Long-Term Water Assets - Tangible Water Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long Lived Assets Held-for-sale [Line Items]
Total water held for future use at cost	$ 31,302	$ 28,319
Banked water and water for future delivery
Long Lived Assets Held-for-sale [Line Items]
Total water held for future use at cost	28,091	25,265
Transferable water
Long Lived Assets Held-for-sale [Line Items]
Total water held for future use at cost	$ 3,211	$ 3,054