Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income	$ 90,776	$ 83,189
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,438	16,855
Stock-based compensation expense	20,617	19,574
Excess tax benefits from stock-based compensation	(14,275)	(17,114)
Deferred taxes	4,450	(1,747)
Amortization and write-off of debt issue costs	1,100	1,472
Changes in assets and liabilities, net of acquisition:
Fees receivable, net	2,909	27,071
Deferred commissions	18,039	8,847
Prepaid expenses and other current assets	(4,996)	(3,938)
Other assets	(3,708)	(2,528)
Deferred revenues	77,100	67,320
Accounts payable, accrued, and other liabilities	(57,692)	(58,685)
Cash provided by operating activities	152,758	140,316
Investing activities:
Additions to property, equipment and leasehold improvements	(19,151)	(19,635)
Acquisitions - cash paid (net of cash acquired)	(107,528)	0
Acquisitions - increase in restricted cash (escrow)	(14,363)	0
Cash used in investing activities	(141,042)	(19,635)
Financing activities:
Proceeds from stock issued under stock plans	5,064	3,355
Proceeds from debt issuance	175,625	201,875
Payments for debt issuance costs	0	(3,553)
Payments on debt	(5,625)	(201,875)
Purchases of treasury stock	(307,448)	(98,000)
Excess tax benefits from stock-based compensation	14,275	17,114
Cash used in financing activities	(118,109)	(81,084)
Net (decrease) increase in cash and cash equivalents	(106,393)	39,597
Effects of exchange rates on cash and cash equivalents	328	(6,086)
Cash and cash equivalents, beginning of period	423,990	299,852
Cash and cash equivalents, end of period	$ 317,925	$ 333,363