Goodwill & Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	$ 1,741	$ 1,745
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	25,384	25,384
Accumulated Amortization	(14,571)	(14,157)
Net Amount	10,813	11,227
Total intangible assets, Gross Amount	27,125	27,129
Total intangible assets, Net Amount	12,554	12,972
Acquired ICFAs
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	17,978	17,978
Accumulated Amortization	(12,568)	(12,154)
Net Amount	5,410	5,824
Sonoran contract rights
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	7,406	7,406
Accumulated Amortization	(2,003)	(2,003)
Net Amount	5,403	5,403
CP Water Certificate of Convenience & Necessity service area
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	1,532	1,532
Intangible trademark
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	13	13
Franchise Rights [Member]
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	129	134
Red Rock Utilities [Member]
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	$ 67	$ 66