Long-Term Water Assets - Volume of Water Assets (Details) - acre ft acre ft in Thousands	Jun. 30, 2020	Dec. 31, 2019
Banked water and water for future delivery
Water contracts and purchased water	10,137	10,137
Total purchased water contracts	92,487	91,988
Total purchased and contracted water sources in acre feet	149,108	145,589
Water held for future use
Banked water and water for future delivery
Company water bank	50,349	50,349
Transferable water	6,272	3,252
Banked water and water for future delivery	56,621	53,601
WRMWSD - Contracts with the Company
Banked water and water for future delivery
Water contracts and purchased water	15,547	15,547
Tejon-Castac Water District
Banked water and water for future delivery
Banked water and water for future delivery	61,054	60,555
Water contracts and purchased water	5,749	5,749