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Real Estate Properties - Schedule of MOB Acquisitions (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
ft²
property
Jan. 31, 2018
USD ($)
ft²
property
Dec. 31, 2017
USD ($)
ft²
building
property
Nov. 30, 2017
USD ($)
ft²
property
Oct. 31, 2017
USD ($)
ft²
property
Jul. 31, 2017
USD ($)
ft²
property
Jan. 31, 2017
USD ($)
ft²
property
Oct. 31, 2016
USD ($)
ft²
property
May 31, 2016
USD ($)
ft²
property
Feb. 29, 2016
USD ($)
ft²
property
Dec. 31, 2018
USD ($)
ft²
building
property
Dec. 31, 2017
USD ($)
ft²
building
property
Dec. 31, 2016
USD ($)
ft²
building
property
Real Estate [Line Items]                          
Number of Buildings | building                     469    
Square Feet | ft²                     812    
Real Estate Investment Property, Net     $ 6,370,286               $ 6,341,908 $ 6,370,286  
Acquired Real Estate Leases     791,067               691,219 791,067  
Acquired Real Estate Lease Obligations     $ (136,713)               (134,395) (136,713)  
Assumed Debt                     $ (44,386) $ 0 $ 0
MOBs                          
Real Estate [Line Items]                          
Number of Properties | property                     13   2
MOBs | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property                     4 6 3
Number of Buildings | building     6               4 6 5
Square Feet | ft²     630               535 630 390
Purchase price, including closing costs                     $ 114,973 $ 113,168  
Cash Paid plus Assumed Debt                         $ 86,432
Acquired Real Estate Leases     $ 27,713               29,527 27,713 9,645
Acquired Real Estate Lease Obligations     $ (20)               0 (20) (1,091)
Assumed Debt                     $ (11,050) $ 0 $ 0
MOBs | 3 States | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property   3                      
Number of Buildings | building                     3    
Square Feet | ft²   400                      
Purchase price, including closing costs   $ 91,698                      
Acquired Real Estate Leases   20,220                      
Acquired Real Estate Lease Obligations   0                      
Assumed Debt   0                      
MOBs | Virginia | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property 1   1                    
Number of Buildings | building     1               1 1  
Square Feet | ft² 135   136                 136  
Purchase price, including closing costs $ 23,275   $ 15,844                    
Acquired Real Estate Leases 9,307   4,986                 $ 4,986  
Acquired Real Estate Lease Obligations 0   (20)                 $ (20)  
Assumed Debt (11,050)   $ 0                    
MOBs | Kansas | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property             1            
Number of Buildings | building     1                 1  
Square Feet | ft²             117            
Purchase price, including closing costs             $ 15,106            
Acquired Real Estate Leases             6,338            
Acquired Real Estate Lease Obligations             0            
Assumed Debt             0            
MOBs | Maryland | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property           1              
Number of Buildings | building     1                 1  
Square Feet | ft²           59              
Purchase price, including closing costs           $ 16,601              
Acquired Real Estate Leases           3,937              
Acquired Real Estate Lease Obligations           0              
Assumed Debt           0              
MOBs | 2 States | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property         2                
Number of Buildings | building     2                 2  
Square Feet | ft²         255                
Purchase price, including closing costs         $ 38,794                
Acquired Real Estate Leases         7,016                
Acquired Real Estate Lease Obligations         0                
Assumed Debt         0                
MOBs | California | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property       1                  
Number of Buildings | building     1                 1  
Square Feet | ft²       63                  
Purchase price, including closing costs       $ 26,823                  
Acquired Real Estate Leases       5,436                  
Acquired Real Estate Lease Obligations       0                  
Assumed Debt       0                  
MOBs | Minnesota | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property                   1      
Number of Buildings | building                         3
Square Feet | ft²                   128      
Cash Paid plus Assumed Debt                   $ 22,700      
Acquired Real Estate Leases                   5,053      
Acquired Real Estate Lease Obligations                   (1,091)      
Assumed Debt                   0      
MOBs | Florida | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property                 1        
Number of Buildings | building                         1
Square Feet | ft²                 166        
Purchase price, including closing costs                 $ 45,232        
Acquired Real Estate Leases                 0        
Acquired Real Estate Lease Obligations                 0        
Assumed Debt                 0        
MOBs | Ohio | Acquisitions                          
Real Estate [Line Items]                          
Number of Properties | property               1          
Number of Buildings | building                         1
Square Feet | ft²               96          
Cash Paid plus Assumed Debt               $ 18,500          
Acquired Real Estate Leases               4,592          
Acquired Real Estate Lease Obligations               0          
Assumed Debt               0          
Land                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net     $ 824,879               $ 844,567 $ 824,879  
Land | MOBs | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net     25,618               19,736 25,618 $ 7,845
Land | MOBs | 3 States | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net   16,873                      
Land | MOBs | Virginia | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net 2,863   3,263                 3,263  
Land | MOBs | Kansas | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net             1,522            
Land | MOBs | Maryland | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net           6,138              
Land | MOBs | 2 States | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net         6,738                
Land | MOBs | California | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net       7,957                  
Land | MOBs | Minnesota | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net                   4,028      
Land | MOBs | Florida | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net                 2,792        
Land | MOBs | Ohio | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net               1,025          
Buildings and Improvements                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net     6,999,884               7,031,733 6,999,884  
Buildings and Improvements | MOBs | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net     59,857               $ 65,710 59,857 $ 70,033
Buildings and Improvements | MOBs | 3 States | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net   $ 54,605                      
Buildings and Improvements | MOBs | Virginia | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net $ 11,105   $ 7,615                 $ 7,615  
Buildings and Improvements | MOBs | Kansas | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net             $ 7,246            
Buildings and Improvements | MOBs | Maryland | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net           $ 6,526              
Buildings and Improvements | MOBs | 2 States | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net         $ 25,040                
Buildings and Improvements | MOBs | California | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net       $ 13,430                  
Buildings and Improvements | MOBs | Minnesota | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net                   $ 14,710      
Buildings and Improvements | MOBs | Florida | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net                 $ 42,440        
Buildings and Improvements | MOBs | Ohio | Acquisitions                          
Real Estate [Line Items]                          
Real Estate Investment Property, Net               $ 12,883