Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)
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
Repurchase 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
Repurchase 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
Beginning balance (in shares) at Dec. 31, 2020		259,890
Beginning balance at Dec. 31, 2020	8,686,815	$ 2,599	7,894,027	(68,480)	858,669
Increase (Decrease) in Stockholders' Equity
Other comprehensive income loss, net of tax	80,017			80,017
Net income	1,571,990				1,571,990
Repurchase of common stock (in shares)		(5,282)
Repurchase of common stock	(1,067,225)	$ (53)	(1,067,172)
Common stock withheld for employee tax obligations (in shares)		(633)
Common stock withheld for employee tax obligations	(134,223)	$ (6)	(134,217)
Issuance of common stock under benefit plans (in shares)		2,231
Issuance of common stock under benefit plans	66,729	$ 22	66,707
Stock-based compensation expense	326,605		326,605
Ending balance (in shares) at Sep. 30, 2021		256,206
Ending balance at Sep. 30, 2021	9,530,708	$ 2,562	7,085,950	11,537	2,430,659
Beginning balance (in shares) at Jun. 30, 2021		259,114
Beginning balance at Jun. 30, 2021	9,196,396	$ 2,591	7,640,233	(25,159)	1,578,731
Increase (Decrease) in Stockholders' Equity
Other comprehensive income loss, net of tax	36,696			36,696
Net income	851,928				851,928
Repurchase of common stock (in shares)		(3,293)
Repurchase of common stock	(642,273)	$ (33)	(642,240)
Common stock withheld for employee tax obligations (in shares)		(144)
Common stock withheld for employee tax obligations	(28,559)	$ (1)	(28,558)
Issuance of common stock under benefit plans (in shares)		529
Issuance of common stock under benefit plans	12,867	$ 5	12,862
Stock-based compensation expense	103,653		103,653
Ending balance (in shares) at Sep. 30, 2021		256,206
Ending balance at Sep. 30, 2021	$ 9,530,708	$ 2,562	$ 7,085,950	$ 11,537	$ 2,430,659