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Stockholder's Equity - Changes in Number of Shares of Class A Stock Outstanding (Details) - Class A Stock - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Class A Stock outstanding, beginning of period | 12,156,174 | 12,586,043 | 12,447,036 | 12,381,778
Issued pursuant to share-based compensation plans | 0 | 6,603 | 86,451 | 210,868
Repurchased and canceled pursuant to the stock buy-back | (885,230) | 0 | (1,262,543) | 0
Class A Stock outstanding, end of period | 11,270,944 | 12,592,646 | 11,270,944 | 12,592,646

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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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