Fair Value Measurements (Details 1) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Real Estate Fund [Member]
Unobservable Quantitative Input [Abstract]
Beginning balance	$ 513,973	$ 667,710
Purchases	95,010	3,392
Sales/Dispositions/distributions	(91,450)	(307,268)
Net unrealized gains	54,995	73,802
Net realized gains	2,757	76,337
Other, net	(524)	0
Ending balance	$ 574,761	513,973
Real Estate Fund [Member] \| Minimum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	12.00%
Capitalization rate	4.80%
Real Estate Fund [Member] \| Maximum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	14.90%
Capitalization rate	6.10%
Real Estate Fund [Member] \| Weighted Average [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	13.60%
Capitalization rate	5.50%
Deferred Compensation Plan Assets [Member]
Unobservable Quantitative Input [Abstract]
Beginning balance	$ 63,315	68,782
Purchases	9,062	14,162
Sales/Dispositions/distributions	(13,252)	(24,951)
Realized and unrealized gain	(501)	3,415
Other, net	562	1,907
Ending balance	$ 59,186	$ 63,315

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

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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

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- 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

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- 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

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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

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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

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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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- 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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- References

No definition available.

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