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Statement of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
OPERATING ACTIVITIES:    
Net income $ 85,663 $ 70,194
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation 47,740 46,535
Regulatory debits (credits) 350 (404)
Amortization of deferred charges and credits 830 795
Allowance for equity funds used during construction (436) (719)
Changes in current assets and liabilities:    
Trade and other accounts receivable 595 2,098
Affiliated receivables (570) 2,250
Exchange gas due from others 3,647 2,296
Materials and supplies (183) 439
Other current assets (990) (978)
Trade accounts payable (2,686) (2,465)
Affiliated payables (749) 4,695
Exchange gas due to others (3,647) (2,295)
Other accrued liabilities 1,974 303
Changes in noncurrent assets and liabilities:    
Deferred charges (3,434) (954)
Noncurrent liabilities 4,193 2,639
Net cash provided by operating activities 132,297 124,429
FINANCING ACTIVITIES:    
Capital contributions from parent 0 2,330
Distributions paid (27,000) (73,000)
Other (2,194) (1,719)
Net cash used in financing activities (29,194) (72,389)
Property, plant and equipment:    
Capital expenditures (21,898) (47,147)
Proceeds from sales 1,651 4,748
Advances to affiliates (82,873) (9,438)
Net cash used in investing activities (103,120) (51,837)
NET (DECREASE) INCREASE IN CASH (17) 203
CASH AT BEGINNING OF PERIOD 117 37
CASH AT END OF PERIOD $ 100 $ 240