Reporting Segments and Related Information - Revenue Components of Farming Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Total revenues	$ 37,830	$ 49,523	$ 45,619
Total expenses	44,577	50,954	45,183
Operating results	(4,422)	(2,016)	1,721
Farming
Revenue from External Customer [Line Items]
Total revenues	13,866	19,331	18,563
Total expenses	15,103	15,251	16,028
Operating results	$ (1,237)	$ 4,080	$ 2,535