Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Total
Beginning balance at Dec. 31, 2020	$ 334	$ 697,200	$ 583,171	$ 1,280,705
Beginning balance, shares at Dec. 31, 2020	33,351
Vesting of stock-based compensation awards	$ 7	(7)
Vesting of stock-based compensation awards, shares	675
Withholding of common stock upon vesting of stock-based compensation awards	$ (3)	(13,723)		(13,726)
Withholding of common stock upon vesting of stock-based compensation awards, shares	(265)
Stock-based compensation expense		10,760		10,760
Cash dividends declared and dividend equivalents		109	(10,236)	(10,127)
Other		(133)		(133)
Net income			333,538	333,538
Ending balance at Sep. 30, 2021	$ 338	694,206	906,473	1,601,017
Ending balance, shares at Sep. 30, 2021	33,761
Beginning balance at Jun. 30, 2021	$ 338	690,707	797,613	1,488,658
Beginning balance, shares at Jun. 30, 2021	33,761
Stock-based compensation expense		3,548		3,548
Cash dividends declared and dividend equivalents		54	(5,117)	(5,063)
Other		(103)		(103)
Net income			113,977	113,977
Ending balance at Sep. 30, 2021	$ 338	694,206	906,473	1,601,017
Ending balance, shares at Sep. 30, 2021	33,761
Beginning balance at Dec. 31, 2021	$ 338	697,845	1,066,325	1,764,508
Beginning balance, shares at Dec. 31, 2021	33,761
Vesting of stock-based compensation awards	$ 5	(5)
Vesting of stock-based compensation awards, shares	516
Withholding of common stock upon vesting of stock-based compensation awards	$ (2)	(12,733)		(12,735)
Withholding of common stock upon vesting of stock-based compensation awards, shares	(200)
Repurchases of common stock	$ (23)	(120,623)		(120,646)
Repurchases of common stock, shares	(2,305)
Stock-based compensation expense		14,950		14,950
Cash dividends declared and dividend equivalents		297	(19,977)	(19,680)
Other		(34)		(34)
Net income			445,637	445,637
Ending balance at Sep. 30, 2022	$ 318	579,697	1,491,985	2,072,000
Ending balance, shares at Sep. 30, 2022	31,772
Beginning balance at Jun. 30, 2022	$ 323	596,727	1,354,114	1,951,164
Beginning balance, shares at Jun. 30, 2022	32,273
Repurchases of common stock	$ (5)	(22,336)		(22,341)
Repurchases of common stock, shares	(501)
Stock-based compensation expense		5,159		5,159
Cash dividends declared and dividend equivalents		147	(6,602)	(6,455)
Net income			144,473	144,473
Ending balance at Sep. 30, 2022	$ 318	$ 579,697	$ 1,491,985	$ 2,072,000
Ending balance, shares at Sep. 30, 2022	31,772