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Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued media	$ 137,975		$ 180,586
Goodwill	742,775		$ 740,955
Income tax expense (benefit)	748	$ (8,330)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	$ 981	$ (36,935)
Effective tax rate (percent)	76.30%	22.60%
Increase in income tax expense (benefit)	$ (9,078)

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