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Basis of Presentation and Summary of Significant Accounting Policies - Real Estate and Water Assets, Impairment Losses (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Real Estate Improvements
Minimum
Sep. 30, 2014
Real Estate Improvements
Maximum
Real Estate Properties [Line Items]        
Estimated useful lives (length of time)     5 years 15 years
Real estate held-for-sale $ 31,100,000 $ 8,600,000    
Real estate 291,446,000 208,506,000    
Tangible water assets 45,761,000 45,702,000    
Real estate and water assets, net $ 337,207,000 $ 254,208,000