CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 67,113	$ 74,864
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,035	3,330
Amortization of deferred sales commissions	13,084	16,120
Share-based compensation	12,473	13,086
Excess tax benefits from share-based payment arrangements	(747)	(1,132)
Gain on sale of available for sale investment securities	(2,345)	(1,182)
Net purchases and sales or maturities of trading securities	54	479
Gain on trading securities	(930)	(1,961)
Loss on sale and retirement of property and equipment	18	410
Capital gains and dividends reinvested		(4)
Deferred income taxes	230	3,809
Changes in assets and liabilities:
Cash and cash equivalents - restricted	(3,504)	19,258
Other receivables	69,464	13,533
Payable to investment companies for securities and payable to customers	(64,793)	(43,206)
Receivables from funds and separate accounts	5,539	553
Other assets	(3,845)	2,044
Deferred sales commissions	(3,374)	(18,839)
Accounts payable and payable to third party brokers	(11,319)	(2,169)
Other liabilities	9,118	9,942
Net cash provided by operating activities	90,271	88,935
Cash flows from investing activities:
Purchases of available for sale investment securities	(25,890)	(16,826)
Proceeds from sales and maturities of available for sale investment securities	28,835	20,142
Additions to property and equipment	(9,159)	(13,825)
Net cash used in investing activities	(6,214)	(10,509)
Cash flows from financing activities:
Dividends paid	(35,979)	(28,986)
Repurchase of common stock	(4,599)	(17,675)
Excess tax benefits from share-based payment arrangements	747	1,132
Net cash used in financing activities	(39,831)	(45,529)
Net increase in cash and cash equivalents	44,226	32,897
Cash and cash equivalents at beginning of period	566,621	487,845
Cash and cash equivalents at end of period	$ 610,847	$ 520,742