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Notes Payable, Unsecured Notes and Credit Facility (Details 3) (USD $) In Thousands, unless otherwise specified																										3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Secured notes	Mar. 31, 2014 Secured notes Notes payable maturing in 2014	Mar. 31, 2014 Secured notes Notes payable maturing in 2015	Mar. 31, 2014 Secured notes Notes payable maturing in 2016	Mar. 31, 2014 Secured notes Notes payable maturing in 2017	Mar. 31, 2014 Secured notes Notes payable maturing in 2018	Mar. 31, 2014 Secured notes Notes payable maturing in 2019	Mar. 31, 2014 Secured notes Notes Payable 6.100 Percent Maturities 2020	Mar. 31, 2014 Secured notes Notes payable maturing in 2021	Mar. 31, 2014 Secured notes Notes payable maturing in 2022	Mar. 31, 2014 Secured notes Notes payable maturing in 2023	Mar. 31, 2014 Secured notes Notes payable with maturities after 2023	Mar. 31, 2014 Unsecured notes	Mar. 31, 2014 Unsecured notes Notes payable maturing in 2014	Mar. 31, 2014 Unsecured notes Notes payable maturing in 2016	Mar. 31, 2014 Unsecured notes Notes payable maturing in 2017	Mar. 31, 2014 Unsecured notes Notes Payable 6.100 Percent Maturities 2020	Mar. 31, 2014 Unsecured notes Notes Payable 3.625 Percent Maturities 2020	Mar. 31, 2014 Unsecured notes Notes payable maturing in 2021	Mar. 31, 2014 Unsecured notes Notes payable maturing in 2022	Mar. 31, 2014 Unsecured notes Notes payable maturing in 2023	Mar. 31, 2014 Unsecured notes Notes payable with maturities after 2023	Mar. 31, 2014 Unsecured notes Term Loan	Mar. 31, 2014 Unsecured notes Term Loan LIBOR
Notes Payable, Unsecured Notes and Credit Facility
Secured notes payments			$ 203,004	$ 12,753	$ 16,743	$ 17,874	$ 19,060	$ 18,413	$ 7,145	$ 6,205	$ 5,985	$ 6,352	$ 6,596	$ 85,878
Mortgage notes payable and unsecured notes	$ 6,275,178	$ 6,029,998	$ 3,222,174		$ 603,044	$ 16,255	$ 710,491	$ 76,928	$ 610,811	$ 50,824	$ 27,844			$ 1,125,977	$ 2,850,000	$ 150,000	$ 250,000	$ 250,000	$ 250,000	$ 400,000	$ 250,000	$ 450,000	$ 350,000	$ 250,000	$ 250,000
Stated interest rate of unsecured notes (as a percent)																5.375%	5.75%	5.70%	6.10%	3.625%	3.95%	2.95%	4.30%	3.00%
Debt instrument variable rate																										LIBOR
Debt instrument, basis spread on variable rate (as a percent)																										1.45%

X

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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- Definition

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.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13, 16

-Article 9

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