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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2015
participant
Mar. 31, 2017
USD ($)
a
facility
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2013
acre ft
Loss Contingencies [Line Items]          
Payments on water contracts   $ 5,989,000      
Estimated future payments   $ 800,000      
Number of community facility districts | facility   2      
Letter of credit period   2 years      
Letter of credit renewal period   2 years      
Debt Issuance Costs, Net   $ 156,000   $ 161,000  
Special taxes paid       $ 2,585,000  
Tejon-Castac Water District | Kern Water Bank Authority          
Loss Contingencies [Line Items]          
Percentage of interest rate held   2.00%      
Antelope Valley Groundwater Cases | Settled Litigation          
Loss Contingencies [Line Items]          
Number of parties in agreement for settlement | participant 140        
Percentage of current water usage with the adjudication boundary (more than) 99.00%        
West CFD          
Loss Contingencies [Line Items]          
Acres of land related to land liens | a   420      
Bond debt sold by TRPFFA   $ 28,620,000      
Additional bond debt authorized to be sold in future   0      
Additional reimbursement funds   $ 0      
East CFD          
Loss Contingencies [Line Items]          
Acres of land related to land liens | a   1,931      
Bond debt sold by TRPFFA   $ 55,000,000      
Additional bond debt authorized to be sold in future   65,000,000      
Additional reimbursement funds   7,768,000      
Standby letter of credit          
Loss Contingencies [Line Items]          
Letters of credit outstanding amount   4,921,000      
Debt Issuance Costs, Net   $ 83,000      
DMB          
Loss Contingencies [Line Items]          
Contract renewal optional term   35 years     35 years
DMB | Transferable water          
Loss Contingencies [Line Items]          
Long-term water assets (volume) | acre ft         6,693
Forecast          
Loss Contingencies [Line Items]          
Payments on water contracts     $ 8,799,000