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RESTRUCTURING EXPENSE (Details) (Continuing Lease Obligations, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Continuing Lease Obligations
 
Changes in restructuring expenses  
December 31, 2014 $ 178us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= tree_ContinuousLeaseObligationsMember
Restructuring expense 2us-gaap_BusinessExitCosts1
/ us-gaap_RestructuringCostAndReserveAxis
= tree_ContinuousLeaseObligationsMember
Payments (77)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= tree_ContinuousLeaseObligationsMember
March 31, 2015 $ 103us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= tree_ContinuousLeaseObligationsMember