Business Acquisition Purchase Price Allocation Square Footage.

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- Definition

Notes Assumed, Unamortized Premium

+ References

No definition available.

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- Definition

Square Footage Encumbered by Mortgage Payable

+ References

No definition available.

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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- 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 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: 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(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-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

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Notes and Bonds Payable (Details) $ in Thousands				6 Months Ended
Notes and Bonds Payable (Details) $ in Thousands	Jun. 13, 2017 USD ($) ft²	May 01, 2017 USD ($) ft²	Mar. 06, 2017 USD ($) ft²	Jun. 30, 2017 USD ($) ft²	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Notes and bonds payable				$ 1,203,146	$ 1,264,370
Line of Credit \| Unsecured Credit Facility Due 2020
Debt Instrument [Line Items]
Notes and bonds payable				$ 35,000	107,000
Effective interest rate (percent)				2.22%
Medium-term Notes \| Term Loan Due 2019
Debt Instrument [Line Items]
Notes and bonds payable				$ 149,609	149,491
Effective interest rate (percent)				2.42%
Senior Notes \| Senior Notes due 2021, net of discount and issuance costs
Debt Instrument [Line Items]
Notes and bonds payable				$ 397,483	397,147
Effective interest rate (percent)				5.97%
Senior Notes \| Senior Notes due 2023, net of discount and issuance costs
Debt Instrument [Line Items]
Notes and bonds payable				$ 247,499	247,296
Effective interest rate (percent)				3.95%
Senior Notes \| Senior Notes due 2025, net of discount and issuance costs
Debt Instrument [Line Items]
Notes and bonds payable				$ 247,930	247,819
Effective interest rate (percent)				4.08%
Mortgages
Debt Instrument [Line Items]
Notes and bonds payable				$ 125,625	$ 115,617
Effective interest rate (percent)				5.06%
MINNESOTA \| Mortgages \| 6.5% Mortgage Note Payable
Debt Instrument [Line Items]
Mortgage note, interest rate (percent)		6.50%
Amount of debt repaid		$ 200
Square footage encumbered by mortgage payable (sqft) \| ft²		60,476
Real Estate Acquisition
Debt Instrument [Line Items]
Square footage \| ft²				172,636
Mortgage notes payable assumed				$ 12,100
Fair value adjustments				400
Real Estate Acquisition \| MINNESOTA
Debt Instrument [Line Items]
Square footage \| ft²			34,608
Mortgage notes payable assumed			$ 0
Real Estate Acquisition \| DISTRICT OF COLUMBIA
Debt Instrument [Line Items]
Effective interest rate (percent)	4.27%
Mortgage note, interest rate (percent)	4.69%
Square footage \| ft²	62,379
Mortgage notes payable assumed	$ 12,100
Fair value adjustments				$ 400