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Redeemable Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward] |  |  |
Balance at December 31, 2017 | $ 4,178 |  |
Business acquisition | 55,500 |  |
Net income (loss) | 515 | $ 1,420 | $ 261
Net subscriptions (redemptions) (distributions) and other | (2,712) |  |
Balance at December 31, 2018 | 57,481 | 4,178 |
Consolidated investment products |  |  |
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward] |  |  |
Balance at December 31, 2017 | 4,178 |  |
Business acquisition | 0 |  |
Net income (loss) | (472) |  |
Net subscriptions (redemptions) (distributions) and other | (1,322) |  |
Balance at December 31, 2018 | 2,384 | 4,178 |
Affiliate Noncontrolling Interests |  |  |
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward] |  |  |
Balance at December 31, 2017 | 0 |  |
Business acquisition | 55,500 |  |
Net income (loss) | 987 |  |
Net subscriptions (redemptions) (distributions) and other | (1,390) |  |
Balance at December 31, 2018 | $ 55,097 | $ 0 |

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