Real Estate Assets - Assets held for sale (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Real Estate Assets
Real estate assets held for sale, net	$ 6,380	$ 6,802
Reduction in real estate held for sale, net	771
Value of real estate assets reclassified as held for sale	349
Land
Real Estate Assets
Real estate assets held for sale, net	522	505
Land improvements
Real Estate Assets
Real estate assets held for sale, net	269	269
Development costs
Real Estate Assets
Real estate assets held for sale, net	$ 5,589	$ 6,028