Fair Value of Financial Instruments (Redemption Of The Plan's Level 3 Investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013 JPM Multi Strat II C A Ser 11 07 [Member]	Dec. 31, 2013 Morgan Stanley Institutional Cayman Fund LP [Member]	Dec. 31, 2013 MS IFHF SVP LP Cayman [Member]	Dec. 31, 2013 MS IFHF SVP LP Alpha [Member]	Dec. 31, 2013 RII World Timberfund, LLC [Member]	Dec. 31, 2013 Comm Drive, LLC [Member]	Dec. 31, 2013 CTE Drive, LLC [Member]	Dec. 31, 2013 Oakbrook Parkway LLC [Member]	Dec. 31, 2013 West Jefferson, LLC [Member]	Dec. 31, 2013 MacCorkle Ave SE, LLC [Member]	Dec. 31, 2013 S Pike Road West, LLC [Member]	Dec. 31, 2013 N US 131, LLC [Member]	Dec. 31, 2013 E Stockton Blvd, LLC [Member]	Dec. 31, 2013 Interest in Limited Partnerships and Limited Liability Corporations [Member]	Dec. 31, 2012 Interest in Limited Partnerships and Limited Liability Corporations [Member]	Dec. 31, 2011 Interest in Limited Partnerships and Limited Liability Corporations [Member]	Dec. 31, 2013 Commingled Funds [Member]	Dec. 31, 2012 Commingled Funds [Member]	Dec. 31, 2011 Commingled Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 33,444	$ 26,188	$ 2,772	$ 1,504	$ 5,761	$ 8,557	$ 6,922	$ 24,955	$ 29,318	$ 15,987	$ 1,079	$ 1,063	$ 5,170	$ 129,276	$ 101,678	$ 104,033	$ 33,444	$ 39,814	$ 37,194
Redemption Frequency	Quarterly	Quarterly	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments	Through liquidation of underlying investments
Redemption Notice Period (in days)	65 days	60 days	None	None	None	None	None	None	None	None	None	None	None
Liquidation Period (in years)			2 years	2 years	10 years

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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)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258

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- Definition

States the notice requirement (for example, 30 to 60 days) the entity is required to deliver before it 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

+ Details

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- Definition

Estimate remaining period the underlying assets are expected to be liquidated by the investees for investments for which net asset value per share is calculated (including by unit, membership interest, or other ownership interest unit measure), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (b)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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