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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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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