CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Total	Total Shareholders' Equity	Common Stock	Treasury Stock	Paid-in Capital	Retained Earnings	Noncontrolling Interest
Balance at beginning at Dec. 31, 2020	$ 361,531	$ 341,807	$ 86	$ (2)	$ 260,389	$ 81,334	$ 19,724
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,077	9,398				9,398	679
Cancellation of treasury stock	0			2	(2)
Balance at ending at Dec. 31, 2021	371,608	351,205	86	0	260,387	90,732	20,403
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	469,004	468,262				468,262	742
Balance at ending at Dec. 31, 2022	840,612	819,467	86	0	260,387	558,994	21,145
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,250	5,937				5,937	1,313
Repurchase of treasury shares by IOR	(908)						(908)
Adjustment to noncontrolling interest	0	603			603		(603)
Balance at ending at Dec. 31, 2023	$ 846,954	$ 826,007	$ 86	$ 0	$ 260,990	$ 564,931	$ 20,947