CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock, Common [Member]	Series A Nonconvertible Preferred Stock [Member] Preferred Stock [Member]
BALANCE at Dec. 31, 2021	$ 1,099,914	$ 491	$ 658,728	$ 500,212	$ (18,235)	$ (41,284)	$ 2
BALANCE (in shares) at Dec. 31, 2021		49,065,924				1,365,648	200,000
Net income	210,061			210,061
Other comprehensive income (loss)	(217)				(217)
Cash dividends declared	(56,996)			(56,996)
Stock-based compensation and ESPP activity, net of taxes withheld	22,607		22,607
Stock-based compensation and ESPP activity, net of taxes withheld, Shares		70,106
BALANCE at Dec. 31, 2022	1,275,369	$ 491	681,335	653,277	(18,452)	$ (41,284)	$ 2
BALANCE (in shares) at Dec. 31, 2022		49,136,030				1,365,648	200,000
Net income	203,011			203,011
Other comprehensive income (loss)	17,366				17,366
Cash dividends declared	(66,735)			(66,735)
Stock-based compensation and ESPP activity, net of taxes withheld	$ 18,215	$ (4)	18,219
Stock-based compensation and ESPP activity, net of taxes withheld, Shares		(405,004)
Common shares repurchased (in shares)	0
BALANCE at Dec. 31, 2023	$ 1,447,226	$ 487	699,554	789,553	(1,086)	$ (41,284)	$ 2
BALANCE (in shares) at Dec. 31, 2023		48,731,026				1,365,648	200,000
Net income	222,079			222,079
Other comprehensive income (loss)	31				31
Cash dividends declared	(76,977)			(76,977)
Stock-based compensation and ESPP activity, net of taxes withheld	$ 24,166	$ 1	24,165
Stock-based compensation and ESPP activity, net of taxes withheld, Shares		103,515
Common shares repurchased (in shares)	0
BALANCE at Dec. 31, 2024	$ 1,616,525	$ 488	$ 723,719	$ 934,655	$ (1,055)	$ (41,284)	$ 2
BALANCE (in shares) at Dec. 31, 2024		48,834,541				1,365,648	200,000