Investments In Real Estate (Purchase Price Allocation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Business Acquisition [Line Items]
Investments in Real Estate	$ 174,585
Below-Market Lease	(5,781)
Debt Premium	(1,640)
Acquisition Date Fair-Value	188,178
Acquired Above-Market Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	203
Weighted average remaining intangible assets amortization life (in months)	4 years 6 months
Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	20,811
Weighted average remaining intangible assets amortization life (in months)	6 years 7 months 6 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
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
Saito Industrial Park [Member]
Business Acquisition [Line Items]
Investments in Real Estate	9,649
Acquisition Date Fair-Value	9,649
Principal Park [Member]
Business Acquisition [Line Items]
Investments in Real Estate	19,253
Acquisition Date Fair-Value	19,253
De President, Hoofddorp [Member]
Business Acquisition [Line Items]
Investments in Real Estate	6,737
Acquisition Date Fair-Value	6,737
636 Pierce Street [Member]
Business Acquisition [Line Items]
Investments in Real Estate	33,425
Below-Market Lease	(1,645)
Debt Premium	(1,640)
Acquisition Date Fair-Value	35,250
636 Pierce Street [Member] | Acquired In Place Lease Value [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 5,110
Properties Acquired In 2013 [Member]
Business Acquisition [Line Items]
Weighted average remaining intangible liabilities amortization life (in months)	98 months
Weighted average remaining debt premium amortization life (in months)	112 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)	32 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)	108 months