Stockholder's Equity - Changes in Number of Shares of Class A Stock Outstanding (Details) - Class A Stock - shares	3 Months Ended	6 Months Ended
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

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of shares issued under share-based payment arrangement.

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Number of shares of common and preferred stock retired from treasury during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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