Condensed Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common
Shares Outstanding, Beginning Balance at Dec. 31, 2023		27,761,299
Stockholders' Equity, Beginning Balance at Dec. 31, 2023	$ 2,516,939	$ 301	$ 349,907	$ 2,301,348	$ (134,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	138,061			138,061
Stock options exercised, shares		135,300
Stock options exercised	5,495		(2,299)		7,794
Stock-based compensation expense	3,539		3,539
Repurchase of common shares, shares		(200,000)
Repurchase of common shares	(25,278)				(25,278)
Deferral of executive and director compensation	29		29
Deferred Compensation Arrangement with Individual, Shares Issued		55,059
Deferred Compensation Arrangement with Individual, Distribution Paid	0		(3,137)		3,137
Shares Outstanding, Ending Balance at Mar. 31, 2024		27,751,658
Stockholders' Equity, Ending Balance at Mar. 31, 2024	2,638,785	$ 301	348,039	2,439,409	(148,964)
Shares Outstanding, Beginning Balance at Dec. 31, 2024		27,063,023
Stockholders' Equity, Beginning Balance at Dec. 31, 2024	2,939,677	$ 301	348,705	2,865,073	(274,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	111,237			111,237
Stock options exercised, shares		24,000
Stock options exercised	1,106		(1,053)		2,159
Stock-based compensation expense	$ 4,200		4,200
Repurchase of common shares, shares	400,000	(422,000)
Repurchase of common shares	$ (50,055)				(50,055)
Deferral of executive and director compensation	169		169
Deferred Compensation Arrangement with Individual, Shares Issued		107,599
Deferred Compensation Arrangement with Individual, Distribution Paid	0		(9,654)		9,654
Shares Outstanding, Ending Balance at Mar. 31, 2025		26,772,622
Stockholders' Equity, Ending Balance at Mar. 31, 2025	$ 3,006,334	$ 301	$ 342,367	$ 2,976,310	$ (312,644)