Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Basis difference - investment in partnerships	$ 27,394	$ 40,626
Disallowed interest expense carry forwards	524	524
Net operating and capital loss carry forwards	3,249	9,910
Other	0	746
Gross deferred tax asset	31,167	51,806
Valuation allowance	(29,212)	(49,244)
Deferred tax assets, net of valuation allowance	1,955	2,562
Deferred tax liabilities
Basis difference - real estate	(31,282)	(31,463)
Other	(201)	0
Gross deferred tax liabilities	(31,483)	(31,463)
Net deferred tax liability	(29,528)	(28,901)
Deferred tax asset was recognized on net operating losses	$ 6,900	$ 27,100