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	$ 6	(6)
Vesting of stock-based compensation awards, shares	601
Withholding of common stock upon vesting of stock-based compensation awards	$ (3)	(12,174)		(12,177)
Withholding of common stock upon vesting of stock-based compensation awards, shares	(244)
Stock-based compensation expense		3,019		3,019
Other		(30)		(30)
Net income			101,652	101,652
Ending balance at Mar. 31, 2021	$ 337	688,009	684,823	1,373,169
Ending balance, shares at Mar. 31, 2021	33,708
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	480
Withholding of common stock upon vesting of stock-based compensation awards	$ (3)	(12,135)		(12,138)
Withholding of common stock upon vesting of stock-based compensation awards, shares	(190)
Repurchases of common stock	$ (10)	(62,367)		(62,377)
Repurchases of common stock, shares	(1,013)
Stock-based compensation expense		4,064		4,064
Cash dividends declared and dividend equivalents		79	(6,736)	(6,657)
Other		(34)		(34)
Net income			142,496	142,496
Ending balance at Mar. 31, 2022	$ 330	$ 627,447	$ 1,202,085	$ 1,829,862
Ending balance, shares at Mar. 31, 2022	33,038