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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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