Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Details)

v3.10.0.1
Subsequent Events - Additional Information (Details)
$ in Thousands
 2 Months Ended 12 Months Ended
Feb. 08, 2019
USD ($)
tenant
Jan. 31, 2019
USD ($)
Dec. 27, 2018
USD ($)
Oct. 27, 2017
Jul. 31, 2017
USD ($)
Jul. 07, 2017
USD ($)
Feb. 13, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 11, 2019
USD ($)
Subsequent Event [Line Items]                      
Gain on sale of real estate, net               $ 2,763 $ 3,993 $ 242  
Purchase price               $ 63,245 $ 132,157    
Maitland, Florida                      
Subsequent Event [Line Items]                      
Purchase price         $ 51,600            
Lease Term         8 years 7 months 6 days            
Debt issued or assumed         $ 28,800            
Stated interest rate (as a percent)         3.89%            
Maitland, Florida | Subsequent event                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of property   $ 6,900                  
Gain on sale of real estate, net   $ 3,000                  
Philadelphia, Pennsylvania                      
Subsequent Event [Line Items]                      
Purchase price           $ 27,100          
Lease Term           15 years 4 months 24 days          
Debt issued or assumed           $ 14,900          
Stated interest rate (as a percent)           3.75%          
Philadelphia, Pennsylvania | Subsequent event                      
Subsequent Event [Line Items]                      
Purchase price $ 2,700                    
Number of tenants | tenant 1                    
Lease Term 15 years                    
Lake Mary, Florida                      
Subsequent Event [Line Items]                      
Purchase price     $ 18,700                
Lease Term     11 years                
Lake Mary, Florida | Subsequent event                      
Subsequent Event [Line Items]                      
Debt issued or assumed $ 10,600                    
Fixed rate mortgage loans                      
Subsequent Event [Line Items]                      
Stated interest rate (as a percent)               5.75%      
Fixed rate mortgage loans | Lake Mary, Florida | Subsequent event                      
Subsequent Event [Line Items]                      
Stated interest rate (as a percent) 4.70%                    
Debt instrument term 7 years                    
Fixed rate mortgage loans debt extended                      
Subsequent Event [Line Items]                      
Debt instrument term               3 years      
Fixed rate mortgage loans debt extended | Lake Mary, Florida | Subsequent event                      
Subsequent Event [Line Items]                      
Debt instrument term 3 years                    
LIBOR                      
Subsequent Event [Line Items]                      
Spread on LIBOR (as percent)       2.75%              
LIBOR | Fixed rate mortgage loans | Lake Mary, Florida | Subsequent event                      
Subsequent Event [Line Items]                      
Spread on LIBOR (as percent) 1.80%                    
LIBOR | Variable rate mortgage loans | Lake Mary, Florida | Subsequent event                      
Subsequent Event [Line Items]                      
Spread on LIBOR (as percent) 1.80%                    
2019 Universal Shelf | Subsequent event                      
Subsequent Event [Line Items]                      
Universal registration statement, amount authorized                     $ 500,000
Series A and B Preferred Stock ATM Programs | Series A and B Preferred Stock | Subsequent event                      
Subsequent Event [Line Items]                      
Number of shares sold (in shares) | shares             0        
Cantor Fitzgerald & Co | Series D Preferred Stock ATM Program | Series D Preferred Stock                      
Subsequent Event [Line Items]                      
Net proceeds from sale of shares               $ 2,200      
Number of shares sold (in shares) | shares               100,000      
Cantor Fitzgerald & Co | Series D Preferred Stock ATM Program | Series D Preferred Stock | Subsequent event                      
Subsequent Event [Line Items]                      
Number of shares sold (in shares) | shares             0        
Cantor Fitzgerald & Co | Common Stock | Common Stock ATM Program                      
Subsequent Event [Line Items]                      
Net proceeds from sale of shares               $ 16,100      
Number of shares sold (in shares) | shares               800,000      
Cantor Fitzgerald & Co | Common Stock | Common Stock ATM Program | Subsequent event                      
Subsequent Event [Line Items]                      
Net proceeds from sale of shares             $ 3,400        
Number of shares sold (in shares) | shares             179,785