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Segment Reporting (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total revenues $ 311,543 $ 257,730 $ 242,099
Property operating (53,824) (41,890) (38,399)
Real estate tax expenses (43,456) (36,627) (35,285)
General and administrative expenses (6,278)    
Segment Profit 207,985    
Corporate general and administrative expenses (30,070)    
Vesting of Class B units for asset management services (24,037) 0 0
Termination of affiliate arrangements (5,454) 0 0
Depreciation and amortization (130,671) (106,095) (101,479)
Interest expense, net (45,661) (32,458) (32,390)
Acquisition expenses (530) (5,803) (5,404)
Transaction expenses (15,713) 0 0
Other income, net 2,433 5,990 248
Net (loss) income (41,718) $ 9,043 $ 13,561
Owned Real Estate      
Segment Reporting Information [Line Items]      
Total revenues 303,410    
Property operating (50,328)    
Real estate tax expenses (43,247)    
General and administrative expenses (3,403)    
Segment Profit 206,432    
Investment Management      
Segment Reporting Information [Line Items]      
Total revenues 8,133    
Property operating (3,496)    
Real estate tax expenses (209)    
General and administrative expenses (2,875)    
Segment Profit $ 1,553