Investments In Real Estate (Purchase Price Allocation) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Business Acquisition [Line Items]
Investments in Real Estate	$ 105,521
Below-Market Lease	(4,136)
Acquisition Date Fair-Value	117,289
Acquired Above-Market Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	203
Weighted average remaining intangible assets amortization life (in months)	4 years 10 months 24 days
Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	15,701
Weighted average remaining intangible assets amortization life (in months)	6 years 10 months 24 days
17201 Waterview Parkway [Member]
Business Acquisition [Line Items]
Investments in Real Estate	8,479
Below-Market Lease	(2,087)
Acquisition Date Fair-Value	8,500
17201 Waterview Parkway [Member] \| Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	2,108
1900 S. Price Road [Member]
Business Acquisition [Line Items]
Investments in Real Estate	22,354
Acquisition Date Fair-Value	24,000
1900 S. Price Road [Member] \| Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	1,646
371 Gough Road [Member]
Business Acquisition [Line Items]
Investments in Real Estate	8,072
Acquisition Date Fair-Value	8,435
371 Gough Road [Member] \| Acquired Above-Market Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	12
371 Gough Road [Member] \| Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	351
1500 Towerview Road [Member]
Business Acquisition [Line Items]
Investments in Real Estate	30,244
Acquisition Date Fair-Value	37,000
1500 Towerview Road [Member] \| Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	6,756
Properties Acquired In 2013 [Member]
Business Acquisition [Line Items]
Weighted average remaining intangible liabilities amortization life (in months)	99 months
Properties Acquired In 2013 [Member] \| Acquired Above-Market Lease Value [Member]
Business Acquisition [Line Items]
Weighted average remaining intangible assets amortization life (in months)	38 months
Properties Acquired In 2013 [Member] \| Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Weighted average remaining intangible assets amortization life (in months)	101 months
Cartech [Member]
Business Acquisition [Line Items]
Investments in Real Estate	3,599
Acquisition Date Fair-Value	3,599
MetCenter Business Park [Member]
Business Acquisition [Line Items]
Investments in Real Estate	28,918
Below-Market Lease	(2,049)
Acquisition Date Fair-Value	31,900
MetCenter Business Park [Member] \| Acquired Above-Market Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	191
MetCenter Business Park [Member] \| Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	4,840
Liverpoolweg 10 [Member]
Business Acquisition [Line Items]
Investments in Real Estate	3,855
Acquisition Date Fair-Value	$ 3,855

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Offmarket Lease Unfavorable

+ References

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=9154965&loc=d3e2207-128464

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 12, 13, 14, 20, A107

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The net amount recognized as of the acquisition date for the aggregate identifiable assets acquired in excess of or less than the aggregate liabilities assumed.

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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

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