Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 9,424	$ 6,880
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:
Stock-based compensation	3,309	3,421
Realized losses on debt securities available-for-sale	716	176
Deferred income taxes	(136)	6,302
Paid-in-kind interest income (Note 6)	(416)
Depreciation and amortization	355	337
Other	(55)	(56)
Changes in operating assets and liabilities:
Securities owned, at fair value	1,106	1,292
Accounts receivable	606	(1,553)
Income taxes receivable/payable	4,297	177
Prepaid expenses	(360)	127
Other assets	160	64
Acquisition payable		(3,538)
Fund management and administration payable	(1,744)	(400)
Compensation and benefits payable	(22,003)	(9,772)
Securities sold, but not yet purchased, at fair value	(950)	(1,222)
Accounts payable and other liabilities	855	212
Net cash (used in)/provided by operating activities	(4,836)	2,447
Cash flows from investing activities:
Purchase of fixed assets	(17)	(193)
Purchase of securities held-to-maturity		(759)
Purchase of debt securities available-for-sale		(21,340)
Proceeds from held-to-maturity securities maturing or called prior to maturity	32	51
Proceeds from sales and maturities of debt securities available-for-sale	60,498	21,000
Net cash provided by/(used in) investing activities	60,513	(1,241)
Cash flows from financing activities:
Dividends paid	(4,132)	(10,930)
Shares repurchased	(734)	(3,628)
Proceeds from exercise of stock options	54	5
Net cash used in financing activities	(4,812)	(14,553)
Increase in cash flow due to changes in foreign exchange rate	593	262
Net increase/(decrease) in cash and cash equivalents	51,458	(13,085)
Cash and cash equivalents-beginning of period	54,193	92,722
Cash and cash equivalents-end of period	105,651	79,637
Supplemental disclosure of cash flow information:
Cash paid for taxes	$ 339	$ 1,247