Long-Term Water Assets - Revenues and Cost of Sales (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) acre ft	Dec. 31, 2018 USD ($) acre ft	Dec. 31, 2017 USD ($) acre ft
Goodwill and Intangible Assets Disclosure [Abstract]
Acre-Feet Sold (in acre-feet) | acre ft	4,482	9,442	939
Revenues	$ 3,997	$ 9,142	$ 1,254
Cost of sales	3,194	3,864	765
Profit	$ 803	$ 5,278	$ 489