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, 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,659	5,862				5,862	797
Repurchase of treasury shares by IOR	(802)						(802)
Adjustment to noncontrolling interest	0	409			409		(409)
Balance at ending at Dec. 31, 2024	$ 852,811	$ 832,278	$ 86	$ 0	$ 261,399	$ 570,793	$ 20,533