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Consolidated Statements of Shareholders' Investment (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Net income (loss) attributable to redeemable noncontrolling interest	$ 2,258	$ 3,191	$ 1,275
Class A Non-Voting
Class Of Stock [Line Items]
Cash dividends paid (in dollars per share)	$ 0.19	$ 0.28	$ 0.28
Class B Voting
Class Of Stock [Line Items]
Cash dividends paid (in dollars per share)	$ 0.17	$ 0.20	$ 0.20

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Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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