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RELATED PARTY TRANSACTIONS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Inteliquent, Inc [Member]          
Related Party Transaction [Line Items]          
Due from related parties $ 0.6   $ 0.6   $ 0.5
Dan Caruso [Member] | Aircraft Reimbursement [Member]          
Related Party Transaction [Line Items]          
Payable to related party settled $ 0.2 $ 0.2 $ 0.3 $ 0.4