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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Items Included in Consolidated Statement of Financial Condition [Abstract] |  |
Accrued employee compensation | $ 86,924 | $ 95,656
Accrued employee benefits and other personnel | 11,743 | 18,770
Accrued consulting, outsourcing and professional fees | 35,945 | 31,907
Accrued sub-advisory, distribution and other asset management fees | 57,560 | 49,924
Accrued dividend payable | 0 | 53,127
Other accrued liabilities | 38,871 | 50,461
Total accrued liabilities | $ 231,043 | $ 299,845

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