CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2021	$ 2,324,032	$ 481	$ 1,075,650	$ (46)	$ 1,273,614	$ (25,667)
Balance (in shares) at Dec. 31, 2021		48,148,000
Balance (in shares) at Dec. 31, 2021						(6,833,000)
Increase (Decrease) in Stockholders' Equity
Net income	79,930				79,930
Other comprehensive loss, net of tax	(763)			(763)
Exercise of stock options and vesting of restricted stock units	16,223		(5,897)			$ 22,120
Exercise of stock options and vesting of restricted stock units (in shares)						279,000
Employee taxes paid for withheld shares upon equity award settlement	(20,330)					$ (20,330)
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(50,000)
Stock compensation	51,079		51,079
Issuance of shares pursuant to employee stock purchase plan	8,156		7,989			$ 167
Issuance of shares pursuant to employee stock purchase plan (in shares)						20,000
Balance at Jun. 30, 2022	2,458,327	$ 481	1,128,821	(809)	1,353,544	$ (23,710)
Balance (in shares) at Jun. 30, 2022		48,148,000
Balance (in shares) at Jun. 30, 2022						(6,584,000)
Balance at Mar. 31, 2022	2,387,734	$ 481	1,098,933	(743)	1,313,598	$ (24,535)
Balance (in shares) at Mar. 31, 2022		48,148,000
Balance (in shares) at Mar. 31, 2022						(6,697,000)
Increase (Decrease) in Stockholders' Equity
Net income	39,946				39,946
Other comprehensive loss, net of tax	(66)			(66)
Exercise of stock options and vesting of restricted stock units	8,178		(288)			$ 8,466
Exercise of stock options and vesting of restricted stock units (in shares)						122,000
Employee taxes paid for withheld shares upon equity award settlement	(7,743)					$ (7,743)
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(21,000)
Stock compensation	25,800		25,800
Issuance of shares pursuant to employee stock purchase plan	4,478		4,376			$ 102
Issuance of shares pursuant to employee stock purchase plan (in shares)						12,000
Balance at Jun. 30, 2022	2,458,327	$ 481	1,128,821	(809)	1,353,544	$ (23,710)
Balance (in shares) at Jun. 30, 2022		48,148,000
Balance (in shares) at Jun. 30, 2022						(6,584,000)
Balance at Dec. 31, 2022	$ 2,624,389	$ 481	1,209,725	(844)	1,437,854	$ (22,827)
Balance (in shares) at Dec. 31, 2022	48,147,969	48,148,000
Balance (in shares) at Dec. 31, 2022	(6,364,991)					(6,365,000)
Increase (Decrease) in Stockholders' Equity
Net income	$ 80,005				80,005
Other comprehensive loss, net of tax	59			59
Exercise of stock options and vesting of restricted stock units	20,867		1,023			$ 19,844
Exercise of stock options and vesting of restricted stock units (in shares)						309,000
Employee taxes paid for withheld shares upon equity award settlement	(18,744)					$ (18,744)
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(52,000)
Stock compensation	53,924		53,924
Issuance of shares pursuant to employee stock purchase plan	7,751		7,643			$ 108
Issuance of shares pursuant to employee stock purchase plan (in shares)						27,000
Balance at Jun. 30, 2023	$ 2,768,251	$ 481	1,272,315	(785)	1,517,859	$ (21,619)
Balance (in shares) at Jun. 30, 2023	48,147,969	48,148,000
Balance (in shares) at Jun. 30, 2023	(6,081,263)					(6,081,000)
Balance at Mar. 31, 2023	$ 2,686,133	$ 481	1,239,945	(750)	1,468,729	$ (22,272)
Balance (in shares) at Mar. 31, 2023		48,148,000
Balance (in shares) at Mar. 31, 2023						(6,244,000)
Increase (Decrease) in Stockholders' Equity
Net income	49,130				49,130
Other comprehensive loss, net of tax	(35)			(35)
Exercise of stock options and vesting of restricted stock units	12,734		1,692			$ 11,042
Exercise of stock options and vesting of restricted stock units (in shares)						173,000
Employee taxes paid for withheld shares upon equity award settlement	(10,452)					$ (10,452)
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(26,000)
Stock compensation	26,028		26,028
Issuance of shares pursuant to employee stock purchase plan	4,713		4,650			$ 63
Issuance of shares pursuant to employee stock purchase plan (in shares)						16,000
Balance at Jun. 30, 2023	$ 2,768,251	$ 481	$ 1,272,315	$ (785)	$ 1,517,859	$ (21,619)
Balance (in shares) at Jun. 30, 2023	48,147,969	48,148,000
Balance (in shares) at Jun. 30, 2023	(6,081,263)					(6,081,000)