Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 23,678	$ 59,522
Non-cash items included in net income:
Income tax expense	14,761	40,573
Depreciation and amortization	978	696
Stock-based compensation	11,092	7,878
Deferred rent	(173)	(26)
Accretion to interest income and other	(75)	9
Changes in operating assets and liabilities:
Accounts receivable	10,207	(7,253)
Other assets	(1,371)	(1,892)
Acquisition payable	(218)	693
Fund management and administration payable	414	1,216
Compensation and benefits payable	(18,944)	7,402
Income taxes payable	2,260	840
Accounts payable and other liabilities	1,336	490
Net cash provided by operating activities	43,945	110,148
Cash flows from investing activities:
Purchase of fixed assets	(654)	(1,606)
Purchase of investments	(6,048)	(11,353)
Acquisition less cash acquired	(11,818)
Proceeds from investments called prior to maturity	13,579	1,681
Net cash used in investing activities	(4,941)	(11,278)
Cash flows from financing activities:
Dividends paid	(32,748)	(32,867)
Shares repurchased	(39,116)	(23,689)
Proceeds from exercise of stock options	107	4,471
Net cash used in financing activities	(71,757)	(52,085)
Increase/(decrease) in cash flows due to changes in foreign exchange rate	815	(77)
Net (decrease)/increase in cash and cash equivalents	(31,938)	46,708
Cash and cash equivalents-beginning of period	210,070	165,284
Cash and cash equivalents-end of period	178,132	211,992
Supplemental disclosure of cash flow information:
Cash paid for taxes	$ 6,664	$ 551