Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Operating activities:
Net income	$ 83,189		$ 75,705
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	16,855		13,744
Stock-based compensation expense	19,574	[1]	18,802	[1]
Excess tax benefits from stock-based compensation	(17,114)		(16,728)
Deferred taxes	(1,747)		(3,401)
Amortization and write-off of debt issue costs	1,472		1,008
Changes in assets and liabilities, net of acquisition:
Fees receivable, net	27,071		30,660
Deferred commissions	8,847		9,726
Prepaid expenses and other current assets	(3,938)		(7,437)
Other assets	(2,528)		(1,845)
Deferred revenues	67,320		46,727
Accounts payable, accrued, and other liabilities	(58,685)		(67,509)
Cash provided by operating activities	140,316		99,452
Investing activities:
Additions to property, equipment and leasehold improvements	(19,635)		(20,642)
Acquisition (net of cash acquired)	0		(9,509)
Cash used in investing activities	(19,635)		(30,151)
Financing activities:
Proceeds from stock issued under stock plans	3,355		8,751
Proceeds from debt issuance	201,875		15,088
Payments for debt issuance costs	(3,553)		0
Payments on debt	(201,875)		(15,000)
Purchases of treasury stock	(98,000)		(84,675)
Excess tax benefits from stock-based compensation	17,114		16,728
Cash used by financing activities	(81,084)		(59,108)
Net increase in cash and cash equivalents	39,597		10,193
Effects of exchange rates on cash and cash equivalents	(6,086)		(2,401)
Cash and cash equivalents, beginning of period	299,852		142,739
Cash and cash equivalents, end of period	$ 333,363		$ 150,531

[1] Includes charges of $1.7 million and $0.2 million for the three months ended June 30, 2013 and 2012, respectively, for awards to retirement-eligible employees since these awards vest on an accelerated basis. The six months ended June 30, 2013 and 2012 include retirement-eligible charges of $8.8 million and $3.2 million, respectively.