Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Capital	Retained Earnings	Accumulated  Other Comprehensive Income	Treasury Stock
Beginning Balance, Shares at Dec. 31, 2021		5,173,000
Beginning Balance, value at Dec. 31, 2021	$ 252,589	$ 5,173	$ 33,415	$ 206,875	$ 7,494	$ (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,532			14,532
Dividends paid ($4.50 per common share)	(23,060)			(23,060)
Change in fair value of interest rate derivatives and other	11,727				11,727
Ending Balance, Shares at Mar. 31, 2022		5,173,000
Ending Balance, value at Mar. 31, 2022	$ 255,788	$ 5,173	33,415	198,347	19,221	(368)
Beginning Balance, Shares at Dec. 31, 2022	5,173,450	5,173,000
Beginning Balance, value at Dec. 31, 2022	$ 236,499	$ 5,173	33,865	172,243	25,586	(368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,226			11,226
Dividends paid ($4.50 per common share)	(23,072)			(23,072)
Change in fair value of interest rate derivatives and other	$ (3,644)				(3,644)
Ending Balance, Shares at Mar. 31, 2023	5,173,450	5,173,000
Ending Balance, value at Mar. 31, 2023	$ 221,009	$ 5,173	$ 33,865	$ 160,397	$ 21,942	$ (368)