Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Operating activities:
Net income	$ 75,705		$ 61,414
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	13,744		17,554
Stock-based compensation expense	18,802	[1]	16,993	[1]
Excess tax benefits from stock-based compensation	(16,728)		(21,940)
Deferred taxes	(3,401)		(1,395)
Amortization of debt issue costs	1,008		1,182
Changes in assets and liabilities, net of acquisition:
Fees receivable, net	30,660		11,915
Deferred commissions	9,726		7,561
Prepaid expenses and other current assets	(7,437)		(2,098)
Other assets	(1,845)		(792)
Deferred revenues	46,727		35,478
Accounts payable, accrued, and other liabilities	(67,509)		(61,959)
Cash provided by operating activities	99,452		63,913
Investing activities:
Additions to property, equipment and leasehold improvements	(20,642)		(9,460)
Acquisition (net of cash acquired)	(9,509)
Cash used in investing activities	(30,151)		(9,460)
Financing activities:
Proceeds from stock issued under stock plans	8,751		16,347
Proceeds from debt issuance	15,088		10,000
Payments on debt	(15,000)		(10,156)
Purchases of treasury stock	(84,675)		(87,859)
Excess tax benefits from stock-based compensation	16,728		21,940
Cash used by financing activities	(59,108)		(49,728)
Net increase in cash and cash equivalents	10,193		4,725
Effects of exchange rates on cash and cash equivalents	(2,401)		435
Cash and cash equivalents, beginning of period	142,739		120,181
Cash and cash equivalents, end of period	$ 150,531		$ 125,341

[1] The three months ended June 30, 2012 and 2011 includes charges of $0.2 million and $0.3 million, respectively, related to awards to retirement-eligible employees, since a portion of the awards granted to retirement-eligible employees vest immediately. The six months ended June 30, 2012 and 2011 includes charges of $3.2 million and $2.8 million, respectively, for retirement-eligible employees.