Reporting Segments and Related Information - Revenue Components of Farming Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Segment revenues	$ 35,657	$ 45,577	$ 51,147
Operating Segments
Revenue from External Customer [Line Items]
Segment revenues	35,657	45,577	51,147
Operating Segments | Farming segment
Revenue from External Customer [Line Items]
Segment revenues	16,434	18,648	23,836
Operating Segments | Farming segment | Almonds
Revenue from External Customer [Line Items]
Segment revenues	6,327	7,373	12,238
Operating Segments | Farming segment | Pistachios
Revenue from External Customer [Line Items]
Segment revenues	4,523	6,199	6,425
Operating Segments | Farming segment | Wine grapes
Revenue from External Customer [Line Items]
Segment revenues	4,131	3,744	4,338
Operating Segments | Farming segment | Hay
Revenue from External Customer [Line Items]
Segment revenues	456	520	749
Operating Segments | Farming segment | Total crop proceeds
Revenue from External Customer [Line Items]
Segment revenues	15,437	17,836	23,750
Operating Segments | Farming segment | Other farming revenues
Revenue from External Customer [Line Items]
Segment revenues	$ 997	$ 812	$ 86