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Condensed Consolidated Balance Sheets Unaudited (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	[1]
Current Assets:
Allowance for doubtful accounts	$ 9,106	$ 9,464
Class A Non-Voting
Shareholders' Investment:
Par or stated value per share (USD per share)	$ 1.00	$ 1.00
Shares authorized (shares)	50,000,000	50,000,000
Shares issued (shares)	30,850,000	30,847,000
Shares outstanding (shares)	30,850,000	30,847,000
Class B Voting
Shareholders' Investment:
Par or stated value per share (USD per share)	$ 1.00	$ 1.00
Shares authorized (shares)	50,000,000	50,000,000
Shares issued (shares)	22,451,000	22,510,000
Shares outstanding (shares)	22,451,000	22,510,000
[1] Derived from the audited Consolidated Balance Sheet

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