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, 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	232,480			232,480
Stock options exercised, shares		40,000
Stock options exercised	1,864		(1,791)		3,655
Stock-based compensation expense	8,116		8,116
Repurchase of common shares, shares		(882,000)
Repurchase of common shares	(100,199)				(100,199)
Deferral of executive and director compensation	198		198
Deferred Compensation Arrangement with Individual, Shares Issued		118,763
Deferred Compensation Arrangement with Individual, Distribution Paid	0		(10,692)		10,692
Shares Outstanding, Ending Balance at Jun. 30, 2025		26,339,786
Stockholders' Equity, Ending Balance at Jun. 30, 2025	3,082,136	$ 301	344,536	3,097,553	(360,254)
Shares Outstanding, Beginning Balance at Mar. 31, 2025		26,772,622
Stockholders' Equity, Beginning Balance at Mar. 31, 2025	3,006,334	$ 301	342,367	2,976,310	(312,644)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	121,243			121,243
Stock options exercised, shares		16,000
Stock options exercised	758		(738)		1,496
Stock-based compensation expense	3,916		3,916
Repurchase of common shares, shares		(460,000)
Repurchase of common shares	(50,144)				(50,144)
Deferral of executive and director compensation	29		29
Deferred Compensation Arrangement with Individual, Shares Issued		11,164
Deferred Compensation Arrangement with Individual, Distribution Paid	0		(1,038)		1,038
Shares Outstanding, Ending Balance at Jun. 30, 2025		26,339,786
Stockholders' Equity, Ending Balance at Jun. 30, 2025	3,082,136	$ 301	344,536	3,097,553	(360,254)
Shares Outstanding, Beginning Balance at Dec. 31, 2025		25,762,709
Stockholders' Equity, Beginning Balance at Dec. 31, 2025	3,166,190	$ 301	344,118	3,268,014	(446,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	146,900			146,900
Stock options exercised, shares		117,300
Stock options exercised	5,576		(6,569)		12,145
Stock-based compensation expense	8,746		8,746
Repurchase of common shares, shares		(742,000)
Repurchase of common shares	(100,116)				(100,116)
Deferral of executive and director compensation	124		124
Deferred Compensation Arrangement with Individual, Shares Issued		99,677
Deferred Compensation Arrangement with Individual, Distribution Paid	0		(10,242)		10,242
Shares Outstanding, Ending Balance at Jun. 30, 2026		25,237,686
Stockholders' Equity, Ending Balance at Jun. 30, 2026	3,227,420	$ 301	336,177	3,414,914	(523,972)
Shares Outstanding, Beginning Balance at Mar. 31, 2026		25,590,109
Stockholders' Equity, Beginning Balance at Mar. 31, 2026	3,192,332	$ 301	333,362	3,335,846	(477,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	79,068			79,068
Stock options exercised, shares		28,300
Stock options exercised	1,477		(1,537)		3,014
Stock-based compensation expense	$ 4,561		4,561
Repurchase of common shares, shares	400,000	(383,000)
Repurchase of common shares	$ (50,050)				(50,050)
Deferral of executive and director compensation	32		32
Deferred Compensation Arrangement with Individual, Shares Issued		2,277
Deferred Compensation Arrangement with Individual, Distribution Paid	0		(241)		241
Shares Outstanding, Ending Balance at Jun. 30, 2026		25,237,686
Stockholders' Equity, Ending Balance at Jun. 30, 2026	$ 3,227,420	$ 301	$ 336,177	$ 3,414,914	$ (523,972)