Summary of Significant Accounting Policies - Vineyards and Orchards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Farming revenue adjustments for differences between original estimates and actual revenues received	$ 1,804	$ 734	$ 3,531
Almonds
Revenue from External Customer [Line Items]
Farming revenue adjustments for differences between original estimates and actual revenues received	352	653	1,260
Pistachios
Revenue from External Customer [Line Items]
Farming revenue adjustments for differences between original estimates and actual revenues received	$ 1,452	$ 81	$ 2,271