Segment Reporting (Details) Segment Information by Major Operating Segment - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 362,578	$ 266,663	$ 192,488
Interest			228
Impairment loss on intangible and long-lived assets	7,012	3,282	13,084
Depreciation and amortization	1,496	2,212	3,054
Income (loss) from continuing operations before income taxes and equity in loss of unconsolidated affiliate	(18,003)	(31,150)	(46,969)
Equity in loss of unconsolidated affiliate		(3,422)	(2,076)
Total assets	675,794	662,085	802,132
Capital expenditure	318	3,108	5,270
Water Resources and Water Storage Operations
Segment Reporting Information [Line Items]
Total revenues	952	4,332	1,580
Interest			18
Impairment loss on intangible and long-lived assets		269	5,791
Depreciation and amortization	355	1,037	1,098
Income (loss) from continuing operations before income taxes and equity in loss of unconsolidated affiliate	(5,476)	(3,858)	(12,584)
Total assets	185,303	185,037	186,294
Capital expenditure	29	76	230
Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	354,745	279,196	191,440
Impairment loss on intangible and long-lived assets	6,811	1,197	2,865
Depreciation and amortization	631	552	669
Income (loss) from continuing operations before income taxes and equity in loss of unconsolidated affiliate	8,064	6,394	(10,531)
Total assets	434,936	421,411	382,543
Capital expenditure	166	330	1,004
Corporate
Segment Reporting Information [Line Items]
Total revenues	6,881	(16,865)	(532)
Interest			210
Impairment loss on intangible and long-lived assets	201	1,816	4,428
Depreciation and amortization	510	623	1,287
Income (loss) from continuing operations before income taxes and equity in loss of unconsolidated affiliate	(20,591)	(33,686)	(23,854)
Equity in loss of unconsolidated affiliate		(3,422)	(2,076)
Total assets	49,050	46,844	80,741
Capital expenditure	123	2,702	4,036
Discontinued Agribusiness Operations
Segment Reporting Information [Line Items]
Total assets	$ 6,505	$ 8,793	$ 152,554