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Statement of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES:      
Net income (loss) $ 131,461 $ (27,834) $ 180,455
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation 106,073 102,084 101,672
Regulatory debits 2,334 4,857 3,510
Regulatory charge resulting from tax rate change 35,680 206,547 0
Amortization of deferred charges and credits 954 2,687 898
Allowance for equity funds used during construction 1,703 1,104 953
Changes in current assets and liabilities:      
Trade and other accounts receivable (1,611) 1,798 845
Affiliated receivables 1,903 (600) 120
Materials and supplies 39 22 77
Other current assets 4,494 (687) 424
Trade accounts payable 1,753 271 (1,560)
Affiliated payables 15,234 4,005 (4,666)
Other accrued liabilities 881 1,856 (2,089)
Changes in noncurrent assets and liabilities:      
Deferred charges (8,392) 4,340 (7,275)
Regulatory liabilities 2,530 3,503 3,785
Noncurrent liabilities 3,498 (3,620) 9,025
Net cash provided by operating activities 295,128 298,125 284,268
FINANCING ACTIVITIES:      
Proceeds from long-term debt 246,395 249,102 0
Retirement of long-term debt (250,000) (185,000) (175,000)
Payments for debt issuance costs (2,498) (2,207) 0
Cash distributions to parent (174,000) (186,000) (174,000)
Net cash used in financing activities (180,103) (124,105) (349,000)
Property, plant and equipment:      
Capital expenditures, net of equity AFUDC (73,487) (81,217) (80,383)
Contributions and advances for construction costs 2,075 872 1,308
Disposal of property, plant and equipment, net (879) (1,146) (1,280)
Advances to affiliates, net (42,734) (92,529) 126,730
Proceeds from insurance 0 0 18,188
Net cash provided by (used in) investing activities (115,025) (174,020) 64,563
NET (DECREASE) INCREASE IN CASH 0 0 (169)
CASH AT BEGINNING OF PERIOD 0 0 169
CASH AT END OF PERIOD 0 0 0
Supplemental Cash Flow Elements [Abstract]      
Increases to property, plant and equipment (73,105) (80,355) (72,432)
Changes in related accounts receivable, accounts payable, and accrued liabilities (382) (862) (7,951)
Capital expenditures, net of equity AFUDC $ (73,487) $ (81,217) $ (80,383)