Investment in Office and Parking Properties - Business Combination, Pro Forma (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
2013 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 394,918	$ 363,498
Net loss attributable to common stockholders	(16,890)	(60,235)
Basic net income attributable to common stockholders	$ (0.52)	$ (2.38)
Diluted net income attributable to common stockholders	$ (0.52)	$ (2.38)
2014 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	370,980		493,708
Net loss attributable to common stockholders	$ (18,471)		$ 39,873
Basic net income attributable to common stockholders	$ (0.28)		$ 0.39
Diluted net income attributable to common stockholders	$ (0.28)		$ 0.37

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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