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Number Of Related Party Debt Instruments

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Related Party Transaction, Services Agreement, Automatic Renewal Periods

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Related Party Transaction, Term of Agreement

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Stock Received During Period, Shares, Related Party Employee Matters Agreement

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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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 - NARRATIVE (Details) - IAC $ in Thousands, £ in Millions, shares in Millions			12 Months Ended
	Oct. 14, 2016 USD ($)	Aug. 29, 2013 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 GBP (£) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 29, 2017 USD ($) intercompany_note	Mar. 20, 2017 USD ($) subsidiary	Mar. 20, 2017 GBP (£) subsidiary	Feb. 07, 2017 GBP (£)
Related Party Transaction [Line Items]
Allocated general and administrative costs from related party activities			$ 4,789		$ 4,247	$ 2,598
Long-term debt - related party			2,813		49,838
Notes Payable \| Promissory note due October 14, 2023
Related Party Transaction [Line Items]
Long-term debt - related party	$ 42,000		0		42,000
Proceeds from related party debt	$ 11,400
Long-term debt, interest rate	11.00%
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
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
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%
Notes Payable \| Promissory note due August 29, 2018
Related Party Transaction [Line Items]
Long-term debt - related party		$ 5,000	0		$ 5,000
Basis spread on variable rate		2.00%
Notes Payable \| Promissory Note Due December 31, 2020
Related Party Transaction [Line Items]
Increase (decrease) in long-term debt - related parties			$ (2,800)	£ (2.4)
Intercompany Notes
Related Party Transaction [Line Items]
Number of related party debt instruments \| intercompany_note							2
Payoff Intercompany Note
Related Party Transaction [Line Items]
Current notes receivable, related parties							$ 61,500
Working Capital Intercompany Note
Related Party Transaction [Line Items]
Current notes receivable, related parties							$ 15,000
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
Payments received from related parties			$ 1,700
Amounts due to related party			$ 400
Employee Matters Agreement
Related Party Transaction [Line Items]
Voting interest (as a percent)			80.00%
Shares received from related party pursuant to employee matters agreement (in shares) \| shares			0.4	0.4
Transaction Related Costs
Related Party Transaction [Line Items]
Amounts due to related party			$ 2,000