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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Board of Directors Chairmen [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties $ 0.1 $ 0.1 $ 0.1 $ 0.1  
Accounts receivable from related parties (less than) 0.1   0.1   $ 0.1
InteliStaf [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties $ 6.3 5.4 $ 18.2 14.5  
Joint venture, percent ownership 68.00%   68.00%    
Receivable balance with joint venture $ 2.9   $ 2.9   2.8
Payable balance with joint venture $ 0.4   $ 0.4   $ 0.3
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Rent expense   $ 0.1   $ 0.3