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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
May 04, 2017 | Apr. 20, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Subsequent events |  |  |  |
Payments of dividends |  |  | $ 10,114 | $ 9,378
KCG Holdings | Subsequent Events. |  |  |  |
Subsequent events |  |  |  |
Cash transaction value (in dollars per share) |  | $ 20.00 |  |
Total agreement value |  | $ 1,400,000 |  |
KCG Holdings | Scenario forecast | Subsequent Events. |  |  |  |
Subsequent events |  |  |  |
Face amount |  | $ 1,650,000 |  |
Voting power (as a percent) |  | 24.50% |  |
Class A | Subsequent Events. |  |  |  |
Subsequent events |  |  |  |
Dividends declared (in dollars per share) | $ 0.24 |  |  |
Class A | Temasek and North Island Holdings | KCG Holdings | Scenario forecast | Subsequent Events. |  |  |  |
Subsequent events |  |  |  |
Sale of common stock value |  | $ 750,000 |  |

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