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DEBT - Schedule of future payments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total payments $ 430,950 $ 444,197
Mortgages    
Debt Instrument [Line Items]    
2019 25,926  
2020 76,873  
2021 104,547  
2022 40,917  
2023 48,546  
Thereafter 280,778  
Total payments $ 577,587