Goodwill & Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	$ 1,741		$ 1,741		$ 1,741
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	25,384		25,384		25,384
Accumulated Amortization	(15,399)		(15,399)		(14,571)
Net Amount	9,985		9,985		10,813
Total intangible assets, Gross Amount	27,125		27,125		27,125
Total intangible assets, Net Amount	11,726		11,726		12,554
Amortization of intangible assets	600	$ 0	800	$ 0
Acquired ICFAs
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	17,978		17,978		17,978
Accumulated Amortization	(13,396)		(13,396)		(12,568)
Net Amount	4,582		4,582		5,410
Sonoran contract rights
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	7,406		7,406		7,406
Accumulated Amortization	(2,003)		(2,003)		(2,003)
Net Amount	5,403		5,403		5,403
CP Water Certificate of Convenience & Necessity service area
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	1,532		1,532		1,532
Intangible trademark
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	13		13		13
Franchise Rights [Member]
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	129		129		129
Red Rock Utilities [Member]
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	$ 67		$ 67		$ 67