Debt Instrument, Maturity Period, Extension Option

No definition available.

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- Definition

Debt Instrument, Percentage of Principal Amount Received

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Maximum Borrowing Capacity, Increase in Capacity

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Notional Amount of Interest Rate Derivative, Terminated Amount

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: 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)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: 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

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ 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

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after 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 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Debt - Textuals (Details) (USD $)			9 Months Ended		0 Months Ended				0 Months Ended		9 Months Ended		0 Months Ended			0 Months Ended	9 Months Ended	0 Months Ended		9 Months Ended		0 Months Ended
Debt - Textuals (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Fixed rate mortgages	Dec. 31, 2012 Fixed rate mortgages	Mar. 28, 2013 Secured real estate term loan	Sep. 30, 2013 Secured real estate term loan	Dec. 31, 2012 Secured real estate term loan	Mar. 28, 2013 Interest Rate Swap	Mar. 29, 2012 JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc.	Mar. 07, 2013 Unsecured revolving credit facility JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc.	Sep. 30, 2013 Unsecured revolving credit facility JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc.	Mar. 29, 2012 Unsecured revolving credit facility JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc.	Mar. 07, 2013 Unsecured revolving credit facility JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc. Minimum	Mar. 07, 2013 Unsecured revolving credit facility JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc. Maximum	Sep. 30, 2013 Unsecured term loans JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc., With Interest Rate Swap	Mar. 29, 2012 Unsecured term loans JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc.	Sep. 30, 2013 Unsecured term loans JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc.	Mar. 29, 2012 Unsecured term loans JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc. Minimum	Mar. 29, 2012 Unsecured term loans JPMorgan Securities, LLC, Wells Fargo Securities, LLC and Deutsche Bank Securities Inc. Maximum	Sep. 30, 2013 Unsecured term loans Wells Fargo	Jul. 20, 2012 Unsecured term loans Wells Fargo	Jul. 20, 2012 Unsecured term loans Wells Fargo Minimum	Jul. 20, 2012 Unsecured term loans Wells Fargo Maximum	Sep. 30, 2013 Unsecured term loans Wells Fargo, With Interest Rate Swap	Mar. 28, 2013 Unsecured senior notes
Debt Instrument
Line of credit facility, borrowing capacity										$ 650,000,000.0		$ 575,000,000
Long-term debt	1,125,636,000	1,034,956,000	370,636,000	382,456,000		0	125,500,000									300,000,000					155,000,000				300,000,000
Line of credit facility, maximum borrowing capacity, increase in capacity										75,000,000.0
Unsecured credit agreement, extension option period									1 year
Description of variable rate basis										LIBOR						LIBOR
Basis spread on variable rate											1.55%		1.10%	1.75%			1.85%	1.30%	2.25%	2.00%		1.55%	2.40%
Line of credit facility, unused capacity, commitment fee percentage											0.35%		0.20%	0.50%
Debt instrument, interest rate															2.95%									3.29%
Debt instrument, interest rate																									3.70%
Debt instrument, percentage of principal amount received																									99.186%
Effective percentage rate range, minimum			4.55%
Effective percentage rate range, maximum			12.75%
Weighted average interest rate			5.86%
Repayments of debt					125,500,000
Notional amount terminated								$ 75,000,000