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GOODWILL AND INTANGIBLE - Customer Lists Valuation (Details) - Customer lists
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Valuation  
Customer lists value, before amortization $ 10.5
Useful life of finite-lived intangible assets 9 years
Fair value inputs  
Attrition rate (as a percent) 24.00%
Discount rate (as a percent) 12.00%