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Investments and Other Assets - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 18, 2017 | Jul. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity income (loss) in unconsolidated investments, net |  |  | $ 866 |  | $ (1,198) | $ (1,549) | $ (2,763) |
Proceeds from sale of available-for-sale securities |  |  | 14,600 |  |  | 14,600 |  |
Realized losses on sale of available-for-sale securities |  |  | 400 |  |  | 3,900 |  |
Impairment of equity method investments |  |  |  | $ 5,800 |  | 5,800 |  |
CareerBuilder |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment retained after disposal, ownership interest (as a percent) |  | 17.00% |  |  |  |  |  |
Equity method investment retained after disposal, fully diluted ownership interest (as a percent) |  | 12.00% |  |  |  |  |  |
Equity income (loss) in unconsolidated investments, net |  |  | 500 |  |  |  |  |
Subsequent Event | Livestream |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 21,400 |  |  |  |  |  |  |
Other long term assets |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |
Cost method investments |  |  | $ 15,300 |  |  | $ 15,300 |  | $ 14,800

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