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Investments and Other Assets - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 14, 2018 | Jul. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  |  | $ 32,651 |  | $ 32,651 |  | $ 27,098
Equity income (loss) in unconsolidated investments, net |  |  | 771 | $ 866 | $ 15,080 | $ (1,549) |
CareerBuilder |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment retained after disposal, ownership interest (as a percent) |  | 17.00% |  |  | 17.00% |  |
Equity method investment retained after disposal, fully diluted ownership interest (as a percent) |  | 10.00% |  |  | 10.00% |  |
Equity method investments |  |  | $ 21,600 |  | $ 21,600 |  |
Proceeds from dividends received | $ 9,900 |  |  |  |  |  |
Gain on sale of equity method investment | $ 16,800 |  |  |  |  |  |
Equity income (loss) in unconsolidated investments, net |  |  |  |  | $ 15,700 |  |

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