Assets and Liabilities Measured at Fair Value - (Narrative) (Details) - LendingTree - Derivative instrument liability	Apr. 29, 2019 $ / shares $ / item shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Variable forward contract, term	3 years
Variable forward contract (in shares) | shares	642,850
Variable forward contract, closing price (in dollars per share) | $ / shares	$ 376.35
Variable forward contract, floor price (in dollars per share)	0
Variable forward contract, cap price (in dollars per share)	254.00