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GOODWILL AND OTHER INTANGIBLE ASSETS, INTERMEX HOLDINGS, INC., Goodwill (FY) (Details) - Intermex Holdings, Inc. and Subsidiaries [Member] - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Indefinite-Lived Intangible Assets [Abstract]            
Goodwill $ 36,259,666 $ 36,259,666 $ 36,259,666      
Total indefinite lives   36,259,666        
Trade Name [Member]            
Indefinite-Lived Intangible Assets [Abstract]            
Indefinite-lived intangible assets   $ 0        
Predecessor Company [Member]            
Indefinite-Lived Intangible Assets [Abstract]            
Goodwill     $ 0 $ 0 $ 0 $ 0
Total indefinite lives       5,300,000    
Predecessor Company [Member] | Trade Name [Member]            
Indefinite-Lived Intangible Assets [Abstract]            
Indefinite-lived intangible assets       $ 5,300,000