($)
Feb. 05, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
properties
shares
Dec. 31, 2016
USD ($)
properties
shares
Apr. 01, 2016
USD ($)
Business Acquisition [Line Items]              
Value of units issued for funding purchase price         $ 0 $ 20,980  
Acquisition price         $ 1,414,179 $ 1,285,185  
Percentage of interest held         97.10% 97.50%  
Conversion ratio         1    
Embedded derivative $ 5,600       $ 0 $ 5,571  
Aggregate purchase price         1,370,000 1,270,000  
Equity investment     $ 5,000        
Internal rate of return     15.00%        
Redeemable noncontrolling interest, equity, redemption value         1,100    
Operating Partnership              
Business Acquisition [Line Items]              
Acquisition price         $ 78,600 $ 8,500  
Units | Operating Partnership              
Business Acquisition [Line Items]              
Number of real estate properties acquired | properties         1 1  
Number of units issued for funding purchase price (in shares) | shares         2,247,817 174,085  
Value of units issued for funding purchase price         $ 44,300 $ 2,900  
Noncontrolling interest, decrease from redemptions or purchase of interests         $ 700 $ 4,000  
Series A Preferred units              
Business Acquisition [Line Items]              
Cumulative preferred return       5.00%      
Shares issued upon conversion       1      
Redemption value per share | $ / shares       $ 200      
Period of time before redeemable       1 year      
Joint venture, Operating Partnership and Medical Center of New Albany I, LLC [Member] | Units | Operating Partnership              
Business Acquisition [Line Items]              
Number of shares (in shares) | shares         38,641 217,549  
Park Nicollet Clinic              
Business Acquisition [Line Items]              
Number of units issued for funding purchase price (in shares) | shares       44,685      
Value of preferred units       $ 9,700      
Internal rate of return     15.00%        
Park Nicollet Clinic | Units              
Business Acquisition [Line Items]              
Business acquisition, equity interest redeemed, value assigned             $ 9,800
Embedded derivative             $ 2,700
HonorHealth - Scottsdale MOB              
Business Acquisition [Line Items]              
Number of units issued for funding purchase price (in shares) | shares   91,236          
Value of preferred units   $ 19,700          
Aggregate purchase price $ 20,000