Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Operating activities:
Net income	$ 121,383		$ 107,080
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	25,464		21,407
Stock-based compensation expense	27,049	[1]	28,021	[1]
Excess tax benefits from stock-based compensation	(18,412)		(20,366)
Deferred taxes	4,989		(3,268)
Amortization and write-off of debt issue costs	2,107		1,512
Changes in assets and liabilities, net of acquisition:
Fees receivable, net	69,732		54,157
Deferred commissions	10,055		13,202
Prepaid expenses and other current assets	(20,840)		(18,803)
Other assets	(3,064)		2,429
Deferred revenues	64,662		60,681
Accounts payable, accrued, and other liabilities	(41,056)		(37,301)
Cash provided by operating activities	242,069		208,751
Investing activities:
Additions to property, equipment and leasehold improvements	(27,772)		(30,800)
Acquisition (net of cash acquired)	0		(10,336)
Cash used in investing activities	(27,772)		(41,136)
Financing activities:
Proceeds from stock issued under stock plans	4,539		10,560
Proceeds from debt issuance	203,750		22,500
Payments for debt issuance costs	(3,553)		0
Payments on debt	(203,750)		(22,500)
Purchases of treasury stock	(157,251)		(89,300)
Excess tax benefits from stock-based compensation	18,412		20,366
Cash used by financing activities	(137,853)		(58,374)
Net increase in cash and cash equivalents	76,444		109,241
Effects of exchange rates on cash and cash equivalents	(1,775)		3,411
Cash and cash equivalents, beginning of period	299,852		142,739
Cash and cash equivalents, end of period	$ 374,521		$ 255,391

[1] Includes charges of $1.8 million and $1.5 million for the three months ended September 30, 2013 and 2012, respectively, for awards to retirement-eligible employees since these awards vest on an accelerated basis. The nine months ended September 30, 2013 and 2012 include retirement-eligible charges of $10.6 million and $4.7 million, respectively.