Segment Reporting (Details) Assets and Liabilities (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 segment	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item
Number of operating segments	5
Number of reportable segments	5
Assets	$ 662,785	$ 667,174
Water Resource and Water Storage Operations
Segment Reporting, Asset Reconciling Item
Assets	214,363	210,189
Real Estate Operations
Segment Reporting, Asset Reconciling Item
Assets	161,452	145,978
Agribusiness Operations
Segment Reporting, Asset Reconciling Item
Assets	161,788	165,961
Enterprise Software
Segment Reporting, Asset Reconciling Item
Assets	24,146
Corporate
Segment Reporting, Asset Reconciling Item
Assets	$ 101,036	$ 145,046