Reporting Segments and Related Information - Revenue Components of Farming Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Total revenues	$ 13,513	$ 9,657	$ 28,601	$ 29,265
Total expenses	14,340	12,125	33,974	34,160
Operating results	(306)	(2,155)	(3,144)	(3,856)
Farming
Revenue from External Customer [Line Items]
Total revenues	8,537	4,602	9,698	6,303
Total expenses	8,108	5,979	10,909	8,402
Operating results	$ 429	$ (1,377)	$ (1,211)	$ (2,099)