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Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
OPERATING ACTIVITIES:      
Net income $ 172,987 $ 136,723 $ 152,813
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation 96,109 93,419 90,486
Regulatory debits (credits) 921 (494) (1,023)
Loss on sale of property, plant and equipment 0 0 6
Amortization of deferred charges and credits 1,720 1,578 1,491
Allowance for equity funds used during construction (945) (1,564) (1,438)
Changes in current assets and liabilities:      
Trade and other accounts receivable 2,133 (8,291) 270
Affiliated receivables (38,744) 567 (132)
Exchange gas due from others 153 (1,262) 402
Materials and supplies (132) 351 1,231
Other current assets (202) 116 (54)
Trade accounts payable (212) 6,305 (597)
Affiliated payables 224 2,100 (1,462)
Exchange gas due to others (153) 1,262 (402)
Other accrued liabilities 3,885 169 827
Changes in noncurrent assets and liabilities:      
Deferred charges (7,448) (4,015) (2,829)
Noncurrent liabilities 9,819 5,442 4,769
Net cash provided by operating activities 240,115 232,406 244,358
FINANCING ACTIVITIES:      
Capital contributions from parent 13,300 8,630 5,100
Cash distributions to parent (91,000) (137,500) (127,000)
Other (1,318) 329 657
Net cash used in financing activities (79,018) (128,541) (121,243)
Property, plant and equipment:      
Capital expenditures, net of equity AFUDC (76,991) (134,330) (115,111)
Proceeds from sales 5,756 7,843 (993)
Repayments from (advances to) affiliates, net (89,846) 22,702 (6,979)
Net cash used in investing activities (161,081) (103,785) (123,083)
NET (DECREASE) INCREASE IN CASH 16 80 32
CASH AT BEGINNING OF PERIOD 117 37 5
CASH AT END OF PERIOD 133 117 37
Supplemental Cash Flow Elements [Abstract]      
Increases to property, plant and equipment (84,151) (132,445) (115,677)
Changes in related accounts payable and accrued liabilities 7,160 (1,885) 566
Capital expenditures, net of equity AFUDC $ (76,991) $ (134,330) $ (115,111)