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 (in shares) at Dec. 31, 2021		48,148,000
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						(6,833,000)
Increase (Decrease) in Stockholders' Equity
Net income	133,163				133,163
Other comprehensive income (loss), net of tax	(800)			(800)
Exercise of stock options and vesting of restricted stock units	21,213		(1,665)			$ 22,878
Exercise of stock options and vesting of restricted stock units (in shares)						324,000
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(52,000)
Employee taxes paid for withheld shares upon equity award settlement	(20,915)					$ (20,915)
Stock compensation	77,991		77,991
Issuance of shares pursuant to employee stock purchase plan	12,614		12,383			$ 231
Issuance of shares pursuant to employee stock purchase plan (in shares)						36,000
Balance (in shares) at Sep. 30, 2022		48,148,000
Balance at Sep. 30, 2022	2,547,298	$ 481	1,164,359	(846)	1,406,777	$ (23,473)
Balance (in shares) at Sep. 30, 2022						(6,525,000)
Balance (in shares) at Jun. 30, 2022		48,148,000
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						(6,584,000)
Increase (Decrease) in Stockholders' Equity
Net income	53,233				53,233
Other comprehensive income (loss), net of tax	(37)			(37)
Exercise of stock options and vesting of restricted stock units	4,990		4,232			$ 758
Exercise of stock options and vesting of restricted stock units (in shares)						45,000
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(2,000)
Employee taxes paid for withheld shares upon equity award settlement	(585)					$ (585)
Stock compensation	26,912		26,912
Issuance of shares pursuant to employee stock purchase plan	4,458		4,394			$ 64
Issuance of shares pursuant to employee stock purchase plan (in shares)						16,000
Balance (in shares) at Sep. 30, 2022		48,148,000
Balance at Sep. 30, 2022	$ 2,547,298	$ 481	1,164,359	(846)	1,406,777	$ (23,473)
Balance (in shares) at Sep. 30, 2022						(6,525,000)
Balance (in shares) at Dec. 31, 2022	48,147,969	48,148,000
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	(6,364,991)					(6,365,000)
Increase (Decrease) in Stockholders' Equity
Net income	$ 127,016				127,016
Other comprehensive income (loss), net of tax	322			322
Exercise of stock options and vesting of restricted stock units	27,465		7,223			$ 20,242
Exercise of stock options and vesting of restricted stock units (in shares)						338,000
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(53,000)
Employee taxes paid for withheld shares upon equity award settlement	(19,026)					$ (19,026)
Stock compensation	80,905		80,905
Issuance of shares pursuant to employee stock purchase plan	$ 11,780		11,626			$ 154
Issuance of shares pursuant to employee stock purchase plan (in shares)						38,000
Balance (in shares) at Sep. 30, 2023	48,147,969	48,148,000
Balance at Sep. 30, 2023	$ 2,852,851	$ 481	1,309,479	(522)	1,564,870	$ (21,457)
Balance (in shares) at Sep. 30, 2023	(6,041,707)					(6,042,000)
Balance (in shares) at Jun. 30, 2023		48,148,000
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						(6,081,000)
Increase (Decrease) in Stockholders' Equity
Net income	47,011				47,011
Other comprehensive income (loss), net of tax	263			263
Exercise of stock options and vesting of restricted stock units	6,598		6,200			$ 398
Exercise of stock options and vesting of restricted stock units (in shares)						29,000
Employee taxes paid for withheld shares upon equity award settlement (in shares)						(1,000)
Employee taxes paid for withheld shares upon equity award settlement	(282)					$ (282)
Stock compensation	26,981		26,981
Issuance of shares pursuant to employee stock purchase plan	$ 4,029		3,983			$ 46
Issuance of shares pursuant to employee stock purchase plan (in shares)						11,000
Balance (in shares) at Sep. 30, 2023	48,147,969	48,148,000
Balance at Sep. 30, 2023	$ 2,852,851	$ 481	$ 1,309,479	$ (522)	$ 1,564,870	$ (21,457)
Balance (in shares) at Sep. 30, 2023	(6,041,707)					(6,042,000)