Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Details)

v3.7.0.1
Subsequent Events - Additional Information (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 6 Months Ended
Jul. 31, 2017
USD ($)
ft²
property
$ / shares
shares
Jul. 25, 2017
USD ($)
$ / shares
shares
Jul. 07, 2017
USD ($)
ft²
Jul. 02, 2017
USD ($)
ft²
Jul. 31, 2017
USD ($)
ft²
property
$ / shares
shares
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
property
Jul. 25, 2014
ft²
Subsequent Event [Line Items]                
Square Footage (unaudited) | ft²               81,371
Price of acquired property           $ 15,697 $ 17,000  
Number of properties acquired | property           1 1  
Subsequent event | Overnight offering                
Subsequent Event [Line Items]                
Number of shares issued (in shares) | shares   1,200            
Offering price (in dollars per share) | $ / shares   $ 20.52            
Consideration received   $ 22,700            
Subsequent event | Overallotment option                
Subsequent Event [Line Items]                
Number of shares issued (in shares) | shares 200              
Offering price (in dollars per share) | $ / shares $ 20.52       $ 20.52      
Consideration received $ 3,400              
Subsequent event | Common Stock ATM Program                
Subsequent Event [Line Items]                
Number of shares issued (in shares) | shares         600      
Consideration received         $ 11,900      
Subsequent event | Series D Preferred Stock ATM Program                
Subsequent Event [Line Items]                
Number of shares issued (in shares) | shares         60      
Consideration received         $ 1,600      
Subsequent event | Pocono. Pennsylvania                
Subsequent Event [Line Items]                
Square Footage (unaudited) | ft²       223,275        
Lease extension period       10 years        
Annualized GAAP rent       $ 600        
Subsequent event | Philadelphia, Pennsylvania                
Subsequent Event [Line Items]                
Square Footage (unaudited) | ft²     300,000          
Annualized GAAP rent     $ 1,800          
Price of acquired property     26,400          
Debt issued     $ 14,900          
Debt term     10 years 1 month 24 days          
Stated interest rate (as percent)     3.75%          
Subsequent event | Philadelphia, Pennsylvania | Philadelphia, Pennsylvania tenant                
Subsequent Event [Line Items]                
Percent occupied by tenant (as percent)     100.00%          
Subsequent event | Maitland, Florida                
Subsequent Event [Line Items]                
Square Footage (unaudited) | ft² 306,435       306,435      
Annualized GAAP rent $ 6,700              
Price of acquired property 51,400              
Debt issued $ 28,800              
Debt term 10 years              
Stated interest rate (as percent) 3.89%       3.89%      
Percent occupied by tenant (as percent) 100.00%              
Number of properties acquired | property 3       3      
Remaining term of lease 10 years 2 months 12 days              
Subsequent event | Maitland, Florida | Weighted average                
Subsequent Event [Line Items]                
Remaining term of lease 8 years 8 months 12 days              
Subsequent event | Maitland, Florida | Maitland, Florida tenant                
Subsequent Event [Line Items]                
Percent occupied by tenant (as percent) 72.00%