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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Authorized and outstanding equity | APAM had the following authorized and outstanding equity as of December 31, 2020 and 2019, respectively:
|  |  | Outstanding |  |  |  |
| Authorized |  | December 31, 2020 |  | December 31, 2019 |  | Voting Rights (1) |  | Economic Rights
Common shares |  |  |  |  |  |  |  |  |
Class A, par value $0.01 per share | 500,000,000 |  |  | 63,131,007 |  |  | 56,429,825 |  |  | 1 vote per share |  | Proportionate
Class B, par value $0.01 per share | 200,000,000 |  |  | 4,457,958 |  |  | 7,803,364 |  |  | 1 vote per share |  | None
Class C, par value $0.01 per share | 400,000,000 |  |  | 10,983,145 |  |  | 13,568,665 |  |  | 1 vote per share |  | None
(1) The Company’s employees to whom Artisan has granted equity have entered into a stockholders agreement with respect to all shares of APAM common stock they have acquired from the Company and any shares they may acquire from the Company in the future, pursuant to which they granted an irrevocable voting proxy to a Stockholders Committee. As of December 31, 2020, Artisan’s employees held 5,183,747 restricted shares of Class A common stock and all 4,457,958 outstanding shares of Class B common stock, all of which were subject to the agreement.
Dividends Declared | APAM declared and paid the following dividends per share during the years ended December 31, 2020, 2019 and 2018:
Type of Dividend |  | Class of Stock |  | For the Years Ended December 31,
|  |  |  | 2020 |  | 2019 |  | 2018
Quarterly |  | Common Class A |  | $ | 2.79 |  |  | $ | 2.36 |  |  | $ | 2.40 |
Special Annual |  | Common Class A |  | $ | 0.60 |  |  | $ | 1.03 |  |  | $ | 0.79 |
Schedule of Stock by Class | The following table summarizes APAM’s stock transactions for the years ended December 31, 2020, 2019 and 2018:
| Total Stock Outstanding | Class A Common Stock(1) | Class B Common Stock | Class C Common Stock
Balance at January 1, 2018 | 75,569,845 |  | 50,463,126 |  | 11,922,192 |  | 13,184,527 |
2018 Follow-On Offering | — |  | 644,424 |  | (644,424) |  | — |
Holdings Common Unit Exchanges | — |  | 1,590,611 |  | (606,066) |  | (984,545) |
Restricted Share Award Grants | 1,517,724 |  | 1,517,724 |  | — |  | — |
Restricted Share Award Net Share Settlement | (77,442) |  | (77,442) |  | — |  | — |
Employee/Partner Terminations | (67,255) |  | (67,255) |  | (2,026,453) |  | 2,026,453 |
Balance at December 31, 2018 | 76,942,872 |  | 54,071,188 |  | 8,645,249 |  | 14,226,435 |
Holdings Common Unit Exchanges | — |  | 1,499,655 |  | (841,885) |  | (657,770) |
Restricted Share Award Grants | 959,000 |  | 959,000 |  | — |  | — |
Restricted Share Award Net Share Settlement | (82,729) |  | (82,729) |  | — |  | — |
Employee/Partner Terminations | (17,289) |  | (17,289) |  | — |  | — |
Balance at December 31, 2019 | 77,801,854 |  | 56,429,825 |  | 7,803,364 |  | 13,568,665 |
2020 Follow-On Offering | — |  | 1,802,326 |  | (1,777,326) |  | (25,000) |
Holdings Common Unit Exchanges | — |  | 4,128,600 |  | (1,535,275) |  | (2,593,325) |
Delivery of Shares Underlying RSUs | 24,233 |  | 24,233 |  | — |  | — |
Restricted Share Award Grants | 916,085 |  | 916,085 |  | — |  | — |
Restricted Share Award Net Share Settlement | (126,971) |  | (126,971) |  | — |  | — |
Employee/Partner Terminations | (43,091) |  | (43,091) |  | (32,805) |  | 32,805 |
Balance at December 31, 2020 | 78,572,110 |  | 63,131,007 |  | 4,457,958 |  | 10,983,145 |
(1) There were 304,570, 297,891, and 246,581 restricted stock units outstanding at December 31, 2020, 2019, and 2018, respectively. In addition, there were 60,000 performance share units outstanding at December 31, 2020. Based on the current status of the market and performance conditions, the 60,000 unvested performance share units would ultimately result in the issuance of 90,000 shares of Class A common stock if all other vesting conditions were met. Restricted stock units and performance share units are not reflected in the table because they are not considered outstanding or issued stock.
Distributions | Holdings’ partnership distributions for the years ended December 31, 2020, 2019 and 2018 were as follows:
| For the Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Holdings Partnership Distributions to Limited Partners | $ | 85,805 |  |  | $ | 94,842 |  |  | $ | 103,434 |
Holdings Partnership Distributions to APAM | 270,044 |  |  | 226,245 |  |  | 217,396 |
Total Holdings Partnership Distributions | $ | 355,849 |  |  | $ | 321,087 |  |  | $ | 320,830 |

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