Debt (Summary of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Notes And Loans Payable	$ 8,331,993	$ 8,599,222
Senior unsecured notes	1,350,855	1,358,008
Revolving credit facility debt	295,870	1,170,000
Unsecured Debt [Member]
Debt Fiscal Year Maturity [Abstract]
2014	0
2015	500,000
2016	0
2017	0
2018	295,870
Thereafter	852,500
Notes And Mortgages Payable Fixed Rate [Member]
Debt Instrument [Line Items]
Notes And Loans Payable	7,563,133	6,771,001
Debt Instrument, Interest Rate at Period End (in percentage)	4.56%
Notes And Mortgages Payable Variable Rate [Member]
Debt Instrument [Line Items]
Notes And Loans Payable	768,860	1,828,221
Debt Instrument, Interest Rate at Period End (in percentage)	2.28%
Total Notes And Mortgages Payable [Member]
Debt Instrument [Line Items]
Notes And Loans Payable	8,331,993	8,599,222
Debt Instrument, Interest Rate at Period End (in percentage)	4.35%
Debt Fiscal Year Maturity [Abstract]
2014	189,953
2015	584,358
2016	1,556,375
2017	630,548
2018	744,472
Thereafter	4,625,224
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes	1,350,855	1,358,008
Debt Instrument, Interest Rate at Period End (in percentage)	5.69%
Unsecured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Revolving credit facility debt	295,870	1,170,000
Debt Instrument, Interest Rate at Period End (in percentage)	1.32%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unsecured Debt And Revolving Credit Facility	$ 1,646,725	$ 2,528,008
Debt Instrument, Interest Rate at Period End (in percentage)	4.90%

The effective interest rate at the end of the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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This element represents the toal amount of Unsecured Debt And Revolving Credit Facility.

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