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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Items Included in Consolidated Statement of Financial Condition [Abstract] |  |
Accrued employee compensation | $ 107,495 | $ 100,566
Accrued employee benefits and other personnel | 9,797 | 9,852
Accrued voluntary separation program | 21,058 | 53,821
Accrued consulting, outsourcing and professional fees | 32,285 | 37,009
Accrued sub-advisory, distribution and other asset management fees | 49,405 | 52,916
Accrued dividend payable | 61,104 | 58,051
Other accrued liabilities | 37,801 | 47,148
Accrued liabilities | $ 318,945 | $ 359,363

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