Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 80,052	$ 61,051	$ 51,537
Non-cash items included in net income:
Income tax expense	53,018	12,403
Depreciation and amortization and other	1,006	821	439
Stock-based compensation	10,900	8,137	6,459
Deferred rent	(83)	1,572	706
Accretion to interest income and other	4	(72)	116
Changes in operating assets and liabilities:
Accounts receivable	(9,321)	(369)	(5,020)
Other assets	(1,864)	99	(579)
Acquisition contingent payment	2,185
Fund management and administration payable	2,978	(445)	3,470
Compensation and benefits payable	13,286	(186)	12,122
Accounts payable and other liabilities	2,950	(381)	874
Net cash provided by operating activities	155,111	82,630	70,124
Cash flows from investing activities:
Purchase of fixed assets	(2,616)	(4,894)	(6,211)
Purchase of investments	(14,467)	(3,225)	(3,597)
Cash acquired on acquisition		1,349
Proceeds from the redemption of investments	4,764	939	2,781
Net cash used in investing activities	(12,319)	(5,831)	(7,027)
Cash flows from financing activities:
Dividends paid	(78,540)	(10,785)
Shares repurchased	(24,116)	(6,531)	(1,613)
Proceeds from exercise of stock options and warrants	4,520	1,544	1,586
Net cash used in financing activities	(98,136)	(15,772)	(27)
Increase/(decrease) in cash flow due to changes in foreign exchange rate	130	(59)
Net increase in cash and cash equivalents	44,786	60,968	63,070
Cash and cash equivalents-beginning of year	165,284	104,316	41,246
Cash and cash equivalents-end of year	210,070	165,284	104,316
Supplemental disclosure of cash flow information:
Cash paid for taxes	$ 1,262	$ 66	38
Noncash investing and financing activities:
Cashless exercise of stock options and warrants			$ 267