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Supplemental Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued media	$ 213,915,000		$ 216,931,000
Goodwill	725,390,000		$ 740,674,000
Indefinite-lived intangible assets acquired	$ 14,600
Finite-lived intangible assets, remaining amortization period	5 years
Income tax expense	$ 13,500,000	$ 748,000
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	$ 15,294,000	$ 981,000
Effective tax rate (percent)	76.20%	88.26991%

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