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

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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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

+ Details

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: 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(b))

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Subparagraph b

-Article 5

+ Details

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Balance Type:	credit
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

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-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

+ Details

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Notes Payable, Unsecured Notes and Credit Facility (Details 2) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended
	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2014	Nov. 30, 2014	Mar. 31, 2014
Notes Payable, Unsecured Notes and Credit Facility
Repayment of unsecured notes		$ 150,000,000us-gaap_RepaymentsOfUnsecuredDebt	$ 100,000,000us-gaap_RepaymentsOfUnsecuredDebt	$ 381,001,000us-gaap_RepaymentsOfUnsecuredDebt
Repayments of secured mortgages		16,341,000us-gaap_RepaymentsOfSecuredDebt	0us-gaap_RepaymentsOfSecuredDebt	0us-gaap_RepaymentsOfSecuredDebt
Gains (losses) on extinguishment of debt	(412,000)	(412,000)	(14,921,000)	(1,179,000)
Term loan
Notes Payable, Unsecured Notes and Credit Facility
Principal amount of notes issued							300,000,000
Amount drawn		250,000,000
Unused borrowing capacity		50,000,000
Secured mortgage loan maturing in 2019
Notes Payable, Unsecured Notes and Credit Facility
Principal amount of notes issued					53,000,000
Amount drawn					38,000,000
Fixed rate notes					15,000,000
Fixed rate (as a percent)					2.99%
Secured mortgage loan maturing in 2019 \| LIBOR
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)		2.00%
Variable rate unsecured credit facility
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)		1.05%
Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Fixed rate notes		2,750,000,000	2,600,000,000
Fixed rate (as a percent)					5.375%
Repayment of unsecured notes					150,000,000
Unsecured notes \| Term loan \| LIBOR
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)		1.45%
Mortgage notes payable
Notes Payable, Unsecured Notes and Credit Facility
Amount drawn		1,047,461,000	1,011,609,000
Fixed rate notes		2,400,677,000	2,407,962,000
Repayments of secured mortgages	5,914,000
Mortgage notes payable \| Notes payable maturing in 2015
Notes Payable, Unsecured Notes and Credit Facility
Fixed rate (as a percent)	6.19%
Repayments of secured mortgages	10,427,000
Unsecured notes 3.50 percent
Notes Payable, Unsecured Notes and Credit Facility
Principal amount of notes issued						300,000,000
Net proceeds from issuance of debt						$ 295,803,000
Stated interest rate (as a percent)						3.50%