Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Real Estate Fund [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	$ 667,710	$ 600,786
Purchases	3,392	43,816
Sales/Dispositions/Distributions	(307,268)	(70,848)
Net realized gains	73,802	85,771
Net unrealized gains	76,337	8,184
Other, Net	0	1
Closing Balance - changes in Level 3 " deferred compensation plan assets"	513,973	667,710
Real Estate Fund [Member] \| Minimum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	12.00%
Terminal capitalization rates	4.70%
Fair Value Measurement Anticipated Investment Holding Period	0 years 9 months 18 days
Real Estate Fund [Member] \| Maximum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	17.50%
Terminal capitalization rates	6.50%
Fair Value Measurement Anticipated Investment Holding Period	6 years 0 months 0 days
Real Estate Fund [Member] \| Weighted Average [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	13.70%
Terminal capitalization rates	5.30%
Deferred Compensation Plan Assets [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	68,782	62,631
Purchases	14,162	5,018
Sales/Dispositions/Distributions	(24,951)	(7,306)
Realized and unrealized gains	3,415	7,189
Other, Net	1,907	1,250
Closing Balance - changes in Level 3 " deferred compensation plan assets"	$ 63,315	$ 68,782

Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

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Period Type:	duration

- Definition

Amount of purchases 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)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

- Definition

Amount of sale 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)(2)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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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=36462937&loc=d3e19207-110258

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Anticipated holding period of investments

+ References

No definition available.

+ Details

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Realized And Unrealized

+ References

No definition available.

+ Details

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- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Gain Loss Net

+ References

No definition available.

+ Details

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- Definition

This element represents Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Realized Gain (Loss) Included In Earnings.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

This element represents Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Realized Gain (Loss) Included In Earnings.

+ References

No definition available.

+ Details

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