Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Consolidated net income	$ 18,376	$ 19,908
Non-cash items included in consolidated net income :
Depreciation and amortization	3,688	3,867
Net investment gains	(8,134)	(4,256)
Restricted stock units recognized and common stock issued	27,734	27,473
Deferred taxes	(1,250)	2,907
Deferred gain on the sale of certain merchant banking assets	(129)	(406)
Changes in operating assets and liabilities:
Advisory fees receivable	5,967	(3,419)
Other receivables and assets	(2,239)	(4,137)
Due from affiliates		(140)
Compensation payable	(25,896)	(6,715)
Accounts payable and accrued expenses	4,470	7,864
Settlement of restricted stock units in cash		(2,093)
Net cash provided by operating activities	22,587	40,853
Investing activities:
Purchases of investments	(6,536)	(1,064)
Proceeds from sales of investments	16,670	48,467
Distributions from investments	780	1,100
Purchases of property and equipment	(1,378)	(2,340)
Net cash provided by investing activities	9,536	46,163
Financing activities:
Proceeds of revolving bank loan	29,945	40,570
Repayment of revolving bank loan	(30,220)	(82,900)
Distributions to noncontrolling interests		(958)
Dividends paid	(28,007)	(28,641)
Purchase of treasury stock	(19,584)	(37,022)
Net tax benefit (cost) from the delivery of restricted stock units	(4,496)	601
Net cash used in financing activities	(52,362)	(108,350)
Effect of exchange rate changes on cash and cash equivalents	(201)	2,486
Net decrease in cash and cash equivalents	(20,440)	(18,848)
Cash and cash equivalents, beginning of the period	62,050	78,227
Cash and cash equivalents, end of the period	41,610	59,379
Supplemental disclosure of cash flow information:
Cash paid for interest	542	1,207
Cash paid for taxes, net of refunds	$ 11,982	$ 3,917