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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income before noncontrolling interest $ 61,100 $ 52,839 $ 37,882
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 50,501 46,295 42,330
Deferred income taxes (436) 4,803 15,625
Share-based compensation 2,643 1,691 1,603
Gain on sale of Texas Water Alliance Limited and utility property (12,499) 0 0
Gain on sale of real estate investments (6,903) (10,419) (1,886)
Gain on sale of California Water Service Group stock 0 (3,197) 0
Changes in operating assets and liabilities:      
Accounts receivable and accrued unbilled utility revenue (1,702) (5,377) 735
Accounts payable and other current liabilities 2,888 (337) 1,550
Accrued groundwater extraction charges, purchased water and power 3,536 3,683 1,133
Tax receivable and accrued taxes 2,164 (680) (3,297)
Postretirement benefits (769) (349) (117)
Regulatory asset related to balancing and memorandum accounts (979) 19,297 1,429
Other noncurrent assets and noncurrent liabilities 741 5,468 1,950
Other changes, net 827 854 (783)
Net cash provided by operating activities 101,112 114,571 98,154
Investing activities:      
Company-funded (141,213) (129,134) (96,012)
Contributions in aid of construction (7,842) (13,086) (10,762)
Additions to real estate investment (116) (328) (1,097)
Payments for business/asset acquisition and water rights (1,149) (1,070) (991)
Cost to retire utility plant, net of salvage (3,356) (3,361) (3,673)
Proceeds from sale of Texas Water Alliance Limited and utility property 28,623 0 0
Proceeds from sale of real estate investments 11,179 20,341 1,925
Proceeds from sale of California Water Service Group stock 0 4,509 0
Net cash used in investing activities (113,874) (122,129) (110,610)
Financing activities:      
Borrowings from lines of credit 56,500 62,075 97,000
Repayments of lines of credit (45,700) (82,475) (75,600)
Long-term borrowings 0 50,999 0
Long-term borrowings held as restricted cash 0 19,001 0
Repayments of long-term borrowings (2,717) (16,599) (633)
Payment to noncontrolling interest (1,896) 0 0
Debt issuance costs 0 (1,275) 0
Dividends paid (21,332) (16,559) (15,885)
Receipts of advances and contributions in aid of construction 12,581 14,366 12,266
Refunds of advances for construction (2,622) (2,522) (2,484)
Other changes, net 397 658 632
Net cash (used) provided by financing activities (4,789) 27,669 15,296
Net change in cash, cash equivalents and restricted cash (17,551) 20,111 2,840
Cash and cash equivalents, beginning of year 25,350 5,239 2,399
Cash, cash equivalents and restricted cash, end of year 7,799 25,350 5,239
Cash paid during the year for:      
Interest 25,254 23,962 23,634
Income Taxes Paid, Net 34,052 27,517 9,723
Supplemental disclosure of non-cash activities:      
Increase (Decrease) in accrued payables for construction costs capitalized 2,273 3,696 7,540
Utility property installed by developers 3,723 9,614 1,011
Reconciliation to Consolidated Balance Sheets:      
Cash and cash equivalents 7,799 6,349 5,239
Restricted cash $ 0 $ 19,001 $ 0