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Supplemental Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Accrued media | $ 163,777 |  | $ 163,777 |  | $ 180,586
Goodwill | 740,955 |  | 740,955 |  |
Income tax expense (benefit) | 3,457 | $ 2,986 | 6,292 | $ (3,367) |
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates | $ 8,907 | $ (10,981) | $ 19,102 | $ (39,960) |
Effective tax rate (percent) |  |  | 38.80% | 27.20% |

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