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v3.21.2

Equity - Activity for Class B Common Stock and Treasury Stock (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance (in shares) | 11,947,439 | 9,226,413 | 10,174,013 | 8,375,077
Stock Award Activity (in shares) | (10,000) | (22,500) | (734,674) | (728,831)
Purchase of Treasury Stock (in shares) | 593,619 | 866,900 | 3,091,719 | 2,424,567
Ending Balance (in shares) | 12,531,058 | 10,070,813 | 12,531,058 | 10,070,813
Class B Shares |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance (in shares) | 97,558,017 | 100,279,043 | 99,331,443 | 101,130,379
Stock Award Activity (in shares) | 10,000 | 22,500 | 734,674 | 728,831
Purchase of Treasury Stock (in shares) | (593,619) | (866,900) | (3,091,719) | (2,424,567)
Ending Balance (in shares) | 96,974,398 | 99,434,643 | 96,974,398 | 99,434,643
Beginning Balance (in shares) |  |  | 10,174,013 |
Purchase of Treasury Stock (in shares) |  |  | 3,100,000 |
Ending Balance (in shares) | 12,531,058 |  | 12,531,058 |

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- Definition The increase (decrease) during the period in the number of shares issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
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