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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Oct. 01, 2018
Accounting Standards Update 2014-09    
Disaggregation of Revenue [Line Items]    
Cumulative effect of new accounting principle in period of adoption   $ 1,502
Refund Transfer Fees    
Disaggregation of Revenue [Line Items]    
Accounts receivable, before allowance for credit loss $ 0  
Retained Earnings | Accounting Standards Update 2014-09    
Disaggregation of Revenue [Line Items]    
Cumulative effect of new accounting principle in period of adoption   $ 1,502