Statements of Consolidated Shareholders' Equity - USD ($) $ in Thousands	Total	3.99% Senior unsecured notes [Member]	4.00% Senior unsecured notes [Member]	Common shares	Additional paid-in capital	Common shares subscribed, unissued	Retained earnings	Accumulated other comprehensive income (loss), net of tax	Treasury Stock, Common	Common shares subscription receivable
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2022	$ 129,800			$ 38,550	$ 162,828	$ 23,864	$ 293,993	$ (5,588)	$ (363,502)	$ (20,345)
Increase (decrease) in stockholders' equity [Roll Forward]
Net income	72,140						72,140
Change in 401KSOP and ESOP related shares	(18,692)			758	12,397		(31,847)
Shares sold to employees	38,664				18,252				20,412
Options exercised	2,232				(1,707)				3,939
Subscription shares	3,953				692	(1,032)			611	3,682
Stock-based compensation	$ 5,500				5,500
Dividends declared per share	$ 0.09
Dividends	$ (3,850)						(3,850)
Defined benefit pension plans	(77)
Net of tax amount	803							803
Shares purchased	(78,076)								(78,076)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2023	$ 152,474			39,308	197,962	22,832	330,436	(4,785)	(416,616)	(16,663)
Common shares, at end of year at Dec. 31, 2023	77,328,434
Increase (decrease) in stockholders' equity [Roll Forward]
Net income	$ 64,796						64,796
Change in 401KSOP and ESOP related shares	(6,871)			(451)	9,102		(15,522)
Shares sold to employees	31,289				16,514				14,775
Options exercised	9,324				210				9,114
Subscription shares	3,427				598	(1,732)			732	3,829
Stock-based compensation	$ 1,460				1,460
Dividends declared per share	$ 0.10
Dividends	$ (4,185)						(4,185)
Defined benefit pension plans	53
Net of tax amount	(1,988)							(1,988)
Shares purchased	(76,137)								(76,137)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2024	173,589			38,857	225,846	21,100	375,525	(6,773)	(468,132)	(12,834)
Balance at the end of the year at Dec. 31, 2024	$ (6,773)
Common shares, at end of year at Dec. 31, 2024	77,713,386
Common shares, at beginning of year at Dec. 31, 2023	77,328,434
Increase (decrease) in stockholders' equity [Roll Forward]
Shares purchased, shares	3,387,128
Shares sold	(1,514,094)
Net income	$ 33,325						33,325
Change in 401KSOP and ESOP related shares	(17,999)			188	9,204		(27,391)
Shares sold to employees	41,580				21,826				19,754
Options exercised	9,981				(658)				10,639
Subscription shares	3,735				1,169	(1,955)			1,565	2,956
Stock-based compensation	$ (257)				(257)
Dividends declared per share	$ 0.11
Dividends	$ (4,314)						(4,314)
Defined benefit pension plans	(61)
Net of tax amount	1,162							1,162
Shares purchased	(97,750)								(97,750)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2025	143,052			$ 39,045	$ 257,130	$ 19,145	$ 377,145	$ (5,611)	$ (533,924)	$ (9,878)
Balance at the end of the year at Dec. 31, 2025	$ (5,611)
Common shares, at end of year at Dec. 31, 2025	78,090,260
Common shares, at beginning of year at Dec. 31, 2024	77,713,386
Balance at the beginning of the year at Dec. 31, 2024	$ (6,773)
Increase (decrease) in stockholders' equity [Roll Forward]
Common shares, subscribed, value	$ (26,720)
Common shares, subscribed, shares	(1,476,250)
Shares purchased, shares	3,882,280
Shares sold	(1,840,414)
Senior unsecured notes, interest rate		3.99%	4.00%