Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income	$ 40,167	$ 28,351
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	15,017	10,128
Stock-based compensation plan expense	15,495	16,729
Excess tax benefits from stock-based compensation plans	(4,751)	(7,556)
Deferred taxes	(2,191)	(3,358)
Amortization of debt issue costs	411	837
Changes in assets and liabilities:
Fees receivable, net	(19,089)	9,631
Deferred commissions	7,047	8,352
Prepaid expenses and other current assets	8,205	(22,964)
Other assets	5,436	12,927
Deferred revenues	79,141	74,208
Accounts payable, accrued, and other liabilities	(136,308)	(121,622)
Cash provided by operating activities	8,580	5,663
Investing activities:
Additions to property, equipment and leasehold improvements	(6,560)	(11,632)
Acquisitions - cash paid (net of cash acquired)	(800)	0
Cash used in investing activities	(7,360)	(11,632)
Financing activities:
Proceeds from stock-based compensation plans and ESP Plan	2,580	2,076
Proceeds from borrowings	70,000	265,000
Payments on borrowings	(5,000)	(5,000)
Purchases of treasury stock	(45,487)	(324,042)
Excess tax benefits from stock-based compensation plans	4,751	7,556
Cash provided (used) in financing activities	26,844	(54,410)
Net increase (decrease) in cash and cash equivalents	28,064	(60,379)
Effects of exchange rates on cash and cash equivalents	2,903	(23,270)
Cash and cash equivalents, beginning of period	372,976	365,302
Cash and cash equivalents, end of period	$ 403,943	$ 281,653