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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Items Included in Consolidated Statement of Financial Condition [Abstract] |  |
Accrued employee compensation | $ 75,745 | $ 96,991
Accrued employee benefits and other personnel | 13,870 | 9,222
Accrued consulting, outsourcing and professional fees | 31,167 | 28,610
Accrued sub-advisory, distribution and other asset management fees | 54,157 | 46,245
Accrued dividend payable | 0 | 52,452
Other accrued liabilities | 48,278 | 39,281
Total accrued liabilities | $ 223,217 | $ 272,801

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