Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income before noncontrolling interest	$ 23,627	$ 38,767	$ 61,100
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68,489	56,907	50,501
Deferred income taxes	(1,249)	(9,486)	(436)
Share-based compensation	3,406	2,117	2,643
Unrealized loss on California Water Service Group stock	0	527	0
Gain on sale of California Water Service Group stock	0	(104)	0
Gain on sale of real estate investments	(929)	0	(6,903)
Loss (gain) on sale of utility property	20	(9)	(12,499)
Changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable and accrued unbilled utility revenue	(3,860)	(2,003)	(1,702)
Accounts payable and other current liabilities	1,946	2,130	2,888
Accrued groundwater extraction charges, purchased water and power	2,853	(688)	3,536
Tax receivable and accrued taxes	(6,044)	5,841	2,164
Postretirement benefits	(4,000)	203	(769)
Regulatory asset related to balancing and memorandum accounts	30,838	(6,488)	(979)
Other noncurrent assets and noncurrent liabilities	7,439	1,923	741
Other changes, net	7,469	1,706	827
Net cash provided by operating activities	130,005	91,343	101,112
Investing activities:
Company-funded	(164,325)	(135,973)	(141,213)
Contributions in aid of construction	(13,563)	(8,454)	(7,842)
Additions to real estate investment	(137)	(123)	(116)
Payments for business/asset acquisition and water rights	(835,465)	(2,496)	(1,149)
Cost to retire utility plant, net of salvage	(5,026)	(3,909)	(3,356)
Proceeds from sale of California Water Service Group stock	0	4,112	0
Proceeds from sale of real estate investments and utility property	745	0	39,802
Net cash used in investing activities	(1,017,771)	(146,843)	(113,874)
Financing activities:
Borrowings from lines of credit	105,349	76,000	56,500
Repayments of lines of credit	(192,055)	(1,000)	(45,700)
Long-term borrowings	590,000	0	0
Long-term borrowings held as restricted cash	5,000	0	0
Repayments of long-term borrowings	(1,400)	0	(2,717)
Payments of Debt Issuance Costs	(4,918)	0	0
Dividends paid	(34,134)	(23,074)	(21,332)
Receipts of advances and contributions in aid of construction	18,904	10,890	12,581
Refunds of advances for construction	(2,911)	(2,700)	(2,622)
Issuance of common stock, net of issuance costs	(10)	411,385	0
Other changes, net	1,163	(3,078)	(1,499)
Net cash provided by (used in) financing activities	484,988	468,423	(4,789)
Net change in cash, cash equivalents and restricted cash	(402,778)	412,923	(17,551)
Cash and cash equivalents, beginning of year	420,722	7,799	25,350
Cash, cash equivalents and restricted cash, end of year	17,944	420,722	7,799
Cash paid during the year for:
Interest	32,138	27,038	25,254
Income taxes	16,448	13,750	34,052
Supplemental disclosure of non-cash activities:
Increase (Decrease) in accrued payables for construction costs capitalized	(516)	340	2,700
Utility property installed by developers	3,077	1,747	3,723
Reconciliation to Consolidated Balance Sheets:
Cash, cash equivalents and restricted cash, end of year	$ 420,722	$ 420,722	$ 25,350