Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 422,884us-gaap_NetIncomeLoss	$ 374,026us-gaap_NetIncomeLoss	$ 272,466us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	269,395	263,949	266,981
Allowance for equity funds used during construction (equity AFUDC)	(18,701)	(13,299)	(13,222)
Changes in operating assets and liabilities:
Receivables - affiliates	1,947	55	3,247
Receivables - trade and other	17,437	(21,772)	(4,186)
Transportation and exchange gas receivable	3,272	(3,881)	2,038
Regulatory assets - current	(40,290)	28,536	1,171
Regulatory assets - non-current	17,532	21,910	(5,980)
Inventories	(19,167)us-gaap_IncreaseDecreaseInInventories	232us-gaap_IncreaseDecreaseInInventories	673us-gaap_IncreaseDecreaseInInventories
Payables - affiliates	9,420	(3,738)	15,069
Payables - trade	32,618	(26,463)	3,727
Accrued liabilities	(39,450)	28,322	8,256
Asset retirement obligations - non-current	30,840	13,105	35,195
Asset retirement obligation - removal costs	(12,824)us-gaap_PaymentsForRemovalCosts	(26,919)us-gaap_PaymentsForRemovalCosts	(41,052)us-gaap_PaymentsForRemovalCosts
Reserve for rate refunds	(98,217)	98,217	0
Other, net	7,954	10,731	(2,934)
Net cash provided by operating activities	584,650	743,011	541,449
Cash flows from financing activities:
Additions to long-term debt	0	0	398,804
Retirement of long-term debt	0us-gaap_MaturitiesOfSeniorDebt	0us-gaap_MaturitiesOfSeniorDebt	(325,000)us-gaap_MaturitiesOfSeniorDebt
Debt issue costs	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(4,403)us-gaap_PaymentsOfDebtIssuanceCosts
Cash distributions to parent	(411,000)	(250,000)	(246,259)
Cash contributions from parent	267,000	264,000	150,000
Other, net	22,329	(3,034)	(3,333)
Net cash provided by (used in) financing activities	(121,671)	10,966	(30,191)
Cash flows from investing activities:
Property, plant and equipment additions, net of equity AFUDC	(724,163)	(557,366)	(507,884)
Contributions and Advances for Construction Costs	57,817	30,450	32,434
Disposal of property, plant and equipment, net	(7,532)	(3,621)	7,157
Advances to affiliate, net	219,470	(214,215)	(58,554)
Return of capital from unconsolidated affiliates	2,333	1,438	11,327
Contributions to unconsolidated affiliates	0	0	(5,806)
Purchase of ARO Trust investments	(52,038)	(58,242)	(34,430)
Proceeds from sale of ARO Trust investments	38,691us-gaap_ProceedsFromDecommissioningFund	45,607us-gaap_ProceedsFromDecommissioningFund	43,205us-gaap_ProceedsFromDecommissioningFund
Other, net	2,503	1,900	1,314
Net cash used in investing activities	(462,919)	(754,049)	(511,237)
Increase (decrease) in cash	60us-gaap_CashPeriodIncreaseDecrease	(72)us-gaap_CashPeriodIncreaseDecrease	21us-gaap_CashPeriodIncreaseDecrease
Cash at beginning of period	113us-gaap_Cash	185us-gaap_Cash	164us-gaap_Cash
Cash at end of period	173us-gaap_Cash	113us-gaap_Cash	185us-gaap_Cash
Increase to property, plant and equipment, net of equity AFUDC	(807,232)	(572,956)	(491,046)
Changes in related accounts payable and accrued liabilities	83,069	15,590	(16,838)
Property, plant and equipment additions, net of equity AFUDC	(724,163)	(557,366)	(507,884)
Supplemental Cash Flow Elements [Abstract]
Interest (exclusive of amount capitalized)	77,304us-gaap_InterestPaidNet	76,803us-gaap_InterestPaidNet	86,586us-gaap_InterestPaidNet
Income taxes	$ 864us-gaap_IncomeTaxesPaid	$ 116us-gaap_IncomeTaxesPaid	$ 254us-gaap_IncomeTaxesPaid

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The increase (decrease) in transportation and exchange gas receivable.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in the amount owed to the reporting entry (during the current year or operating cycle) in the form of loans and obligations (generally evidenced by promissory notes) made to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; an entity and its principal owners, management, or member of their immediate families; affiliates; or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in other obligations due by the reporting entity that are payable within one year (or one business cycle), not otherwise defined in the taxonomy.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The cash outflow for the settlement of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, as it matures.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for the purchase of investments that will be held in a decommissioning trust fund.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow from the sale of assets held in a decommissioning trust fund.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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Balance Type:	debit
Period Type:	duration

- Definition

Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

+ Details

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

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Period Type:	duration

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