QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Data (Unaudited)

The Company's common stock is traded on the New York Stock Exchange under the symbol "CWT."

2017	First		Second		Third		Fourth
Operating revenue	$	122,036	$	171,132	$	211,731	$	161,991
Net operating income	8,050		25,259		41,196		20,118
Net income	1,132		18,531		33,849		13,669
Diluted earnings per share	0.02		0.39		0.70		0.29
Common stock market price range:
High	37.60		39.40		39.65		46.15
Low	32.45		32.75		36.30		38.15
Dividends paid per common share	0.1800		0.1800		0.1800		0.1800

2016	First			Second		Third		Fourth
Operating revenue	$	121,727		$	152,445	$	184,268	$	150,930
Net operating income	6,270			18,534		30,055		21,335
Net income	(798		)	11,508		22,875		15,090
Diluted earnings (loss) per share	(0.02		)	0.24		0.48		0.31
Common stock market price range:
High	27.33			34.95		35.62		36.85
Low	22.48			26.22		29.93		29.25
Dividends paid per common share	0.1725			0.1725		0.1725		0.1725