Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 109,872	$ 124,622
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,922	28,888
Stock-based compensation expense	36,980	29,425
Excess tax benefits from stock-based compensation	(11,222)	(19,275)
Deferred taxes	(5,724)	(1,299)
Amortization of debt issue costs	2,392	1,572
Changes in assets and liabilities, net of acquisitions:
Fees receivable, net	57,045	37,365
Deferred commissions	18,251	24,546
Prepaid expenses and other current assets	(42,347)	(23,831)
Other assets	(12,878)	(1,303)
Deferred revenues	109,595	92,593
Accounts payable, accrued, and other liabilities	(27,579)	(17,694)
Cash provided by operating activities	266,307	275,609
Investing activities:
Additions to property, equipment and leasehold improvements	(36,067)	(25,516)
Acquisitions - cash paid (net of cash acquired)	(169,853)	(107,528)
Acquisitions - increase in restricted cash (escrow)	(25,625)	(14,363)
Cash used in investing activities	(231,545)	(147,407)
Financing activities:
Proceeds from stock issued under stock plans	5,583	6,365
Proceeds from debt issuance	450,000	174,375
Payments on debt	(15,000)	(9,375)
Purchases of treasury stock	(453,000)	(387,126)
Excess tax benefits from stock-based compensation	11,222	19,275
Cash used in financing activities	(1,195)	(196,486)
Net increase (decrease) in cash and cash equivalents	33,567	(68,284)
Effects of exchange rates on cash and cash equivalents	(27,625)	(14,486)
Cash and cash equivalents, beginning of period	365,302	423,990
Cash and cash equivalents, end of period	$ 371,244	$ 341,220