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ACCRUED AND OTHER LIABILITIES, INTERMEX HOLDINGS, INC. (FY) (Details) - Intermex Holdings, Inc. and Subsidiaries [Member] - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities and Other Liabilities [Abstract]      
Payables to agents $ 8,230,526 $ 6,875,416  
Compensation accruals 1,572,609 1,092,460  
Accruals for taxes 840,289 318,792  
Accrued interest   0  
Other   3,227,781  
Accrued and other liabilities $ 16,656,126 $ 11,514,449  
Predecessor [Member]      
Accrued Liabilities and Other Liabilities [Abstract]      
Payables to agents     $ 4,879,360
Compensation accruals     870,856
Accruals for taxes     163,843
Accrued interest     676,806
Other     3,296,070
Accrued and other liabilities     $ 9,886,935