CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Preferred Stock	Common Stock	Treasury Stock	Paid-in Capital	Retained Earnings	Noncontrolling Interest
Balance at beginning at Dec. 31, 2020	$ 330,406	$ 236,791	$ 1,801	$ 162	$ (2)	$ 62,092	$ 172,738	$ 93,615
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,445	3,347					3,347	3,098
Cancellation of treasury shares	0				2	(2)
Balance at end at Dec. 31, 2021	336,851	240,138	1,801	162	0	62,090	176,085	96,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	475,317	373,349					373,349	101,968
Balance at end at Dec. 31, 2022	812,168	613,487	1,801	162	0	62,090	549,434	198,681
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,251	3,968					3,968	1,283
Repurchase of treasury shares by IOR	(908)							(908)
Adjustment of noncontrolling interest	0	(452)				(452)		452
Balance at end at Dec. 31, 2023	$ 816,511	$ 617,003	$ 1,801	$ 162	$ 0	$ 61,638	$ 553,402	$ 199,508