Long Term Water Assets (Volume of Water Assets) (Details)	Jun. 30, 2013 acre_foot	Dec. 31, 2012 acre_foot
Banked water and water for future delivery
Company water bank	8,818	8,700
Total Company and AVEK banked water	24,218	22,540
Transferable water with AVEK	14,786	14,786
Total purchased water - third parties	42,448	40,770
Total purchased and contracted water sources in acre feet	102,417	100,739
AVEK
Banked water and water for future delivery
AVEK water bank	13,038	11,478
AVEK water for future delivery	2,362	2,362
SWP Contracts
Banked water and water for future delivery
SWP and TCWD contracts	3,444	3,444
WRMWSD
Banked water and water for future delivery
SWP and TCWD contracts	15,547	15,547
TCWD
Banked water and water for future delivery
Total Company and AVEK banked water	38,943	38,943
SWP and TCWD contracts	5,479	5,479