Segment Reporting - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Revenue Reconciling Item
Total revenue and other income	$ 205	$ 1,165	$ 35,032	$ 2,800
Income (loss) from continuing operations before income taxes	(2,817)	(5,099)	12,404	(14,473)
Water resource and water storage operations
Segment Reporting, Revenue Reconciling Item
Total revenue and other income	347	577	25,766	890
Income (loss) from continuing operations before income taxes	(965)	(1,004)	8,664	(4,186)
Corporate
Segment Reporting, Revenue Reconciling Item
Total revenue and other income	(142)	588	9,266	1,910
Income (loss) from continuing operations before income taxes	$ (1,852)	$ (4,095)	$ 3,740	$ (10,287)

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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