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Annual report pursuant to Section 13 and 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Summary of Carrying Amount and Percentage Ownership of Significant Investments in Affiliates) (Details)

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Investments In Affiliates Accounted For Using The Equity Method (Summary of Carrying Amount and Percentage Ownership of Significant Investments in Affiliates) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Carrying amount $ 309,000 Ìý $ 581,000
LendingTree Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Equity method investment additional shares purchased 450 Ìý Ìý
QVC Group Common Stock Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Carrying amount $ 40,000 Ìý 224,000
QVC Group Common Stock | HSNi Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Percentage ownership 100.00% Ìý Ìý
Carrying amount Ìý Ìý 184,000
QVC Group Common Stock | Other Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Carrying amount $ 40,000 Ìý 40,000
Liberty Ventures common stock Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Carrying amount 269,000 Ìý 357,000
Equity Method Investment Other Than Temporary Impairment Ìý $ 98,000 Ìý
Liberty Ventures common stock | Other Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Carrying amount $ 81,000 Ìý 110,000
Liberty Ventures common stock | FTD Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Percentage ownership 37.00% Ìý Ìý
Market value $ 73,000 Ìý Ìý
Carrying amount $ 73,000 Ìý 216,000
Liberty Ventures common stock | LendingTree Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý
Percentage ownership 27.00% Ìý Ìý
Market value $ 1,098,000 Ìý Ìý
Carrying amount $ 115,000 Ìý $ 31,000