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Condensed Consolidated Balance Sheets Unaudited (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | [1]
--- | --- | --- | ---
Current Assets: |  |
Allowance for doubtful accounts | $ 9,476 | $ 9,348
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) | 30,645,000 | 30,610,000
Shares outstanding (shares) | 30,645,000 | 30,610,000
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) | 22,510,000 | 22,671,000
Shares outstanding (shares) | 22,510,000 | 22,671,000
[1] | Derived from the audited Consolidated Balance Sheet

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