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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 36,632	$ 95,656
Accrued employee benefits and other personnel	13,023	18,770
Accrued consulting, outsourcing and professional fees	32,032	31,907
Accrued sub-advisory, distribution and other asset management fees	49,155	49,924
Accrued dividend payable	0	53,127
Accrued income taxes	33,001	3,507
Other accrued liabilities	35,392	46,954
Total accrued liabilities	$ 199,235	$ 299,845

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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