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Supplemental Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 02, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share Capital [Line Items]
Asset Impairment Charges		$ 14,926	$ 0	$ 14,926	$ 0
Income tax expense		5,183	2,618	9,205	3,211
Income before income taxes and equity in earnings of non-consolidated affiliates		$ 13,182	$ 24,075	$ 40,466	$ 41,964
Effective tax rate (percent)		39.30%	10.90%	22.70%	7.70%
Share-based Payment Arrangement, Expense		$ 53,465		$ 53,465
Targeted Victory
Share Capital [Line Items]
Sale of Stock, Percentage of Ownership after Transaction	13.30%
Code and Theory
Share Capital [Line Items]
Sale of Stock, Percentage of Ownership after Transaction	8.50%
Observatory
Share Capital [Line Items]
Sale of Stock, Percentage of Ownership after Transaction	8.10%
SMG Units
Share Capital [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	12,131
Share-based Payment Arrangement, Expense		$ 45,986
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	6,661
RSUs outstanding (shares)	5,470
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 months

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