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Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Repurchase of Class A common stock, shares | 233,000 |  |
Forfeitures of restricted Class A common stock, shares | 22,000 | 232,000 |
Exchange class A to class B common stock, shares |  | 11,036,273 |
Dividends declared per share of common stock | $ 0.56 | $ 0.72 | $ 0.70
Dividends declared and paid per share of common stock | $ 0.56 | $ 0.72 | $ 0.70
Class A Common Stock [Member] |  |  |
Equity-based compensation, shares | 434,694 | 527,951 | 570,944
Grant of exchangeability and redemption of limited partnership interests, shares | 15,008,431 | 18,287,721 | 9,179,295
Issuance of Class A common stock (net of costs), shares | 212,711 | 26,003,424 | 1,994,670
Repurchase of Class A common stock, shares | 233,172 | 788,788 | 1,386,769
Forfeitures of restricted Class A common stock, shares | 22,000 | 231,602 | 183,246
Cantor purchase of Cantor units from BGC Holdings upon redemption of Founding/Working Partner Units, units |  |  | 1,179,788
Issuance of Class A common stock and RSUs for acquisitions, shares | 1,039,000 | 1,744,000 |
Exchange class A to class B common stock, shares |  | 11,036,000 |
Forfeiture of Class A common stock, shares | 22,046 |  |
Class A Common Stock [Member] | Smith Mack [Member] |  |  |
Issuance of Class A common stock and RSUs for acquisitions, shares | 1,039,452 | 1,743,963 | 1,923,854
Class A Common Stock [Member] | Partnership Units [Member] |  |  |
Redemption of FPUs | 56,878 | 108,967 | 729,802

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