CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury stock	Total
Balance at Dec. 31, 2020	$ 3,193	$ 4,537,982	$ 6,432,074	$ 3,034	$ (5,815,423)	$ 5,160,860
Balance (in shares) at Dec. 31, 2020	638,662				(110,565)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	$ 0	17,949	0	0	$ 0	17,949
Exercise of stock options	$ 3	6,758	0	0	$ 0	6,761
Exercise of stock options (in shares)	492				0
Unrealized gain, net on available-for-sale securities	$ 0	0	0	24	$ 0	24
Repurchase of common stock	$ 0	0	0	0	$ (13,419)	(13,419)
Repurchase of common stock (in shares)	0				(150)
Foreign currency translation	$ 0	0	0	(27,932)	$ 0	(27,932)
Net income	0	0	315,194	0	0	315,194
Balance at Mar. 31, 2021	$ 3,196	4,562,689	6,747,268	(24,874)	$ (5,828,842)	5,459,437
Balance (in shares) at Mar. 31, 2021	639,154				(110,715)
Balance at Dec. 31, 2021	$ 3,200	4,652,620	7,809,549	(69,165)	$ (5,829,253)	6,566,951
Balance (in shares) at Dec. 31, 2021	640,043				(110,720)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		16,175				16,175
Exercise of stock options	$ 3	4,507				$ 4,510
Exercise of stock options (in shares)	485					114
Unrealized loss, net on available-for-sale securities				(4,059)		$ (4,059)
Repurchase of common stock					$ (12,187)	(12,187)
Repurchase of common stock (in shares)					(166)
Foreign currency translation				1,079		1,079
Net income			294,203			294,203
Balance at Mar. 31, 2022	$ 3,203	$ 4,673,302	$ 8,103,752	$ (72,145)	$ (5,841,440)	$ 6,866,672
Balance (in shares) at Mar. 31, 2022	640,528				(110,886)