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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Items Included in Consolidated Statement of Financial Condition [Abstract] |  |
Accrued employee compensation | $ 63,313 | $ 79,735
Accrued consulting, outsourcing and professional fees | 29,487 | 24,428
Accrued sub-advisory, distribution and other asset management fees | 38,631 | 41,666
Accrued dividend payable | 0 | 44,596
Other accrued liabilities | 53,937 | 50,100
Total accrued liabilities | $ 185,368 | $ 240,525

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