Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net (loss) income	$ (55,848)	$ 96,614
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	100,087	30,252
Stock-based compensation expense	53,573	26,607
Deferred taxes	(78,004)	(845)
Amortization and write-off of deferred financing fees	9,475	2,158
Changes in assets and liabilities, net of acquisitions:
Fees receivable, net	(44,939)	(20,380)
Deferred commissions	477	15,321
Prepaid expenses and other current assets	(22,453)	667
Other assets	(17,328)	(1,537)
Deferred revenues	167,412	106,771
Accounts payable, accrued, and other liabilities	(29,734)	(93,845)
Cash provided by operating activities	82,718	161,783
Investing activities:
Additions to property, equipment and leasehold improvements	(41,627)	(25,337)
Acquisitions - cash paid (net of cash acquired)	(2,622,342)	(29,896)
Cash used in investing activities	(2,663,969)	(55,233)
Financing activities:
Proceeds from employee stock purchase plan	5,662	4,702
Proceeds from borrowings	2,885,000	830,000
Payments for deferred financing fees	(51,170)	(4,975)
Payments on borrowings	(119,812)	(820,000)
Purchases of treasury stock	(33,786)	(51,967)
Cash provided by (used in) financing activities	2,685,894	(42,240)
Net increase in cash and cash equivalents	104,643	64,310
Effects of exchange rates on cash and cash equivalents	10,406	7,767
Cash and cash equivalents, beginning of period	474,233	372,976
Cash and cash equivalents, end of period	$ 589,282	$ 445,053