Long-Term Water Assets - Value of Water Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Components of water assets
Total long-term assets	$ 45,813	$ 45,157
less: Current portion	(1,351)	(1,351)
Long-term water assets	44,462	43,806
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	10,110	9,117
SWP contracts
Components of water assets
Total long-term assets	$ 30,924	$ 31,261