Income Taxes - Tax Effect of Significant Temporary Differences (Details) - CTRS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Income from unconsolidated joint ventures	$ 32	$ 27
Federal and state tax net operating loss carryforwards	696	702
Federal and state tax capital loss carryforwards	582	118
Other asset	104	0
Gross deferred tax asset	1,414	847
Other liability	0	(19)
Net deferred tax asset	1,414	828
Valuation allowance	(1,414)	(828)
Net deferred tax asset after valuation allowance	$ 0	$ 0

Deferred tax assets operating loss carryforwards federal and state.

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[Line Items] for Income Taxes [Table]

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from equity method investments.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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