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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2015
participant
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
a
facility
acre ft
Jun. 30, 2014
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 07, 2017
a
Dec. 31, 2013
acre ft
Loss Contingencies [Line Items]                
Amount paid for water contracts     $ 6,124,000          
Contract renewal optional term     35 years          
Estimated future payments     $ 800,000          
Incentive fee on contract termination, measurement period from entitlement achievement date       5 years        
Number of community facility districts | facility     2          
Acres of land related to land liens | a             190  
Letter of credit period     2 years          
Letter of credit renewal period     2 years          
Annual cost related to the letter of credit     $ 134,000     $ 139,000    
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     6,383,000          
Standby letter of credit                
Loss Contingencies [Line Items]                
Letters of credit outstanding amount     4,921,000          
Annual cost related to the letter of credit     $ 83,000          
DMB                
Loss Contingencies [Line Items]                
Contract renewal optional term     35 years          
DMB | Transferable water                
Loss Contingencies [Line Items]                
Long-term water assets (volume) | acre ft     6,693         6,693
Scenario, Forecast                
Loss Contingencies [Line Items]                
Amount paid for water contracts         $ 8,889,000      
Special taxes paid   $ 1,258,000     $ 2,570,000