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LEASES - Future Rental Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Receivable [Abstract]      
2019 $ 256,598    
2020 235,652    
2021 216,247    
2022 198,449    
2023 176,282    
Thereafter 986,865    
Additional rent based on percentage of tenants' sales or reimbursements 2,000 $ 1,200 $ 800
Tenant Expense Reimbursements      
Capital Leased Assets [Line Items]      
Revenues $ 108,700 $ 99,100 $ 84,900