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	$ 245,536	$ 313,331	$ 252,998
Adjustments to reconcile net income to net cash provided by operating activities:
Intangible asset impairment		7,900
Depreciation and amortization	16,050	14,754	13,681
Amortization of deferred sales commissions	43,074	64,380	57,931
Share-based compensation	47,518	54,144	53,179
Excess tax benefits from share-based payment arrangements	(4,813)	(19,135)	(12,992)
Investments (gain) loss, net	12,412	(7,496)	(18,257)
Net purchases and sales or maturities of trading securities	(75,160)	(38,662)	(25,959)
Deferred income taxes	(1,410)	728	(2,982)
Other	680	1,774	493
Changes in assets and liabilities:
Cash and cash equivalents - restricted	9,715	44,824	(28,439)
Other receivables	(3,817)	(75,428)	(5,690)
Payable to investment companies for securities and payable to customers	(5,964)	17,283	24,818
Receivables from funds and separate accounts	4,711	(2,643)	(2,581)
Other assets	(25,111)	(5,568)	(1,139)
Deferred sales commissions	(10,864)	(40,958)	(68,470)
Accounts payable and payable to third party brokers	(17,510)	21,640	8,613
Other liabilities	(1,097)	(5,826)	41,712
Net cash provided by operating activities	233,950	345,042	286,916
Cash flows from investing activities:
Purchases of available for sale and equity method securities	(27,388)	(166,302)	(241,644)
Proceeds from sales and maturities of available for sale and equity method securities	36,657	164,247	262,171
Net purchases and sales of equity method securities	5,300
Additions to property and equipment	(29,610)	(35,606)	(16,905)
Disposition of companies			22,000
Other	(2,254)	(1,447)
Net cash provided by (used in) investing activities	(22,595)	(39,108)	25,622
Cash flows from financing activities:
Dividends paid	(143,959)	(115,263)	(96,018)
Repurchase of common stock	(80,335)	(131,030)	(72,132)
Exercise of stock options			135
Excess tax benefits from share-based payment arrangements	4,813	19,135	12,992
Net cash used in financing activities	(219,481)	(227,158)	(155,023)
Net increase (decrease) in cash and cash equivalents	(8,126)	78,776	157,515
Cash and cash equivalents at beginning of period	566,621	487,845	330,330
Cash and cash equivalents at end of period	558,495	566,621	487,845
Cash paid for:
Income taxes (net)	152,262	165,189	124,196
Interest	$ 10,297	$ 10,291	$ 10,297