Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 124,622	$ 121,383
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,888	25,464
Stock-based compensation expense	29,425	27,049
Excess tax benefits from stock-based compensation	(19,275)	(18,412)
Deferred taxes	(1,299)	4,989
Amortization and write-off of debt issue costs	1,572	2,107
Changes in assets and liabilities, net of acquisitions:
Fees receivable, net	37,365	69,732
Deferred commissions	24,546	10,055
Prepaid expenses and other current assets	(23,831)	(20,840)
Other assets	(1,303)	(3,064)
Deferred revenues	92,593	64,662
Accounts payable, accrued, and other liabilities	(17,694)	(41,056)
Cash provided by operating activities	275,609	242,069
Investing activities:
Additions to property, equipment and leasehold improvements	(25,516)	(27,772)
Acquisitions - cash paid (net of cash acquired)	(107,528)	0
Acquisitions - increase in restricted cash (escrow)	(14,363)	0
Cash used in investing activities	(147,407)	(27,772)
Financing activities:
Proceeds from stock issued under stock plans	6,365	4,539
Proceeds from debt issuance	174,375	203,750
Payments for debt issuance costs	0	(3,553)
Payments on debt	(9,375)	(203,750)
Purchases of treasury stock	(387,126)	(157,251)
Excess tax benefits from stock-based compensation	19,275	18,412
Cash used in financing activities	(196,486)	(137,853)
Net (decrease) increase in cash and cash equivalents	(68,284)	76,444
Effects of exchange rates on cash and cash equivalents	(14,486)	(1,775)
Cash and cash equivalents, beginning of period	423,990	299,852
Cash and cash equivalents, end of period	$ 341,220	$ 374,521