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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 57,077	$ 88,960
Accrued consulting, outsourcing and professional fees	29,340	29,658
Accrued sub-advisory, distribution and other asset management fees	46,455	42,365
Accrued dividend payable	0	47,179
Accrued income taxes	14,387	5,583
Other accrued liabilities	46,573	51,313
Total accrued liabilities	$ 193,832	$ 265,058

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