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Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 138,843 $ 132,341
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation 76,345 76,150
Regulatory debits 3,672 2,593
Amortization of deferred charges and credits 1,025 910
Allowance for equity funds used during construction (839) (749)
Changes in current assets and liabilities:    
Trade and other accounts receivable 2,590 4,632
Affiliated receivables (877) (224)
Exchange gas due from others 1,604 (594)
Materials and supplies 36 57
Other current assets (494) 645
Trade accounts payable (154) 394
Affiliated payables (2,794) (7,332)
Exchange gas due to others (1,603) 594
Other accrued liabilities 19,390 11,246
Changes in noncurrent assets and liabilities:    
Deferred charges (423) (5,024)
Noncurrent liabilities 692 9,269
Net cash provided by operating activities 237,013 224,908
Cash flows from financing activities:    
Payments of long-term debt (185,000) (175,000)
Proceeds from long-term debt 249,102 0
Paymenst for debt issuance costs (2,082) 0
Cash distributions to parent (148,000) (131,000)
Net cash used in financing activities (85,980) (306,000)
Property, plant and equipment:    
Capital expenditures, net of equity AFUDC (58,020) (51,115)
Contributions and advances for construction costs 440 1,134
Disposal of property, plant and equipment, net (934) 570
Advances to affiliates, net (92,519) 120,126
Proceeds from insurance 0 10,208
Net cash provided by (used in) investing activities (151,033) 80,923
NET INCREASE (DECREASE) IN CASH 0 (169)
CASH AT BEGINNING OF PERIOD 0 169
CASH AT END OF PERIOD 0  
Increases to property, plant and equipment (62,742) (48,188)
Changes in related in accounts payable and accrued liabilities 4,722 (2,927)
Capital expenditures, net of equity AFUDC $ (58,020) $ (51,115)