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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 65,355	$ 95,656
Accrued employee benefits and other personnel	15,073	18,770
Accrued consulting, outsourcing and professional fees	36,147	31,907
Accrued sub-advisory, distribution and other asset management fees	59,944	49,924
Accrued dividend payable	0	53,127
Other accrued liabilities	35,465	50,461
Total accrued liabilities	$ 211,984	$ 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 value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. 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 value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. 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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