Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 409,949	$ 263,170
Loss from discontinued operations	0	42,704
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	161,582	149,813
Stock-based compensation expense	144,306	127,219
Deferred income tax expense	2,508	32,367
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	7,226	(8,063)
Other non-cash items	5,558	9,608
Total adjustments to reconcile net income to net cash provided by operating activities	321,180	310,944
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	296,286	216,139
Inventories	(7,549)	(3,350)
Prepaid expenses and other current assets	(51,726)	(15,836)
Other assets	(17,540)	(2,393)
Income taxes, net	(83,273)	(58,278)
Accounts payable	2,945	(17,039)
Accrued expenses and other current liabilities	40,503	(17,372)
Deferred revenues	(85,072)	(10,746)
Other liabilities	3,233	2,645
Total changes in operating assets and liabilities, net of the effects of acquisitions	97,807	93,770
Net cash provided by operating activities of continuing operations	828,936	710,588
Net cash used in operating activities of discontinued operations	0	(56,070)
Net cash provided by operating activities	828,936	654,518
Investing Activities
Purchases of available-for-sale investments	(435,876)	(966,067)
Proceeds from sales of available-for-sale investments	442,360	678,533
Proceeds from maturities of available-for-sale investments	320,259	377,719
Purchases of property and equipment	(54,289)	(61,670)
Cash paid for acquisitions, net of cash acquired	(65,983)	(60,449)
Cash paid for licensing agreements and technology	(2,140)	(5,865)
Other	1,399	490
Net cash provided by investing activities of continuing operations	205,730	(37,309)
Net cash used in investing activities of discontinued operations	0	(3,891)
Net cash provided by investing activities	205,730	(41,200)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	164	2,094
Proceeds from credit facility	0	165,000
Repayment of credit facility	0	(125,000)
Repayment of acquired debt	(5,674)	(4,000)
Stock repurchases, net	(881,153)	(574,957)
Cash paid for tax withholding on vested stock awards	(53,589)	(71,179)
Transfer of cash to GoTo Business resulting from the separation	0	(28,523)
Net cash used in financing activities	(940,252)	(636,565)
Effect of exchange rate changes on cash and cash equivalents	(4,362)	7,160
Change in cash and cash equivalents	90,052	(16,087)
Cash and cash equivalents at beginning of period, including cash of discontinued operations of $0 and $120,861, respectively	1,115,130	956,956
Cash and cash equivalents at end of period	$ 1,205,182	$ 940,869