Income Taxes - Tax Effect of Significant Temporary Differences (Details) - CTRS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Income from unconsolidated joint ventures	$ 31	$ 5
Federal and state tax net operating loss carryforwards	1,462	1,636
Federal and state tax capital loss carryforwards	152	179
Gross deferred tax asset	1,645	1,820
Valuation allowance	(1,645)	(1,820)
Net deferred tax asset after valuation allowance	0	0
Net deferred tax asset	$ 1,600	$ 1,800