MAALP Capital (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Limited Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	$ 161,310	$ 166,746
Net Income Allocated to Limited Partners	16,078	6,364
General partner units issued in exchange for limited partner units	(236)	(992)
Adjustment for noncontrolling interest ownership in operating partnership	58	28
Distributions	(9,671)	(9,209)
Ending Balance	167,539	162,937
General Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	2,890,858	2,946,598
Net Income Allocated to General Partners	289,300	113,455
Issuance of units	326	728
Units repurchased and retired	(957)	(456)
Exercise of unit options	420	11,916
General partner units issued in exchange for limited partner units	236	992
Units issued in exchange for redeemable units		998
Redeemable stock fair market value	(614)	(286)
Adjustment for noncontrolling interest ownership in operating partnership	(58)	(28)
Amortization of unearned compensation	4,950	3,180
Distributions	(174,100)	(164,598)
Ending Balance	3,010,361	2,912,499
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	(376)	174
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)	(6,222)	303
Ending Balance	(6,598)	477
Total Partnership Capital [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	3,051,792	3,113,518
Net Income Available for Common Unitholders	305,378	119,819
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)	(6,222)	303
Issuance of units	326	728
Units repurchased and retired	(957)	(456)
Exercise of unit options	420	11,916
General partner units issued in exchange for limited partner units	0	0
Units issued in exchange for redeemable units		998
Redeemable stock fair market value	(614)	(286)
Adjustment for noncontrolling interest ownership in operating partnership	0	0
Amortization of unearned compensation	4,950	3,180
Distributions	(183,771)	(173,807)
Ending Balance	$ 3,171,302	$ 3,075,913

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- Definition

Distributions

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- Definition

Fair value option and measurement.

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- Definition

General Partnership Units Issued in Exchange for Limited Partnership Units

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Net Income Available for Common Unitholders

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Partnership units issued in exchange for redeemable units

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Units Issued During Period, Value, New Issues

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Units Issued During Period, Value, Unit Options Exercised

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Units Repurchased and Retired During Period, Value

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

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Aggregate amount of net income allocated to general partners.

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Aggregate amount of net income allocated to limited partners.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The amount of ownership interest of different classes of partners in limited partnership.

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