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Investments Other Investments (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 21, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | $ (3,955) | $ (1,594) | $ (5,100) | $ (7,301)
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments |  | 7,624 | 0 | 7,624 | 0
Upserve [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Disposition of Investment, Gross Consideration Received |  |  |  | 16,000 |
Noncash or Part Noncash Divestiture, Amount of Consideration Received |  |  |  | 1,300 |
Proceeds from Sale of Other Investments |  |  |  | 14,700 |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  | (7,600) |
Groupon Israel [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received |  |  |  | 2,300 |
Noncash or Part Noncash Acquisition, Investments Acquired | $ 400 |  |  |  |
Monster LP [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | $ 3,800 | $ 2,300 | $ 1,500 | $ 900

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