Pension and Other Postretirement Benefits (details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	$ 65,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	(58,000)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	943,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	(841,000)
Defined Benefit Plan, Information about Plan Assets [Abstract]
Plan Asset Receivable Or Payable Accrued Interest And Dividend Income	388,000	414,000
Plan Asset Receivable Or Payable Due From Broker Securities Sold	4,459,000	321,000
Total Pension Plan Asset Receivables	4,847,000	735,000
Plan Asset Receivable Or Payable Due From Broker Securities Purchased	935,000	839,000
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation Qualified Plans	404,000,000	362,900,000
Multiemployer Plan, Period Contributions	400,000	400,000	400,000
Defined Contribution Plan, Cost Recognized	2,200,000	2,400,000	2,100,000
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Regulatory	17,200,000
Defined Benefit Plan Amortization Of Net Gains Losses Regulatory	16,800,000
Defined Benefit Plan Amortization Of Net Prior Service Cost Credit Regulatory	400,000
Defined Benefit Obligations Non Qualified Supplemental	31,900,000	28,200,000
Qualified Defined Benefit Plans Benefit Obligation Underfunded	154,400,000
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Range Of Pension Costs Capitalized	30% to 40%
Defined Benefit Plan, Fair Value of Plan Assets	249,603,000	215,970,000
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Amortization of Net Gains (Losses)	1,300,000
Pension and Other Postretirement Benefit Contributions [Abstract]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.50%
Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year Prescription Drugs	10.50%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2023
Qualified Contributions Expected During Next Fiscal Year	up to $15 million
Level 3 Change In Fair Value Of Plan Assets Roll Forward [Abstract]
Level 3 Plan Assets Balance	0	15,317,000
Level 3 Purchases Sales And Settlements	(15,317,000)
Plan Asset Target Allocation [Abstract]
US Large Cap Equity Pension Plan Asset Target Allocation	13.00%
US Small Mid Cap Equity Pension Plan Asset Target Allocation	8.50%
Non US Equity Pension Plan Asset Target Allocation	13.00%
Emerging Markets Equity Pension Plan Asset Target Allocation	3.50%
Long Government Credit Pension Plan Asset Target Allocation	30.00%
High Yield Pension Plan Asset Target Allocation	5.00%
Emerging Market Debt Pension Plan Asset Target Allocation	5.00%
Real Estate Funds Pension Plan Asset Target Allocation	6.00%
Absolute Return Strategy Pension Plan Asset Target Allocation	11.00%
Real Return Strategy Pension Plan Asset Target Allocation	5.00%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	435,889,000	391,127,000	339,338,000
Defined Benefit Plan, Service Cost	8,047,000	7,122,000	6,688,000
Defined Benefit Plan, Interest Cost	17,295,000	18,134,000	18,029,000
Defined Benefit Plan, Actuarial Gain (Loss)	37,615,000	44,802,000
Defined Benefit Plan, Benefits Paid	18,195,000	18,269,000	18,645,000
Defined Benefit Plan, Fair Value of Plan Assets	249,603,000	215,970,000	219,014,000
Defined Benefit Plan, Actual Return on Plan Assets	26,683,000	(6,684,000)
Defined Benefit Plan, Contributions by Employer	25,145,000	21,909,000
Defined Benefit Plan, Funded Status of Plan	(186,286,000)	(175,157,000)
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Service Cost	8,047,000	7,122,000	6,688,000
Defined Benefit Plan, Interest Cost	17,295,000	18,134,000	18,029,000
Defined Benefit Plan, Actual Return on Plan Assets	(19,082,000)	(17,867,000)	(18,207,000)
Defined Benefit Plan Amortization Of Transition Obligations	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	195,000	352,000	187,000
Defined Benefit Plan, Amortization of Net Gains (Losses)	15,631,000	11,584,000	7,447,000
Defined Benefit Plan Net Periodic Benefit Cost	22,086,000	19,325,000	14,144,000
Defined Benefit Plan Amount Allocated To Construction	(5,820,000)	(4,905,000)	(3,729,000)
Defined Benefit Plan Net Amount Deferred To Regulatory Balancing Account	(7,876,000)	(6,008,000)	0
Defined Benefit Plan Net Amount Charged To Expense	8,390,000	8,412,000	10,415,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.51%	5.49%	6.01%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.00%	8.25%	8.25%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.85%	4.51%	5.49%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Low Range	3.25%	3.25%	3.25%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation High Range	5.00%	5.00%	5.00%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Low Range	3.25%	3.25%	3.25%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation High Range	5.00%	5.00%	5.00%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Assets	7.50%	8.00%	8.25%
Pension and Other Postretirement Benefit Contributions [Abstract]
Qualified Defined Benefit Pension Plan Contributions	25,559,000	22,325,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	13,803,000
Defined Benefit Plan, Benefits Paid	18,195,000	18,269,000	18,645,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	19,732,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	20,244,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	20,788,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	21,490,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	22,245,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	128,609,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	33,119,000	30,049,000	27,676,000
Defined Benefit Plan, Service Cost	592,000	614,000	588,000
Defined Benefit Plan, Interest Cost	1,267,000	1,404,000	1,436,000
Defined Benefit Plan, Actuarial Gain (Loss)	3,182,000	2,225,000
Defined Benefit Plan, Benefits Paid	1,971,000	1,870,000	1,476,000
Defined Benefit Plan, Fair Value of Plan Assets	0	0	0
Defined Benefit Plan, Actual Return on Plan Assets	0	0
Defined Benefit Plan, Contributions by Employer	1,971,000	1,870,000
Defined Benefit Plan, Funded Status of Plan	(33,119,000)	(30,049,000)
Defined Benefit Plan Amounts Recognized In Regulatory Amortization And Other Comprehensive Income Net Prior Service Cost Credit Before Tax [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	3,182,000	2,225,000	2,387,000
Regulatory Amortization Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Before Tax	(411,000)	(411,000)	(411,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	(197,000)	(197,000)	(197,000)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, beore Tax	(435,000)	(289,000)	(131,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	2,139,000	1,328,000	1,648,000
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Service Cost	592,000	614,000	588,000
Defined Benefit Plan, Interest Cost	1,267,000	1,404,000	1,436,000
Defined Benefit Plan, Actual Return on Plan Assets	0	0	0
Defined Benefit Plan Amortization Of Transition Obligations	411,000	411,000	411,000
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	197,000	197,000	197,000
Defined Benefit Plan, Amortization of Net Gains (Losses)	435,000	289,000	131,000
Defined Benefit Plan Net Periodic Benefit Cost	2,902,000	2,915,000	2,763,000
Defined Benefit Plan Amount Allocated To Construction	(882,000)	(878,000)	(904,000)
Defined Benefit Plan Net Amount Deferred To Regulatory Balancing Account	0	0	0
Defined Benefit Plan Net Amount Charged To Expense	2,020,000	2,037,000	1,859,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	0	411,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	882,000	1,079,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	9,681,000	6,934,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	10,563,000	8,424,000
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.33%	5.16%	5.78%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.56%	4.33%	5.16%
Pension and Other Postretirement Benefit Contributions [Abstract]
Qualified Defined Benefit Pension Plan Contributions	1,971,000	1,870,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	2,004,000
Defined Benefit Plan, Benefits Paid	1,971,000	1,870,000	1,476,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	2,004,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	2,080,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	2,108,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	2,169,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	2,213,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	11,514,000
Qualified Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	249,600,000	216,000,000
Defined Benefit Plan Amounts Recognized In Regulatory Amortization And Other Comprehensive Income Net Prior Service Cost Credit Before Tax [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	26,504,000	66,404,000	17,115,000
Regulatory Amortization Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Before Tax	0	0	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	(230,000)	(230,000)	(230,000)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, beore Tax	(14,482,000)	(10,731,000)	(6,740,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	11,792,000	55,443,000	10,145,000
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	1,097,000	1,328,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	188,278,000	176,255,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	189,375,000	177,583,000
Non-Qualified Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Amounts Recognized In Regulatory Amortization And Other Comprehensive Income Net Prior Service Cost Credit Before Tax [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	3,511,000	2,948,000	1,716,000
Regulatory Amortization Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Before Tax	0	0	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	35,000	(122,000)	43,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, beore Tax	(1,150,000)	(854,000)	(707,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	2,396,000	1,972,000	1,052,000
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(12,000)	(48,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	15,327,000	12,966,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	$ 15,315,000	$ 12,918,000

Absolute Return Strategy Pension Plan Asset Target Allocation

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Non-Qualified Supplemental Define Benefit Pension Obligation

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The amounts in regulatory assets related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented

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No definition available.

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The amounts in regulatory assets related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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Net periodic benefit cost allocated to construction.

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The aggregate amount in regulatory assets expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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No definition available.

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Higher percentage for the range for the compensation increase for benefit obligation.

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Lower percentage for the range for the compensation increase for benefit obligation.

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Higher percentage for the range for the compensation increase for benefit cost.

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Lower percentage for the range for the compensation increase for benefit cost.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. Prescription Drugs

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- Definition

Net periodic benefit cost charged to expense.

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Net periodic benefit cost deferred to regulatory balancing account.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Qualified Plans.

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No definition available.

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- Definition

Emerging Market Debt Pension Plan Asset Target Allocation

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Emerging Markets Equity Pension Plan Asset Target Allocation

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- Definition

High Yield Pension Plan Asset Target Allocation

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Level 3 Plan Assets Balance, beginning and ending

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Purchases, sales, and settlements of level 3 plan assets that occurred during the period.

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Long Government Credit Pension Plan Asset Target Allocation

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Non US Equity Pension Plan Asset Target Allocation

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- Definition

Receivable (Asset) or liability specifically reserved for pension and other postretirement benefit plans. Accrued Interest and Dividend Income

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Receivable (Asset) or liability specifically reserved for pension and other postretirement benefit plans. Due to Securites Purchased

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No definition available.

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Receivable (Asset) or liability specifically reserved for pension and other postretirement benefit plans. Due from Securites Sold

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- Definition

The employer's best estimate, as soon as it can be reasonably determined, of qualified contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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For qualified defined benefit pension plans, the net benefit obligation, which is the value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date offset by pension assets.

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No definition available.

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Range of pension costs capitalized

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Real Estate Funds Pension Plan Asset Target Allocation

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No definition available.

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Real Return Strategy Pension Plan Asset Target Allocation

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Total Pension Plan Asset Receivables

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- Definition

US Large Cap Equity Pension Plan Asset Target Allocation

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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The interest rate used to adjust for the time value of money for the plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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