CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings (deficit) [Member]	Accumulated other comprehensive income (loss) [Member]	Total
Balance at beginning of period at Dec. 31, 2019	$ 756	$ 1,280,760	$ (889,066)	$ 4,890	$ 397,340
Balance (in shares) at Dec. 31, 2019	75,619,000
Net income			1,752,302		1,752,302
Other comprehensive income (loss)				(7,045)	(7,045)
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes		17,314			17,314
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares	48,000
Net issuance of common stock upon exercise of stock options	$ 3	46,279			46,282
Net issuance of common stock upon exercise of stock options, shares	288,000
Share-based compensation		21,259			21,259
Share repurchases, including fees	$ (48)	(84,771)	(2,002,375)		(2,087,194)
Share repurchases, including fees, shares	(4,832,000)
Balance at end of period at Dec. 31, 2020	$ 711	1,280,841	(1,139,139)	(2,155)	140,258
Balance (in shares) at Dec. 31, 2020	71,123,000
Net income			2,164,685		2,164,685
Other comprehensive income (loss)				(4,644)	(4,644)
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes		18,511			18,511
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares	39,000
Net issuance of common stock upon exercise of stock options	$ 4	67,757			67,761
Net issuance of common stock upon exercise of stock options, shares	404,000
Share-based compensation		23,054			23,054
Share repurchases, including fees	$ (45)	(84,655)	(2,391,348)		$ (2,476,048)
Share repurchases, including fees, shares	(4,537,000)				(4,537,000)
Balance at end of period at Dec. 31, 2021	$ 670	1,305,508	(1,365,802)	(6,799)	$ (66,423)
Balance (in shares) at Dec. 31, 2021	67,029,000				67,029,042
Net income			2,172,650		$ 2,172,650
Other comprehensive income (loss)				9,795	9,795
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes		19,864			19,864
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares	34,000
Net issuance of common stock upon exercise of stock options	$ 3	60,974			60,977
Net issuance of common stock upon exercise of stock options, shares	251,000
Share-based compensation		24,650			24,650
Share repurchases, including fees	$ (49)	(99,508)	(3,182,708)		$ (3,282,265)
Share repurchases, including fees, shares	(4,961,000)				(4,961,000)
Balance at end of period at Dec. 31, 2022	$ 624	$ 1,311,488	$ (2,375,860)	$ 2,996	$ (1,060,752)
Balance (in shares) at Dec. 31, 2022	62,353,000				62,353,221