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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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The increase (decrease) during the reporting period in the amount owed by the reporting entry in the form of loans and obligations (generally evidenced by promissory notes) made by the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The amount for notes payable (written promise to pay), due to related parties.

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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RELATED PARTY TRANSACTIONS WITH IAC - Narrative (Details) shares in Thousands, $ in Thousands, € in Millions, £ in Millions			3 Months Ended	12 Months Ended
	Oct. 14, 2016 USD ($)	Aug. 29, 2013 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2018 EUR (€) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Sep. 29, 2017 USD ($) intercompany_note	Mar. 20, 2017 USD ($) subsidiary	Mar. 20, 2017 GBP (£) subsidiary	Feb. 07, 2017 GBP (£)
Class B Common Stock
Related Party Transaction [Line Items]
Common stock issued (shares) \| shares			415,186	421,118		415,186
Services Agreement
Related Party Transaction [Line Items]
Term of related party agreement				1 year	1 year
Automatic renewal periods for related party agreement				1 year	1 year
Employee Matters Agreement
Related Party Transaction [Line Items]
Voting interest (as a percent)				80.00%
IAC
Related Party Transaction [Line Items]
Allocated general and administrative costs from related party activities						$ 4,789		$ 4,247
Long-term debt - related party			$ 2,813	$ 1,015		2,813
IAC \| Notes Payable \| Promissory note due October 14, 2023
Related Party Transaction [Line Items]
Long-term debt - related party	$ 42,000
Proceeds from related party debt	$ 11,400
Long-term debt, interest rate	11.00%
IAC \| Notes Payable \| Promissory Note Due March 20, 2024 (Note A)
Related Party Transaction [Line Items]
Long-term debt - related party \| £											£ 21.0
Long-term debt, interest rate										6.50%	6.50%
Number of foreign subsidiaries of related party issued long-term debt \| subsidiary										2	2
IAC \| Notes Payable \| Promissory Note Due March 20, 2047 (Note B)
Related Party Transaction [Line Items]
Long-term debt - related party										$ 15,500
Long-term debt, interest rate										7.00%	7.00%
Number of foreign subsidiaries of related party issued long-term debt \| subsidiary										2	2
IAC \| Notes Payable \| Promissory Note Due February 7, 2024
Related Party Transaction [Line Items]
Long-term debt - related party \| £												£ 8.4
Long-term debt, interest rate												6.875%
IAC \| Notes Payable \| Promissory note due August 29, 2018
Related Party Transaction [Line Items]
Long-term debt - related party		$ 5,000
Basis spread on variable rate		2.00%
IAC \| Notes Payable \| Promissory Note Due December 31, 2020
Related Party Transaction [Line Items]
Increase (decrease) in long-term debt - related parties				(1,000)	€ (0.9)	(2,800)	€ (2.4)
IAC \| Services Agreement
Related Party Transaction [Line Items]
Payments received from related parties			1,700	5,700
Amounts due from related party				100
Amounts due to related party			400			400
IAC \| Transaction Related Costs
Related Party Transaction [Line Items]
Amounts due to related party			$ 2,000			$ 2,000
IAC \| Tax Sharing Agreement
Related Party Transaction [Line Items]
Taxes payable				$ 12,100
IAC \| Employee Matters Agreement
Related Party Transaction [Line Items]
Shares received from related party pursuant to employee matters agreement (in shares) \| shares			400	900	900
IAC \| Intercompany Notes
Related Party Transaction [Line Items]
Number of related party debt instruments \| intercompany_note									2
IAC \| Payoff Intercompany Note
Related Party Transaction [Line Items]
Current notes receivable, related parties									$ 61,500
IAC \| Working Capital Intercompany Note
Related Party Transaction [Line Items]
Current notes receivable, related parties									$ 15,000