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Segment Reporting (Details) Assets and Liabilities (USD $)
3 Months Ended
Mar. 31, 2013
segment
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item      
Number of operating segments 5    
Number of reportable segments 5    
Assets $ 675,892,000   $ 667,174,000
Consolidated Assets and Liabilities [Abstract]      
Increase (decrease) in total assets 8,700,000    
Increase (decrease) in real estate and water assets 18,800,000    
Increase (decrease) in notes receivable and other assets 28,500,000    
Increase (decrease) in cash and cash equivalents (37,747,000) (15,149,000)  
Increase (decrease) in total liabilities 23,300,000    
Increase (decrease) in debt 17,800,000    
Net increase of mortgages 8,800,000    
Increase (decrease) in other liabilities 5,200,000    
Increase (decrease) in deferred revenue 6,800,000    
Water Resource and Water Storage Operations
     
Segment Reporting, Asset Reconciling Item      
Assets 209,865,000   210,189,000
Real Estate Operations
     
Segment Reporting, Asset Reconciling Item      
Assets 165,705,000   145,978,000
Segment Assets [Abstract]      
Increase (decrease) in operating assets 19,700,000    
Agribusiness Operations
     
Segment Reporting, Asset Reconciling Item      
Assets 167,787,000   165,961,000
Enterprise Software
     
Segment Reporting, Asset Reconciling Item      
Assets 22,793,000    
Corporate
     
Segment Reporting, Asset Reconciling Item      
Assets 109,742,000   145,046,000
Segment Assets [Abstract]      
Increase (decrease) in operating assets (35,300,000)    
Subsidiaries, Spigit
     
Consolidated Assets and Liabilities [Abstract]      
Increase (decrease) in notes receivable and other assets 21,400,000    
Increase in debt due to acquisition $ 8,000,000