Reporting Segments and Related Information - Revenue Components of Farming Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Total expenses	$ 10,341	$ 7,419	$ 22,035	$ 19,343
Operating results	(1,044)	(2,013)	(1,701)	(199)
Farming
Revenue from External Customer [Line Items]
Total revenues	886	542	1,701	1,737
Total expenses	825	1,191	2,423	3,029
Operating results	$ 61	$ (649)	$ (722)	$ (1,292)