Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (184,658)	$ 4,698
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	40,749	16,909
Stock-based compensation expense	40,128	31,482
(Gain) loss from foreign currency, sales of investments, assets and other, net	(385)	1,491
(Accretion) and amortization on marketable debt securities, net	(385)	(1,300)
Noncash lease expense	3,161
Noncash interest expense	1,008
Change in deferred income taxes and other	(34,031)	1,273
Changes in operating assets and liabilities:
Accounts receivable, net	(26,510)	14,009
Prepaid expenses and other assets	7,160	(7,223)
Accounts payable	(7,288)	(16,261)
Deferred revenue	155,989	28,126
Income tax payable	60	(5,042)
Operating lease and other liabilities	105,166	(30,974)
Net cash provided by (used in) operating activities	100,164	37,188
Cash flows from investing activities:
Purchases of investments	(124,091)	(184,089)
Maturities of investments	16,500	302,000
Sales of investments	4,987	9,999
Acquisition of property and equipment	(9,958)	(3,679)
Proceeds from sale of property and equipment	90	28
Business acquisitions, net of cash acquired and restricted cash held in escrow	(299,357)	(222,075)
Release of restricted cash escrow from business combinations	(10,000)	(22,800)
Other investing activities, net		97
Net cash provided by (used in) investing activities	(421,829)	(120,519)
Cash flows from financing activities:
Proceeds from issuance of debt, net	672,682
Purchase of capped calls	(73,830)
Taxes paid related to net share settlement of stockholders' equity awards	(27,620)	(13,972)
Repurchases of common stock		(65,418)
Proceeds from issuance of common stock	7,031	4,158
Repayment of debt	(101,364)
Other financing activities, net	(327)
Net cash provided by (used in) financing activities	476,572	(75,232)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	11,446	(1,931)
Net change in cash, cash equivalents and restricted cash	166,353	(160,494)
Cash, cash equivalents and restricted cash, beginning of period	579,996	405,677
Cash, cash equivalents and restricted cash, end of period	746,349	$ 245,183
Noncash investing activity:
Acquisition-related common stock issuance	$ 253,903