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RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]      
Reimbursement Agreements termination notice period 90 days    
Reimbursements      
Related Party Transaction [Line Items]      
Expenses related party $ 0 $ 100,000  
Receivable from related party 0    
Payable from related party     $ 300,000
Majority Shareholder | Related Party Expense, Coupon Redemptions      
Related Party Transaction [Line Items]      
Expenses related party 2,400,000 7,400,000  
Majority Shareholder | Related Party Expense, Coupon Redemption Processing      
Related Party Transaction [Line Items]      
Expenses related party 100,000 100,000  
Majority Shareholder | Related Party Expense, Other Fees      
Related Party Transaction [Line Items]      
Expenses related party $ 200,000 $ 100,000