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Revenues - Contract Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Contract Assets Activity [Roll Forward]    
Balance at beginning of period $ 289  
Tenant openings (139)  
Executed leases 25  
Balance at end of period 175  
Change in Contract with Customer, Liability [Roll Forward]    
Contract liability 265  
Completed performance obligation (4)  
Contract obligation 0  
Contract liability 261  
Contract with Customer, Asset, Net [Abstract]    
Contract assets 289 $ 175
Expected Settlement Period    
2019   (167)
2020   (3)
2021   (1)
2022   0
2023   (4)
Contract with Customer, Liability [Abstract]    
Contract liability $ 265 261
Expected Settlement Period    
2019   (99)
2020   (54)
2021   (54)
2022   $ (54)
Lease commission recognized upon tenant opening (as a percent) 50.00%