Annual report pursuant to Section 13 and 15(d)

Real Estate - Additional Information (Details)

v3.10.0.1
Real Estate - Additional Information (Details)
12 Months Ended
Jan. 18, 2018
USD ($)
ft²
$ / shares
shares
Dec. 31, 2018
USD ($)
parcel
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Real Estate Properties [Line Items]        
Depreciation   $ 12,660,000 $ 10,590,000 $ 7,883,000
Number of undeveloped land parcels | parcel   6    
Impairment of investment properties   $ 0    
Impairment of land-discontinued operations   $ 3,938,000 0 0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]        
Real Estate Properties [Line Items]        
Number of undeveloped land parcels | parcel   7    
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]        
Real Estate Properties [Line Items]        
Impairment of land-discontinued operations   $ 3,938,000 $ 0 $ 0
JANAF Acquisition [Member]        
Real Estate Properties [Line Items]        
Purchase price $ 85,650,000      
VIRGINIA | JANAF Acquisition [Member]        
Real Estate Properties [Line Items]        
Purchase price $ 85,650,000      
Business acquisition share price | $ / shares $ 7.53      
Area of real estate property | ft² 810,137      
Property acquired, percentage of occupancy 94.00%      
Common Stock | VIRGINIA | JANAF Acquisition [Member]        
Real Estate Properties [Line Items]        
Common shares issued in acquisition (in shares) | shares 150,000