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LEASE OBLIGATIONS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Leases [Abstract]        
Operating lease expense $ 1.8 $ 2.2 $ 5.3 $ 6.8