UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net (loss)	$ (25,372)	$ (28,717)
Adjustments to reconcile net (loss) to cash (used in) provided by operating activities
Stock-based compensation	23,175	18,350
Loss on capped call transactions	18,592	0
Deferred income taxes	(9,231)	1,455
Amortization of deferred contract costs	8,497	8,301
Lease expense	3,852	3,403
Amortization of debt discount and issuance costs	1,719	0
Amortization of intangible assets and depreciation	4,919	6,755
Amortization of investments	0	315
Foreign currency transaction loss	5,947	3,712
Other non-cash	(1,374)	16
Change in operating assets and liabilities, net	(49,047)	9,113
Cash (used in) provided by operating activities	(18,323)	22,703
Investing activities
Purchases of investments	(1,490)	(7,224)
Proceeds from maturities and called investments	0	8,548
Sales of investments	1,424	0
Investment in property and equipment	(12,496)	(2,790)
Cash (used in) investing activities	(12,562)	(1,466)
Financing activities
Proceeds from issuance of convertible senior notes	600,000	0
Payment of debt issuance costs	(14,527)	0
Purchase of capped calls related to convertible senior notes	(51,900)	0
Dividend payments to shareholders	(2,388)	(2,363)
Common stock repurchases	(29,011)	(23,224)
Cash provided by (used in) financing activities	502,174	(25,587)
Effect of exchange rate changes on cash and cash equivalents	(1,510)	295
Net increase (decrease) in cash and cash equivalents	469,779	(4,055)
Cash and cash equivalents, beginning of period	68,363	114,422
Cash and cash equivalents, end of period	$ 538,142	$ 110,367