Long Term Water Assets - Value of Water Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components of water assets
Total long-term assets	$ 46,700	$ 47,571
less: Current portion	(1,351)	(817)
Long-term water assets	45,349	46,754
Banked water and water for future delivery
Components of water assets
Total long-term assets	4,779	4,779
Transferable water
Components of water assets
Total long-term assets	9,309	8,988
SWP contracts
Components of water assets
Total long-term assets	32,612	33,804
Accumulated amortization	$ 4,188	$ 2,837