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DEBT - Schedule of Required Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 30, 2018
Apr. 30, 2017
Debt Instrument [Line Items]      
Total payments $ 444,197 $ 509,919 $ 565,978
Mortgages And Term Loans      
Debt Instrument [Line Items]      
2019 28,587    
2020 87,592    
2021 104,553    
2022 40,917    
2023 48,546    
Thereafter 280,779    
Total payments $ 590,974