Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income	$ 36,433	$ 44,987
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	16,530	15,017
Stock-based compensation expense	22,576	15,495
Deferred taxes	(11,998)	(2,191)
Amortization and write-off of debt issuance costs	468	411
Changes in assets and liabilities:
Fees receivable, net	(57,919)	(19,089)
Deferred commissions	3,002	7,047
Prepaid expenses and other current assets	(5,315)	8,205
Other assets	(16,730)	5,436
Deferred revenues	92,373	79,141
Accounts payable, accrued, and other liabilities	(109,025)	(141,128)
Cash (used in) provided by operating activities	(29,605)	13,331
Investing activities:
Additions to property, equipment and leasehold improvements	(10,700)	(6,560)
Business acquisitions - cash paid (net of cash acquired)	(129,315)	(800)
Cash used in investing activities	(140,015)	(7,360)
Financing activities:
Proceeds from employee stock purchase plan	3,022	2,580
Proceeds from borrowings	955,000	70,000
Payments for debt issuance costs	0	0
Payments on borrowings	(18,773)	(5,000)
Purchases of treasury stock	(21,978)	(45,487)
Cash provided by financing activities	917,271	22,093
Net increase in cash and cash equivalents	747,651	28,064
Effects of exchange rates on cash and cash equivalents	6,007	2,903
Cash and cash equivalents, beginning of period	474,233	372,976
Cash and cash equivalents, end of period	$ 1,227,891	$ 403,943