SUBSEQUENT EVENTS - Narrative (Details) - Senior Notes - USD ($) $ in Millions		1 Months Ended
	Dec. 04, 2017	Jan. 31, 2019
Subsequent events
Amendment fee	$ 3.0
Subsequent Event
Subsequent events
Amendment fee		$ 3.2
Period One
Subsequent events
Prepayment premium	4.00%
Period One | Subsequent Event
Subsequent events
Prepayment premium		3.00%
Period Two
Subsequent events
Prepayment premium	0.00%
Period Two | Subsequent Event
Subsequent events
Prepayment premium		1.00%