CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Capital in excess of par value	Cumulative net income	Cumulative dividends	Accumulated other comprehensive income/(loss)
Balance at Dec. 31, 2021	$ 235,327	$ 138	$ 268,515	$ 789,559	$ (823,998)	$ 1,113
Balance, Shares at Dec. 31, 2021		13,785
Shares of Beneficial Interest:
Issued	177		177
Issued (in shares)		18
Restricted stock-based compensation expense	780		780
Dividends	(39,183)				(39,183)
Comprehensive income:
Net income	21,102			21,102
Unrealized net gain/(loss) on cash flow hedges	10,898					10,898
Subtotal - comprehensive income	32,000			21,102		10,898
Balance at Dec. 31, 2022	229,101	$ 138	269,472	810,661	(863,181)	12,011
Balance, Shares at Dec. 31, 2022		13,803
Shares of Beneficial Interest:
Issued	146		146
Issued (in shares)		21
Restricted stock-based compensation expense	780		780
Dividends	(39,794)				(39,794)
Comprehensive income:
Net income	15,400			15,400
Unrealized net gain/(loss) on cash flow hedges	(4,699)					(4,699)
Subtotal - comprehensive income	10,701			15,400		(4,699)
Balance at Dec. 31, 2023	200,934	$ 138	270,398	826,061	(902,975)	7,312
Balance, Shares at Dec. 31, 2023		13,824
Shares of Beneficial Interest:
Issued	(131)		(131)
Issued (in shares)		27
Repurchased	(28)		(28)
Restricted stock-based compensation expense	853		853
Dividends	(40,421)				(40,421)
Comprehensive income:
Net income	19,234			19,234
Unrealized net gain/(loss) on cash flow hedges	(900)					(900)
Subtotal - comprehensive income	18,334			19,234		(900)
Balance at Dec. 31, 2024	$ 179,541	$ 138	$ 271,092	$ 845,295	$ (943,396)	$ 6,412
Balance, Shares at Dec. 31, 2024		13,851