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Earnings (Loss) Per Share of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 38,076		$ 5,281		$ 35,044	$ (15,026)
Loss attributable to noncontrolling interests	149		0		149	0
Net income attributable to California Water Service Group	$ 38,225	$ (3,032)	$ 5,281	$ (20,307)	35,193	(15,026)
Net income (loss) attributable to California Water Service Group					$ 35,193	$ (15,026)
Weighted average common shares outstanding, basic (in shares)	51,080		48,936		50,762	48,759
Weighed average common shares outstanding, dilutive (in shares)	51,080		48,936		50,762	48,759
Earnings per share - basic (in dollars per share)	$ 0.75		$ 0.11		$ 0.69	$ (0.31)
Earnings per share - diluted (in dollars per share)	$ 0.75		$ 0.11		$ 0.69	$ (0.31)

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