Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Capital	Retained Earnings	Accumulated  Other Comprehensive (Loss) Income	Treasury Stock
Beginning balance, (in shares) at Dec. 31, 2023		5,173,000
Beginning balance, value at Dec. 31, 2023	$ 237,657	$ 5,173	$ 34,315	$ 182,336	$ 16,201	$ (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,167			31,167
Dividends paid	(69,277)			(69,277)
Change in fair value of interest rate derivatives	(9,308)				(9,308)
Deferred stock unit grants	450		450
Ending balance, (in shares) at Sep. 30, 2024		5,173,000
Ending balance, value at Sep. 30, 2024	190,689	$ 5,173	34,765	144,226	6,893	(368)
Beginning balance, (in shares) at Jun. 30, 2024		5,173,000
Beginning balance, value at Jun. 30, 2024	212,520	$ 5,173	34,765	160,649	12,301	(368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,678			6,678
Dividends paid	(23,101)			(23,101)
Change in fair value of interest rate derivatives	(5,408)				(5,408)
Ending balance, (in shares) at Sep. 30, 2024		5,173,000
Ending balance, value at Sep. 30, 2024	$ 190,689	$ 5,173	34,765	144,226	6,893	(368)
Beginning balance, (in shares) at Dec. 31, 2024	5,173,450	5,173,000
Beginning balance, value at Dec. 31, 2024	$ 176,859	$ 5,173	34,765	133,402	3,887	(368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,400			24,400
Dividends paid	(69,314)			(69,314)
Change in fair value of interest rate derivatives	(4,013)				(4,013)
Deferred stock unit grants	$ 394		394
Ending balance, (in shares) at Sep. 30, 2025	5,173,450	5,173,000
Ending balance, value at Sep. 30, 2025	$ 128,326	$ 5,173	35,159	88,488	(126)	(368)
Beginning balance, (in shares) at Jun. 30, 2025		5,173,000
Beginning balance, value at Jun. 30, 2025	145,447	$ 5,173	35,159	105,632	(149)	(368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,968			5,968
Dividends paid	(23,112)			(23,112)
Change in fair value of interest rate derivatives	$ 23				23
Ending balance, (in shares) at Sep. 30, 2025	5,173,450	5,173,000
Ending balance, value at Sep. 30, 2025	$ 128,326	$ 5,173	$ 35,159	$ 88,488	$ (126)	$ (368)