RESTRICTED CASH (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 4,091	$ 4,089
Decrease in restricted cash	2	(2,452)	$ (12,175)
Other
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	57	57
Lending Tree Loans | Discover Bank | Cash in escrow from sale of LendingTree Loans
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 4,034	$ 4,032