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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows From Operating Activities: |  |  |
Net Income | $ 84,342 | $ 63,871 | $ 69,367
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 35,713 | 40,663 | 39,273
Provision for doubtful accounts | 608 | 841 | 989
Deferred income taxes and investment tax credits | 6,623 | (5,773) | 12,153
Stock-based compensation expense | 2,517 | 3,851 | 2,885
Gain on sale of assets | (253) | (85) | (8,318)
(Gain) loss on investments held in a trust | (3,580) | 558 | (1,743)
Other - net | 526 | 97 | 218
Changes in assets and liabilities: |  |  |
Accounts receivable - customers | 1,882 | 1,882 | (7,671)
Unbilled revenue-receivable | (5,515) | 2,823 | (2,020)
Other accounts receivable | 214 | 5,151 | (1,671)
Receivable from the U.S. government | (1,144) | 20,976 | (4,742)
Materials and supplies | (654) | (980) | (501)
Prepayments and other assets | 3,978 | (519) | (1,641)
Contract Assets | 3,979 | 5,941 | 0
Costs and estimated earnings in excess of billings on contracts | 0 | 0 | 2,881
Regulatory Assets / Liabilities | (11,597) | 33,834 | 24,626
Accounts payable | (249) | 1,282 | 4,358
Income taxes receivable / payable | (3,786) | 2,708 | 13,206
Contract liabilities/ Billings in excess of cost of estimated earnings | 3,637 | 3,619 | 1,648
Accrued pension and other post-retirement benefits | 1,994 | (1,086) | (878)
Other liabilities | (4,659) | (928) | (1,589)
Cash Flows From Operating Activities | 116,864 | 136,774 | 144,552
Cash Flows From Investing Activities: |  |  |
Capital expenditures | (151,940) | (126,561) | (113,126)
Proceeds from sale of assets | 169 | 72 | 34,324
Other investments | 1,424 | 1,553 | 1,229
Net Cash Provided by (Used in) Investing Activities | (153,195) | (128,042) | (80,031)
Cash Flows From Financing Activities: |  |  |
Proceeds from stock option exercises | 519 | 546 | 909
Receipt of advances for and contributions in aid of construction | 10,171 | 5,551 | 7,275
Refunds on advances for construction | 5,005 | 3,886 | 3,889
Retirement or repayments of long-term debt | (40,325) | (326) | (329)
Increase (Decrease) in Notes Payable, Current | 109,500 | 36,500 | (31,000)
Dividends paid | (42,702) | (38,937) | (36,417)
Other | (1,634) | (1,253) | (1,292)
Net Cash Provided by (Used in) Financing Activities | 30,524 | (1,805) | (64,743)
Net change in cash and cash equivalents | (5,807) | 6,927 | (222)
Cash and cash equivalents, beginning of period | 7,141 | 214 | 436
Cash and cash equivalents, end of year | 1,334 | 7,141 | 214
GSWC |  |  |
Cash Flows From Operating Activities: |  |  |
Net Income | 66,663 | 48,012 | 53,757
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 32,757 | 38,633 | 38,094
Provision for doubtful accounts | 606 | 850 | 816
Deferred income taxes and investment tax credits | 5,081 | (6,817) | 13,970
Stock-based compensation expense | 2,253 | 3,397 | 2,420
Gain on sale of assets | (88) | (8) | (8,318)
(Gain) loss on investments held in a trust | (3,580) | 558 | (1,743)
Other - net | 58 | 27 | 130
Changes in assets and liabilities: |  |  |
Accounts receivable - customers | 1,882 | 1,882 | (7,671)
Unbilled revenue-receivable | (744) | 960 | (1,152)
Other accounts receivable | 311 | 4,140 | (544)
Materials and supplies | (123) | (751) | (322)
Prepayments and other assets | 4,230 | (154) | (1,450)
Regulatory Assets / Liabilities | (11,597) | 33,834 | 24,626
Accounts payable | 1,558 | (1,907) | 4,927
Inter-company receivable / payable | 1,056 | (47) | (390)
Income taxes receivable / payable | (2,110) | 973 | 15,266
Accrued pension and other post-retirement benefits | 1,994 | (1,086) | (878)
Other liabilities | (3,579) | (2,057) | (1,930)
Cash Flows From Operating Activities | 96,628 | 120,439 | 129,608
Cash Flows From Investing Activities: |  |  |
Capital expenditures | (142,852) | (116,354) | (110,487)
Proceeds from sale of assets | 88 | 9 | 34,324
Payments to Acquire Investments | 1,424 | 1,553 | 1,229
Net Cash Provided by (Used in) Investing Activities | (144,188) | (117,898) | (77,392)
Cash Flows From Financing Activities: |  |  |
Proceeds from issuance of Common Shares to Parent | 0 | 47,500 | 0
Receipt of advances for and contributions in aid of construction | 10,171 | 5,551 | 7,275
Refunds on advances for construction | 5,005 | 3,886 | 3,889
Retirement or repayments of long-term debt | (40,325) | (326) | (329)
Net change in inter-company borrowings | (100,500) | (22,500) | 26,500
Dividends paid | (20,200) | (68,850) | (27,680)
Other | (1,367) | (1,057) | (1,088)
Net Cash Provided by (Used in) Financing Activities | 43,774 | 1,432 | (52,211)
Net change in cash and cash equivalents | (3,786) | 3,973 | 5
Cash and cash equivalents, beginning of period | 4,187 | 214 | 209
Cash and cash equivalents, end of year | $ 401 | $ 4,187 | $ 214

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