Redeemable Noncontrolling Interests / Redeemable Partnership Units (Activity of Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Redeemable Noncontrolling Interests Rollforward
Balance as of December 31			$ 1,278,446	$ 1,229,221
Net income	$ (1,878)	$ 4,366	9,057	11,410
Other comprehensive income			188	2,326
Distributions			(25,663)	(23,582)
Other, net			30,168	26,814
Balance as of September 30	$ 970,704	$ 1,248,323	970,704	1,248,323
Class A Unit
Redeemable Noncontrolling Interests Rollforward
Redemption of Class A units for common shares/units, at redemption value			(34,564)	(28,126)
Adjustments to carry redeemable Class A units at redemption value			(286,928)	$ 30,260
JBGS \| Class A Unit
Redeemable Noncontrolling Interests Rollforward
Adjustments to carry redeemable Class A units at redemption value			$ (224,069)

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Adjustments to reflect redeemable Class A Operating Partnership units

+ References

No definition available.

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- Definition

Other Net Attributable To Redeemable Noncontrolling Interest

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No definition available.

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