Reporting Segments and Related Information - Revenue Components of Farming Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from External Customer [Line Items]
Total expenses	$ 12,125	$ 12,717	$ 34,160	$ 32,060
Operating results	(2,155)	3,050	(3,856)	2,851
Farming
Revenue from External Customer [Line Items]
Total revenues	4,602	10,836	6,303	12,573
Total expenses	5,979	6,541	8,402	9,570
Operating results	$ (1,377)	$ 4,295	$ (2,099)	$ 3,003