Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Revision of Prior Period Change in Accounting Principle Adjustment [Member]	RSUs [Member]	Class A Common stock [Member]	Class A Common stock [Member] RSUs [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Treasury Stock [Member] RSUs [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Revision of Prior Period Change in Accounting Principle Adjustment [Member]
Beginning balance, Value at Dec. 31, 2018	$ 1,596,610			$ 5		$ 3,504,708			$ (118,439)	$ (1,789,664)
Beginning balance, Shares at Dec. 31, 2018				861,111
Exercise of stock options and ESPP	5,304					5,304
Exercise of stock options and ESPP, Shares				5,097
Vesting of RSUs, net of tax withholdings			$ (11,010)					$ (11,010)
Vesting of RSUs, net of tax withholdings, Shares					2,487
Acquisition-related common stock issuance	253,903			$ 1		253,902
Acquisition-related common stock issuance, Shares				63,795
Stock-based compensation expense	18,773					18,773
Retirements of treasury stock							$ 11,010			(11,010)
Net income (loss)	(128,828)									(128,828)
Other comprehensive income (loss)	6,977								6,977
Ending balance, Value at Mar. 31, 2019	1,741,729			$ 6		3,782,687			(111,462)	(1,929,502)
Ending balance, Shares at Mar. 31, 2019				932,490
Beginning balance, Value at Dec. 31, 2018	1,596,610			$ 5		3,504,708			(118,439)	(1,789,664)
Beginning balance, Shares at Dec. 31, 2018				861,111
Net income (loss)	45,425
Other comprehensive income (loss)	(34,171)
Ending balance, Value at Sep. 30, 2019	1,938,435			$ 6		3,873,706			(152,610)	(1,782,667)
Ending balance, Shares at Sep. 30, 2019				945,762
Beginning balance, Value at Mar. 31, 2019	1,741,729			$ 6		3,782,687			(111,462)	(1,929,502)
Beginning balance, Shares at Mar. 31, 2019				932,490
Exercise of stock options and ESPP	1,727					1,727
Exercise of stock options and ESPP, Shares				3,885
Vesting of RSUs, net of tax withholdings			(16,610)					(16,610)
Vesting of RSUs, net of tax withholdings, Shares					3,849
Stock-based compensation expense	21,355					21,355
Retirements of treasury stock							16,610			(16,610)
Equity component of convertible senior notes	114,974					114,974
Purchase of capped calls related to issuance of convertible senior notes	(73,830)					(73,830)
Net income (loss)	(55,830)									(55,830)
Other comprehensive income (loss)	(10,564)								(10,564)
Ending balance, Value at Jun. 30, 2019	1,722,951			$ 6		3,846,913			(122,026)	(2,001,942)
Ending balance, Shares at Jun. 30, 2019				940,224
Exercise of stock options and ESPP	5,490					5,490
Exercise of stock options and ESPP, Shares				1,452
Vesting of RSUs, net of tax withholdings			(10,808)					(10,808)
Vesting of RSUs, net of tax withholdings, Shares					4,086
Stock-based compensation expense	21,339					21,339
Retirements of treasury stock							10,808			(10,808)
Equity component of convertible senior notes	(36)					(36)
Net income (loss)	230,083									230,083
Other comprehensive income (loss)	(30,584)								(30,584)
Ending balance, Value at Sep. 30, 2019	1,938,435			$ 6		3,873,706			(152,610)	(1,782,667)
Ending balance, Shares at Sep. 30, 2019				945,762
Beginning balance, Value at Dec. 31, 2019	1,975,430			$ 6		3,898,689			(125,935)	(1,797,330)
Beginning balance, Shares at Dec. 31, 2019				950,042
Exercise of stock options and ESPP	8,802					8,802
Exercise of stock options and ESPP, Shares				2,511
Vesting of RSUs, net of tax withholdings			(14,836)					(14,836)
Vesting of RSUs, net of tax withholdings, Shares					3,273
Stock-based compensation expense	20,465					20,465
Retirements of treasury stock							14,836			(14,836)
Adoption of ASU 2016-13 | 2016-13		$ (401)									$ (401)
Net income (loss)	(103,925)									(103,925)
Other comprehensive income (loss)	(29,956)								(29,956)
Ending balance, Value at Mar. 31, 2020	1,855,579			$ 6		3,927,956			(155,891)	(1,916,492)
Ending balance, Shares at Mar. 31, 2020				955,826
Beginning balance, Value at Dec. 31, 2019	1,975,430			$ 6		3,898,689			(125,935)	(1,797,330)
Beginning balance, Shares at Dec. 31, 2019				950,042
Net income (loss)	(376,431)
Other comprehensive income (loss)	19,057								19,057
Ending balance, Value at Sep. 30, 2020	2,813,386			$ 7		5,137,353			(106,878)	(2,217,096)
Ending balance, Shares at Sep. 30, 2020				1,078,999
Beginning balance, Value at Mar. 31, 2020	1,855,579			$ 6		3,927,956			(155,891)	(1,916,492)
Beginning balance, Shares at Mar. 31, 2020				955,826
Exercise of stock options and ESPP	1,866					1,866
Exercise of stock options and ESPP, Shares				600
Vesting of RSUs, net of tax withholdings			(14,270)					(14,270)
Vesting of RSUs, net of tax withholdings, Shares					2,448
Stock-based compensation expense	25,673					25,673
Retirements of treasury stock							14,270			(14,270)
Net income (loss)	(150,300)									(150,300)
Other comprehensive income (loss)	17,685								17,685
Ending balance, Value at Jun. 30, 2020	1,736,233			$ 6		3,955,495			(138,206)	(2,081,062)
Ending balance, Shares at Jun. 30, 2020				958,874
Exercise of stock options and ESPP	5,462					5,462
Exercise of stock options and ESPP, Shares				1,093
Vesting of RSUs, net of tax withholdings			$ (13,828)					$ (13,828)
Vesting of RSUs, net of tax withholdings, Shares					2,468
Acquisition-related common stock issuance	1,137,673			$ 1		1,137,672
Acquisition-related common stock issuance, Shares				116,564
Stock-based compensation expense	38,724					38,724
Retirements of treasury stock							$ 13,828			(13,828)
Net income (loss)	(122,206)									(122,206)
Other comprehensive income (loss)	31,328								31,328
Ending balance, Value at Sep. 30, 2020	$ 2,813,386			$ 7		$ 5,137,353			$ (106,878)	$ (2,217,096)
Ending balance, Shares at Sep. 30, 2020				1,078,999