DISCONTINUED OPERATIONS (Details) $ in Thousands				1 Months Ended			3 Months Ended			12 Months Ended
	Jun. 11, 2020 USD ($)	Jun. 21, 2019 USD ($)	Dec. 16, 2013 network_lender	Jun. 30, 2020 USD ($)	Feb. 29, 2016 defendant	Jan. 31, 2016 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)	Jul. 21, 2019 USD ($)
DISCONTINUED OPERATIONS
Assets							$ 1,188,990			$ 1,299,356	$ 1,188,990
Disposed of by means other than sale | Home Loan Center, Inc.
DISCONTINUED OPERATIONS
Loss from discontinued operations												$ 5,500
Gain on disposal										$ 0	$ 0	4,515
Recognition of a liability												$ 10,000
Disposed of by means other than sale | Loan loss obligations | Lending Tree Loans
DISCONTINUED OPERATIONS
Settlement payment								$ 36,000
Home Loan Center, Inc.
DISCONTINUED OPERATIONS
Assets														$ 11,200
Cash														$ 5,900
Dividends						$ 40,000
Pending Litigation | Disposed of by means other than sale | Loan loss obligations | Discontinued operations | Lending Tree Loans
DISCONTINUED OPERATIONS
Amount awarded to other party									$ 36,000
Residential Funding Co. v Home Loan Center | Pending Litigation
DISCONTINUED OPERATIONS
Number of loan originators | network_lender			80
Residential Funding Co. v Home Loan Center | Judicial Ruling
DISCONTINUED OPERATIONS
Amount awarded to other party		$ 68,500
Residential Funding Co. v Home Loan Center | Settled Litigation | Damages | ResCap
DISCONTINUED OPERATIONS
Amount awarded to other party				$ 58,500
Settlement payment							$ 6,400	$ 26,500
Loss contingency receivable													$ 8,600
Lehman Brothers Holdings, Inc. | Pending Litigation
DISCONTINUED OPERATIONS
Number of defendants | defendant					149
Lehman Brothers Holdings Inc. v. LendingTree, LLC
DISCONTINUED OPERATIONS
Damages sought	$ 13,300