Condensed Consolidated Statements of Changes in Equity - USD ($) $ 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, 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, net	117		117
Issued, net (in shares)		20
Restricted stock-based compensation expense	577		577
Dividends	(29,773)				(29,773)
Comprehensive income:
Net income	11,807			11,807
Unrealized net gain/(loss) on cash flow hedges	(1,521)					(1,521)
Subtotal - comprehensive income	10,286			11,807		(1,521)
Balance at Sep. 30, 2023	210,308	$ 138	270,166	822,468	(892,954)	10,490
Balance, Shares at Sep. 30, 2023		13,823
Balance at Jun. 30, 2023	216,635	$ 138	269,923	818,596	(883,001)	10,979
Balance, Shares at Jun. 30, 2023		13,822
Shares of Beneficial Interest:
Issued, net	42		42
Issued, net (in shares)		1
Restricted stock-based compensation expense	201		201
Dividends	(9,953)				(9,953)
Comprehensive income:
Net income	3,872			3,872
Unrealized net gain/(loss) on cash flow hedges	(489)					(489)
Subtotal - comprehensive income	3,383			3,872		(489)
Balance at Sep. 30, 2023	210,308	$ 138	270,166	822,468	(892,954)	10,490
Balance, Shares at Sep. 30, 2023		13,823
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, net	(180)		(180)
Issued, net (in shares)		26
Repurchased	(27)		(27)
Repurchased (in shares)		(1)
Restricted stock-based compensation expense	635		635
Dividends	(30,241)				(30,241)
Comprehensive income:
Net income	14,573			14,573
Unrealized net gain/(loss) on cash flow hedges	(4,055)					(4,055)
Subtotal - comprehensive income	10,518			14,573		(4,055)
Balance at Sep. 30, 2024	181,639	$ 138	270,826	840,634	(933,216)	3,257
Balance, Shares at Sep. 30, 2024		13,849
Balance at Jun. 30, 2024	190,701	$ 138	270,592	836,637	(923,107)	6,441
Balance, Shares at Jun. 30, 2024		13,849
Shares of Beneficial Interest:
Issued, net	27		27
Repurchased	(15)		(15)
Restricted stock-based compensation expense	222		222
Dividends	(10,109)				(10,109)
Comprehensive income:
Net income	3,997			3,997
Unrealized net gain/(loss) on cash flow hedges	(3,184)					(3,184)
Subtotal - comprehensive income	813			3,997		(3,184)
Balance at Sep. 30, 2024	$ 181,639	$ 138	$ 270,826	$ 840,634	$ (933,216)	$ 3,257
Balance, Shares at Sep. 30, 2024		13,849