Long-Term Water Assets - Volume of Water Assets (Details) - acre ft acre ft in Thousands	Sep. 30, 2019	Dec. 31, 2018
Banked water and water for future delivery
Water contracts and purchased water	10,137	10,137
Total purchased water contracts	92,310	83,980
Total purchased and contracted water sources in acre feet	145,563	133,306
Water held for future use
Banked water and water for future delivery
Company water bank	50,349	48,826
Transferable water	2,904	500
Banked water and water for future delivery	53,253	49,326
WRMWSD - Contracts with 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	60,877	52,547
Water contracts and purchased water	5,749	5,749