BORROWING ARRANGEMENTS - Refinancing related costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Borrowing Activities and Arrangements [Abstract]
Write off of deferred financing costs and unamortized premiums due to refinancing		$ 10,195	$ 301
Prepayment and other costs associated with refinancing		11,770	1,812
Total debt extinguishment costs		$ 21,965	$ 2,113