Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net (loss) income	$ (104,028)	$ 127,097
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	168,651	46,004
Stock-based compensation expense	67,930	36,128
Deferred taxes	(99,450)	(13,415)
Amortization and write-off of deferred financing fees	13,236	2,611
Changes in assets and liabilities, net of acquisitions:
Fees receivable, net	(15,090)	26,242
Deferred commissions	3,231	12,376
Prepaid expenses and other current assets	(32,159)	(43,402)
Other assets	(76,548)	21,597
Deferred revenues	198,353	114,197
Accounts payable, accrued, and other liabilities	108,141	(47,172)
Cash provided by operating activities	232,267	282,263
Investing activities:
Additions to property, equipment and leasehold improvements	(75,619)	(36,877)
Acquisitions - cash paid (net of cash acquired)	(2,634,809)	(29,363)
Cash used in investing activities	(2,710,428)	(66,240)
Financing activities:
Proceeds from employee stock purchase plan	8,550	6,931
Proceeds from borrowings	3,025,000	747,500
Payments for deferred financing fees	(51,171)	(4,975)
Payments on borrowings	(339,624)	(827,500)
Purchases of treasury stock	(37,188)	(52,889)
Cash provided by (used in) financing activities	2,605,567	(130,933)
Net increase in cash and cash equivalents	127,406	85,090
Effects of exchange rates on cash and cash equivalents	28,377	7,668
Cash and cash equivalents, beginning of period	474,233	372,976
Cash and cash equivalents, end of period	$ 630,016	$ 465,734