Long Term Water Assets - Value of Water Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Components of water assets
Total long-term assets	$ 43,764	$ 45,157
less: Current portion	(1,351)	(1,351)
Long-term water assets	42,413	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	9,075	9,117
Water Contracts
Components of water assets
Total long-term assets	$ 29,910	$ 31,261