Defined benefit plan required service period.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

The amount of employer securities or securities of parties related to the employer that are included in plan assets.

+ References

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

+ Details

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- Definition

The number of employer shares or related party shares included in plan assets.

+ References

+ Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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Employee Benefit Plans And Other Postretirement Benefits (Narrative) (Details) (USD $)	12 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Pension and SERPA Benefits [Member]	Dec. 31, 2012 Pension and SERPA Benefits [Member]	Dec. 31, 2011 Pension and SERPA Benefits [Member]	Dec. 31, 2013 Pension Plan Assets [Member]	Dec. 31, 2012 Pension Plan Assets [Member]	Dec. 31, 2014 Pension Plan Assets [Member] Scenario, Forecast [Member]	Dec. 31, 2013 Pension Plan Assets [Member] Equity Securities [Member]	Dec. 31, 2013 Pension Plan Assets [Member] Fixed Income Securities [Member]	Dec. 31, 2013 Postretirement Healthcare Benefits [Member]	Dec. 31, 2012 Postretirement Healthcare Benefits [Member]	Dec. 31, 2011 Postretirement Healthcare Benefits [Member]	Dec. 31, 2014 Postretirement Healthcare Benefits [Member] Scenario, Forecast [Member]	Dec. 31, 2013 Postretirement Healthcare Benefits [Member] Equity Securities [Member]	Dec. 31, 2013 Postretirement Healthcare Benefits [Member] Fixed Income Securities [Member]	Dec. 31, 2013 SERPA Benefits [Member]	Dec. 31, 2012 SERPA Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement benefits eligibility, years of service requirement	10 years
Accumulated benefit obligation				$ 1,600,000,000	$ 1,730,000,000													$ 25,800,000	$ 20,100,000
Projected benefit obligations				1,714,650,000	1,871,575,000	1,570,930,000						366,524,000	403,227,000	380,625,000				38,900,000	37,800,000
Target plan asset allocation										65.00%	35.00%					70.00%	30.00%
Investment in company common stock - shares							1,273,592	1,273,592
Investment in company common stock - value							88,200,000	62,200,000
Expected return on plan assets				7.75%	7.80%	8.00%			7.75%			8.00%	8.00%	8.00%	7.70%
Company contributions				176,947,000	216,741,000							27,849,000	27,675,000
Further contributions by company							0
Company contributions	$ 14,900,000	$ 15,300,000	$ 12,500,000