The length of a debt maturity extension in months or years.

No definition available.

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- Definition

Competitive Bid Option % of Facility Amount

+ References

No definition available.

+ Details

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section S45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336

+ Details

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Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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

- 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

+ Details

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

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

+ Details

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

- Details

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- Details

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- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
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- Details

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- Details

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Namespace Prefix:
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- Details

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Subsequent Events (Details) $ in Thousands		1 Months Ended	9 Months Ended
Subsequent Events (Details) $ in Thousands	Oct. 02, 2017 USD ($) ft² bldg	Oct. 31, 2017	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 01, 2017 USD ($)
Agreement of Sale
Gross Proceeds			$ 56,474	$ 142,808
Subsequent Event [Member]
Credit Facility
debt issuance costs					$ 5,100
Subsequent Event [Member] \| 2017 subsequent event [Member] \| Southeastern PA [Member]
Agreement of Sale
Number of Real Estate Properties \| bldg	14
square feet \| ft²	641,000
Gross Proceeds	$ 75,400
Subsequent Event [Member] \| 2014 Credit Facility [Member] \| Line of Credit [Member]
Credit Facility
maximum borrowing capacity					800,000
Subsequent Event [Member] \| 2017 Credit Facility [Member] \| Line of Credit [Member]
Credit Facility
maximum borrowing capacity					900,000
length of maturity extension		1 year
annual facility fee		0.15%
Subsequent Event [Member] \| 2017 Credit Facility [Member] \| Revolving Credit Facility [Member]
Credit Facility
maximum borrowing capacity					800,000
basis spread on variable rate		0.875%
competitive bid option, percentage of facility		50.00%
Subsequent Event [Member] \| 2017 Credit Facility [Member] \| Commercial Paper [Member]
Credit Facility
maximum borrowing capacity					$ 100,000
basis spread on variable rate		0.95%