Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Assets:
Fair value of available-for-sale securities	$ 14,974	$ 13,973
Interest rate cap, fair value		0
Liabilities:
Interest rate swaps	3,603	4,007
Long-term debt, fair value	5,070,485	5,126,300
Mortgage and other indebtedness	4,799,817	4,857,523
Holding period	10 years
Assumed capitalization rate range used to determine fair value	9% to 12%
Minimum [Member]
Liabilities:
Fair value assumptions, capitalization rate	9.00%
Maximum [Member]
Liabilities:
Fair value assumptions, capitalization rate	12.00%
Interest Rate Cap [Member]
Liabilities:
Derivative instruments held	0	1
Interest Rate Swap [Member]
Liabilities:
Derivative instruments held	4	4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Fair value of available-for-sale securities	14,974	13,973
Interest rate cap, fair value		0
Liabilities:
Interest rate swaps	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Fair value of available-for-sale securities	0	0
Interest rate cap, fair value		0
Liabilities:
Interest rate swaps	3,603	4,007
Fair Value, Inputs, Level 3 [Member]
Assets:
Fair value of available-for-sale securities	0	0
Interest rate cap, fair value		0
Liabilities:
Interest rate swaps	$ 0	$ 0

Assumed Capitalization Rate Range Used To Determine Fair Value

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- Definition

Fair Value Assumptions, Capitalization Rate

+ References

No definition available.

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- Details

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

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-Paragraph 1A

-Subparagraph (d)

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+ Details

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Period Type:	instant

- Definition

Period the instrument, asset or liability is expected to be outstanding, 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

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-Section 50

-Paragraph 2

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- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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