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Summary of Significant Accounting Policies - Vineyards and Orchards (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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