Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income	$ 27,621	$ 83,463
Loss (income) from discontinued operations	42,704	(10,209)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	49,300	53,630
Stock-based compensation expense	34,808	36,061
Excess tax benefit from stock-based compensation	0	(5,889)
Deferred income tax expense	67,497	4,830
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	(5,390)	(1,454)
Other non-cash items	2,204	2,634
Total adjustments to reconcile net income to net cash provided by operating activities	148,419	89,812
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	197,408	218,821
Inventories	(2,811)	(2,072)
Prepaid expenses and other current assets	(22,736)	(22,943)
Other assets	(8,845)	1,250
Income taxes, net	(30,223)	6,155
Accounts payable	(8,222)	(8,921)
Accrued expenses and other current liabilities	(27,959)	(6,570)
Deferred revenues	(26,064)	(43,098)
Other liabilities	2,241	1,767
Total changes in operating assets and liabilities, net of the effects of acquisitions	72,789	144,389
Net cash provided by operating activities of continuing operations	291,533	307,455
Net cash provided by operating activities of discontinued operations	(42,249)	32,510
Net cash provided by operating activities	249,284	339,965
Investing Activities
Purchases of available-for-sale investments	(272,060)	(466,718)
Proceeds from sales of available-for-sale investments	458,020	234,242
Proceeds from maturities of available-for-sale investments	63,516	139,244
Purchases of property and equipment	(19,746)	(26,335)
Cash paid for acquisitions, net of cash acquired	(60,449)	0
Cash paid for licensing agreements and technology	(1,934)	(24,148)
Other	1,285	1,008
Net cash provided by investing activities of continuing operations	168,632	(142,707)
Net cash used for investing activities of discontinued operations	(3,891)	(15,348)
Net cash provided by (used in) investing activities	164,741	(158,055)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	902	6,024
Proceeds from credit facility	100,000	0
Repayment of acquired debt	(4,000)	0
Excess tax benefit from stock-based compensation	0	5,889
Stock repurchases, net	(500,000)	(28,689)
Cash paid for tax withholding on vested stock awards	(34,868)	(22,428)
Transfer of cash to GoTo Business resulting from the separation	(28,523)	0
Net cash used in financing activities	(466,489)	(39,204)
Effect of exchange rate changes on cash and cash equivalents	3,485	2,082
Change in cash and cash equivalents	(48,979)	144,788
Cash and cash equivalents at beginning of period, including cash of discontinued operations of $120,861 and $57,762, respectively	956,956	368,518
Cash and cash equivalents at end of period	907,977	513,306
Less cash of discontinued operations	0	(59,143)
Cash and cash equivalents at end of period	$ 907,977	$ 454,163