Commitments (Details 3) (GSWC, USD $)	12 Months Ended			36 Months Ended	59 Months Ended
	Dec. 31, 2013 MW	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Nov. 30, 2013
Water Purchase Commitments [Member]
Purchase commitments
Optional renewal term	10 years
Total commitment under agreement	$ 5,626,000
Bear Valley Electric
Purchase commitments
Average load at customer service area (in MWs)	11
Average winter load (in MWs)	20
Winter peak load (in MWs)	45
Maximum capacity fo natural gas-fuled generation facility (in megawatts)	8.4
Bear Valley Electric | Shell
Purchase commitments
Megawatts of electric energy provided under contract	13
Fixed price of electric energy per MWh				66.40	67.15
Purchase of power under the shell contract	$ 7,100,000	$ 7,800,000	$ 9,000,000
Bear Valley Electric | EDF
Purchase commitments
Megawatts of electric energy provided under contract	12