Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative effect adjustment for adoption of new accounting guidance	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative effect adjustment for adoption of new accounting guidance
Beginning balance (in shares) at Dec. 31, 2018			255,172
Beginning balance at Dec. 31, 2018	$ 4,435,203	$ (40,310)	$ 2,546	$ 7,421,476	$ 659	$ (2,989,478)	$ (40,310)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	18,188				18,188
Net income	593,576					593,576
Repurchases of common stock (in shares)			(904)
Repurchase of common stock	(162,018)		$ (9)	(162,009)
Common stock withheld for employee tax obligations (in shares)			(27)
Common stock withheld for employee tax obligations	(5,936)			(5,936)
Issuance of common stock under benefit plans (in shares)			3,024
Issuance of common stock under benefit plans	144,557		$ 34	144,523
Stock-based compensation expense	270,134			270,134
Ending balance (in shares) at Sep. 30, 2019			257,265
Ending balance at Sep. 30, 2019	5,253,394		$ 2,571	7,668,188	18,847	(2,436,212)
Beginning balance (in shares) at Jun. 30, 2019			256,671
Beginning balance at Jun. 30, 2019	5,069,965		$ 2,565	7,564,331	(3,201)	(2,493,730)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	22,048				22,048
Net income	57,518					57,518
Repurchases of common stock (in shares)			(71)
Repurchase of common stock	(12,001)			(12,001)
Common stock withheld for employee tax obligations	(104)			(104)
Issuance of common stock under benefit plans (in shares)			665
Issuance of common stock under benefit plans	30,012		$ 6	30,006
Stock-based compensation expense	85,956			85,956
Ending balance (in shares) at Sep. 30, 2019			257,265
Ending balance at Sep. 30, 2019	5,253,394		$ 2,571	7,668,188	18,847	(2,436,212)
Beginning balance (in shares) at Dec. 31, 2019			258,993
Beginning balance at Dec. 31, 2019	6,085,244		$ 2,589	7,937,606	(1,973)	(1,852,978)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	(39,009)				(39,009)
Net income	2,107,457					2,107,457
Repurchases of common stock (in shares)			(1,807)
Repurchase of common stock	(408,033)		$ (18)	(408,015)
Common stock withheld for employee tax obligations (in shares)			(727)
Common stock withheld for employee tax obligations	(179,775)		$ (7)	(179,768)
Issuance of common stock under benefit plans (in shares)			3,715
Issuance of common stock under benefit plans	232,079		$ 37	232,042
Stock-based compensation expense	335,510			335,510
Ending balance (in shares) at Sep. 30, 2020			260,174
Ending balance at Sep. 30, 2020	8,133,473		$ 2,601	7,917,375	(40,982)	254,479
Beginning balance (in shares) at Jun. 30, 2020			260,124
Beginning balance at Jun. 30, 2020	7,519,242		$ 2,601	7,943,717	(14,121)	(412,955)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), net of tax	(26,861)				(26,861)
Net income	667,434					667,434
Repurchases of common stock (in shares)			(403)
Repurchase of common stock	(108,007)		$ (4)	(108,003)
Common stock withheld for employee tax obligations (in shares)			(141)
Common stock withheld for employee tax obligations	(40,528)		$ (1)	(40,527)
Issuance of common stock under benefit plans (in shares)			594
Issuance of common stock under benefit plans	21,704		$ 5	21,699
Stock-based compensation expense	100,489			100,489
Ending balance (in shares) at Sep. 30, 2020			260,174
Ending balance at Sep. 30, 2020	$ 8,133,473		$ 2,601	$ 7,917,375	$ (40,982)	$ 254,479