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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Net income $ 79,416 $ 69,135 $ 74,636
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 112,750 99,824 92,656
Deferred income taxes 45,557 37,368 45,833
Amortization of investment tax credits (523) (523) (528)
Allowance for equity funds used during construction (6,707) (4,277) (7,253)
Loss on Monticello life cycle management/extended power uprate project 0 0 5,237
Provision for bad debts 4,105 3,730 3,947
Net derivative losses 128 160 482
Other (1,823) (623) 0
Changes in operating assets and liabilities:      
Accounts receivable (9,948) (1,383) 71
Accrued unbilled revenues (6,370) (5,940) 5,869
Inventories 552 3,250 3,126
Other current assets 922 (1,191) 7,135
Accounts payable 9,025 10,632 (7,626)
Net regulatory assets and liabilities (31,223) (18,601) (27,114)
Other current liabilities (2,215) 14,036 5,147
Pension and other employee benefit obligations (8,558) (6,197) (3,177)
Change in other noncurrent assets 583 (718) 209
Change in other noncurrent liabilities (5,934) 2,050 716
Net cash provided by operating activities 179,737 200,732 199,366
Investing activities      
Utility capital/construction expenditures (218,801) (204,427) (251,797)
Allowance for equity funds used during construction 6,707 4,277 7,253
Other, net (49) 1,198 (224)
Net cash used in investing activities (212,143) (198,952) (244,768)
Financing activities      
(Repayments of) proceeds from short-term borrowings, net (49,000) 50,000 (68,000)
Proceeds from issuance of long-term debt 97,455 0 97,969
Repayments of long-term debt (77) (93) (87)
Capital contributions from parent 47,992 1,935 69,243
Dividends paid to parent (64,037) (53,100) (53,929)
Other, net (70) (55) 0
Net cash provided by (used in) financing activities 32,263 (1,313) 45,196
Net change in cash and cash equivalents (143) 467 (206)
Cash and cash equivalents at beginning of period 1,546 1,079 1,285
Cash and cash equivalents at end of period 1,403 1,546 1,079
Supplemental disclosure of cash flow information:      
Cash paid for interest (net of amounts capitalized) (30,907) (30,878) (27,491)
Cash (paid) received for income taxes, net (5,046) 5,873 5,762
Supplemental disclosure of non-cash investing transactions:      
Property, plant and equipment additions in accounts payable $ 27,753 $ 16,172 $ 16,729