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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows From Operating Activities:      
Net Income $ 60,484 $ 61,058 $ 62,686
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 42,674 41,751 40,967
Provision for doubtful accounts 870 991 1,145
Deferred income taxes and investment tax credits 10,423 32,316 16,112
Stock-based compensation expense 2,754 2,222 2,009
Other - net 838 0 (440)
Changes in assets and liabilities:      
Accounts receivable - customers (923) 3,979 (5,306)
Unbilled revenue 1,932 (2,870) (2,405)
Other accounts receivable 1,243 1,029 2,503
Receivables from the U.S. government 848 397 5,799
Materials and supplies (1,827) 970 790
Prepayments and other current assets 1,580 973 3,001
Costs and estimated earnings in excess of billings on uncompleted contracts (3,223) 6,159 (13,761)
Increase (Decrease) in Regulatory Assets and Liabilities (26,422) 26,385 11,667
Accounts payable 679 (1,622) 1,815
Income taxes receivable/payable 9,630 (11,648) 7,329
Billings in excess of costs and estimated earnings on uncompleted contracts (7,972) 4,884 (5,720)
Increase (Decrease) in Pension and Postretirement Obligations 616 (2,356) 4,396
Other liabilities 941 (1,348) 3,124
Net cash provided 95,145 163,270 135,711
Cash Flows From Investing Activities:      
Capital expenditures (87,323) (72,553) (97,379)
Payments to Acquire Investments (2,869) (1,568) (1,408)
Proceeds from Sale of Property, Plant, and Equipment 54 62 12
Net cash used (90,138) (74,059) (98,775)
Proceeds from Issuance of Common Shares and Stock Option Exercises 1,198 589 2,111
Cash Flows From Financing Activities:      
Payments for Repurchase of Common Stock (72,893) (17,180) 0
Tax benefits from exercise of stock-based awards 877 533 1,026
Receipt of advances for and contributions in aid of construction 3,731 7,598 12,133
Refunds on advances for construction (3,660) (3,469) (3,711)
Retirement or repayments of long-term debt (237) (21,287) (3,474)
Proceeds from issuance of long-term debt, net of issuance costs 0 14,846 60
Net change in notes payable to banks 28,000 0 0
Dividends paid (32,690) (32,111) (29,360)
Other (957) (968) (981)
Net cash provided (used) (76,631) (51,449) (22,196)
Net increase (decrease) in cash and cash equivalents (71,624) 37,762 14,740
Cash and cash equivalents, beginning of year 75,988 38,226 23,486
Cash and cash equivalents, end of year 4,364 75,988 38,226
GSWC      
Cash Flows From Operating Activities:      
Net Income 47,591 47,857 48,642
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 41,534 40,532 39,829
Provision for doubtful accounts 845 1,054 1,056
Deferred income taxes and investment tax credits 10,719 34,352 16,051
Stock-based compensation expense 2,443 1,748 1,647
Other - net 822 (12) (333)
Changes in assets and liabilities:      
Accounts receivable - customers (923) 3,979 (5,306)
Unbilled revenue (448) 819 (2,405)
Other accounts receivable 1,067 670 3,251
Materials and supplies (2,069) (932) 385
Prepayments and other current assets 440 583 4,992
Increase (Decrease) in Regulatory Assets and Liabilities (26,422) 26,386 11,667
Accounts payable 1,940 (1,676) 2,916
Inter-company receivable/payable 445 219 1,790
Income taxes receivable/payable from/to Parent 18,580 (19,876) 6,738
Increase (Decrease) in Pension and Postretirement Obligations 616 (2,356) 4,396
Other liabilities 358 (664) 2,854
Net cash provided 97,538 132,683 138,170
Cash Flows From Investing Activities:      
Capital expenditures (86,144) (70,888) (96,705)
Origination of Notes Receivable from Related Parties (20,700) (8,300) (18,236)
Repayment of Notes Receivable from Related Parties 20,700 8,800 17,736
Payments for (Proceeds from) Other Investing Activities (2,869) (1,568) (1,408)
Net cash used (89,013) (71,956) (98,613)
Cash Flows From Financing Activities:      
Tax benefits from exercise of stock-based awards 872 514 943
Receipt of advances for and contributions in aid of construction 3,731 7,598 12,133
Refunds on advances for construction (3,660) (3,469) (3,711)
Retirement or repayments of long-term debt (237) (21,287) (3,474)
Proceeds from issuance of long-term debt, net of issuance costs 0 14,846 60
Net change in inter-company borrowings 12,000 0 0
Dividends paid (62,000) (52,000) (29,400)
Other (735) (799) (811)
Net cash provided (used) (50,029) (54,597) (24,260)
Net increase (decrease) in cash and cash equivalents (41,504) 6,130 15,297
Cash and cash equivalents, beginning of year 44,005 37,875 22,578
Cash and cash equivalents, end of year $ 2,501 $ 44,005 $ 37,875