The number of metropolitan statistical areas, or MSAs, the entity operates in as of the balance sheet date.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Number of tenants reported by the entity.

+ References

No definition available.

+ Details

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- Definition

The period of notice to stockholders required for the Company's board of directors to amend, suspend, reduce, terminate or otherwise change the share repurchase program for any reason it deems appropriate.

+ References

No definition available.

+ Details

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- Definition

The average price per share of stock bought back by the entity at the exercise price or redemption price.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

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- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Balance Type:	na
Period Type:	duration

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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) tenants real_estate_investment metropolitan shares	Jun. 30, 2014 shares	Jun. 30, 2015 USD ($) tenants real_estate_investment metropolitan $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares
Summary of Significant Accounting Policies [Line Items]
Cash on deposit, including restricted cash, in excess of current federally insured levels	$ 43,600		$ 43,600
Number of metropolitan statistical areas in which Company owns real estate investments \| metropolitan	44		44
Number of Company owned real estate investments \| real_estate_investment	48		48
Period of notice required for changes to share repurchase program			30 days
Repurchase of common stock			$ 3,191	$ 1,151
Repurchase of common stock, average price per share (in dollars per share) \| $ / shares			$ 9.61	$ 9.59
Diluted earnings per share outstanding adjustment (in shares) \| shares	14,000	24,000	16,000	25,000
Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Number of metropolitan statistical areas in which Company owns real estate investments \| metropolitan	4		4
Rental Revenue [Member] \| Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Number of tenants \| tenants	2		2
Dallas-Ft. Worth-Arlington, Texas MSA [Member] \| Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage			13.90%
Chicago-Naperville-Elgin, Illinois-Indiana-Wisconsin MSA [Member] \| Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage			12.10%
Atlanta-Sandy Springs-Roswell, Georgia MSA [Member] \| Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.20%
Houston-The Woodlands-Sugar Land, Texas MSA [Member] \| Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.70%
AT&T Services, Inc. [Member] \| Rental Revenue [Member] \| Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage			13.40%
Bay Area Regional Medical Center, LLC [Member] \| Rental Revenue [Member] \| Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.50%
Common Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Repurchase of common stock (in shares) \| shares			332,434	120,000
Repurchase of common stock			$ 3
Consolidated Partnerships [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Company owned real estate investments \| real_estate_investment	2		2