Long Term Water Assets - Volume of Water Assets (Details)	Dec. 31, 2015 a aft acre_foot	Dec. 31, 2014 aft	Dec. 31, 2009 aft	Dec. 31, 2008 aft
Banked water and water for future delivery
Water Contracts	10,137	10,137
Total purchased water - third parties	49,018	49,461
Total purchased and contracted water sources in acre feet	104,810	109,158
AVEK
Banked water and water for future delivery
AVEK water bank	13,033	13,033	6,393	8,393
Company water bank	8,700	8,700
AVEK water for future delivery	2,362	2,362
Banked water and water for future delivery	24,095	24,095
Transferable water	14,786	15,229
Total purchased water - third parties | acre_foot	14,786
Wheeler Ridge Maricopa Water Storage District
Banked water and water for future delivery
Water Contracts	15,547	15,547
Tejon-Castac Water District
Banked water and water for future delivery
Banked water and water for future delivery	34,496	38,401
Water Contracts	5,749	5,749
Transferable water | AVEK
Banked water and water for future delivery
Total purchased water - third parties | a	22,179
Transferable water factor	1.5