Reporting Segments and Related Information - Revenue Components of Farming Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Total revenues	$ 49,523	$ 45,619	$ 35,255
Total expenses	50,954	45,183	42,773
Operating results	(2,016)	1,721	(7,331)
Farming
Revenue from External Customer [Line Items]
Total revenues	19,331	18,563	16,434
Total expenses	15,251	16,028	16,201
Operating results	$ 4,080	$ 2,535	$ 233