Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Investment management fees	$ 138,364	$ 133,495	$ 407,477	$ 404,123
Underwriting and distribution fees	122,819	115,786	367,659	353,928
Shareholder service fees	32,182	31,060	95,786	91,920
Total	293,365	280,341	870,922	849,971
Operating expenses:
Underwriting and distribution	147,408	138,111	439,961	419,628
Compensation and related costs (including share-based compensation of $12,299, $11,473, $36,217 and $33,676, respectively)	42,343	36,105	128,432	116,618
General and administrative	15,774	20,979	57,172	54,920
Subadvisory fees	4,921	7,291	16,400	23,684
Depreciation	3,188	3,866	9,876	11,074
Total	213,634	206,352	651,841	625,924
Operating income	79,731	73,989	219,081	224,047
Investment and other income	2,632	(4,178)	7,906	(771)
Interest expense	(2,826)	(2,837)	(8,477)	(8,569)
Income from continuing operations before provision for income taxes	79,537	66,974	218,510	214,707
Provision for income taxes	27,421	27,603	78,332	81,871
Income from continuing operations	52,116	39,371	140,178	132,836
Income (loss) from discontinued operations, net of tax expense of $473, $358, $1,278 and $1,966, respectively	(43,590)	463	(42,547)	2,601
Net income	$ 8,526	$ 39,834	$ 97,631	$ 135,437
Net income per share, basic and diluted:
Income from continuing operations (in dollars per share)	$ 0.61	$ 0.46	$ 1.63	$ 1.55
Income (loss) from discontinued operations (in dollars per share)	$ (0.51)		$ (0.49)	$ 0.03
Net income (in dollars per share)	$ 0.10	$ 0.46	$ 1.14	$ 1.58
Weighted average shares outstanding:
Basic (in shares)	85,753	85,776	85,817	85,951
Diluted (in shares)	85,755	85,782	85,819	85,964