Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

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States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (d)

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Pension and Other Post-Retirement Benefits (Assets with Fair Value Estimated Using NAV per share) (Details) (Pension Benefits, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	$ 323,493	$ 351,869	$ 328,726
Fund of funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	41,831	41,648
Common trust funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	122,628	98,024
Equity long/short hedge funds, Quarterly \| Fund of funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	5,479	5,673
Redemption frequency	Quarterly	Quarterly
Redemption Notice Period	45 days	45 days
Fund of fund composites, Annually \| Fund of funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31		35,975
Redemption frequency		Quarterly
Redemption Notice Period		45 days
Event driven hedge fund, Annually \| Common trust funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31		68,843
Redemption frequency		Annually
Redemption Notice Period		45 days
Fund of fund composites. Daily \| Fund of funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	36,352
Redemption frequency	Daily
Redemption Notice Period
Equity long/short hedge funds, Annually \| Common trust funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	12,770
Redemption frequency	Annually
Redemption Notice Period	90 days
Equity long/short hedge funds, Annually \| Common trust funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	59,727	12,560
Redemption frequency	Annually	Annually
Redemption Notice Period	45 days	90 days
Event driven hedge funds, Monthly \| Common trust funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	50,131
Redemption frequency	Monthly
Redemption Notice Period	90 days
Event driven hedge funds, Monthly \| Common trust funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31		16,621
Redemption frequency		Monthly
Redemption Notice Period		90 days
Separately managed fund, Monthly \| Separately managed fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	28,917	34,783
Redemption frequency	Monthly	Monthly
Redemption Notice Period	30 days	30 days
Separately managed fund, Quarterly \| Separately managed fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value December 31	$ 66,851	$ 76,634
Redemption frequency	Quarterly	Quarterly
Redemption Notice Period	45 days	45 days