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Statement of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING ACTIVITIES:      
Net income (loss) $ 142,667 $ 131,461 $ (27,834)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 107,951 106,073 102,084
Regulatory debits 1,107 2,334 4,857
Regulatory charges resulting from tax rate changes 23,580 35,680 206,547
Amortization of deferred charges and credits (2,806) 954 2,687
Allowance for equity funds used during construction (equity AFUDC) (2,744) (1,703) (1,104)
Changes in current assets and liabilities:      
Trade and other accounts receivable (1,528) (1,611) 1,798
Affiliated receivables (91) 1,903 (600)
Materials and supplies 363 39 22
Other current assets 4,311 4,494 (687)
Trade accounts payable (1,497) 1,753 271
Affiliated payables (17,360) 15,234 4,005
Other accrued liabilities (8,056) 881 1,856
Changes in noncurrent assets and liabilities:      
Regulatory liabilities 3,493 2,530 3,503
Other, net 8,570 (4,894) 720
Net cash provided by operating activities 257,960 295,128 298,125
FINANCING ACTIVITIES:      
Proceeds from long-term debt 0 246,395 249,102
Retirement of long-term debt 0 (250,000) (185,000)
Payments for debt issuance costs (59) (2,498) (2,207)
Cash distributions to parent (110,000) (174,000) (186,000)
Net cash used in financing activities (110,059) (180,103) (124,105)
Property, plant and equipment:      
Capital expenditures (128,440) (73,487) (81,217)
Contributions and advances for construction costs 4,805 2,075 872
Disposal of property, plant and equipment, net (3,401) (879) (1,146)
Advances to affiliates, net (20,865) (42,734) (92,529)
Net cash used in investing activities (147,901) (115,025) (174,020)
NET (DECREASE) INCREASE IN CASH 0 0 0
CASH AT BEGINNING OF PERIOD 0 0 0
CASH AT END OF PERIOD 0 0 0
Supplemental Cash Flow Elements [Abstract]      
Increases to property, plant and equipment, exclusive of equity AFUDC (132,260) (73,105) (80,355)
Changes in related accounts receivable, accounts payable, and accrued liabilities 3,820 (382) (862)
Capital expenditures $ (128,440) $ (73,487) $ (81,217)