Fair Value Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Estimated fair value of the Company's debt obligations compared to their carrying amounts
Mortgages and secured loans payable	$ 5,969,336	$ 6,022,508
Total debt obligations	5,969,336	6,022,508
Reported Value Measurement [Member]
Estimated fair value of the Company's debt obligations compared to their carrying amounts
Mortgages and secured loans payable		3,178,841
Notes payable		240,300
Unsecured credit facility and term loan		2,603,367
Total debt obligations	5,969,336	6,022,508
Estimate of Fair Value Measurement [Member]
Estimated fair value of the Company's debt obligations compared to their carrying amounts
Mortgages and secured loans payable	2,793,090	3,337,250
Notes payable	1,209,590	252,441
Unsecured credit facility and term loan	2,120,000	2,619,475
Total debt obligations	$ 6,122,680	$ 6,209,166

Debt and Capital Lease Obligations, Fair Value Disclosure

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Line of Credit Facility, Amount Outstanding, Fair Value Disclosure

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- Definition

Mortgages and secured loans payable fair value disclosure.

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Mortgages payable including unamortized premium.

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No definition available.

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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.

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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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: 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)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Fair value portion of notes payable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20,22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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