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DEBT - Schedule of future payments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total payments $ 370,461 $ 444,197
Mortgages    
Debt Instrument [Line Items]    
2019 (remainder) 10,896  
2020 42,093  
2021 97,137  
2022 40,741  
2023 48,359  
Thereafter 277,725  
Total payments $ 516,951