The number of loans deemed to be questionable as to collection.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

Number of tenants reported by the entity.

+ References

No definition available.

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- Definition

The number of tenants experiencing financial difficulties.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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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

Maximum number of shares of common stock available for repurchase during any calendar year as a proportion of common stock outstanding at the end of the prior year.

+ 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.

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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
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-SubTopic 10
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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
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-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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

- Definition

Amount of expense related to loss from loan transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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

- 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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Data Type:	xbrli:sharesItemType
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
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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

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-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	xbrli:sharesItemType
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Period Type:	duration

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- Details

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- Details

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- Details

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- Details

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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) receivable real_estate_investment metropolitan tenant $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)
Summary of Significant Accounting Policies [Line Items]
Provision for doubtful accounts	$ 7,664	$ 0
Number of tenants experiencing financial difficulties \| tenant	2
Notes receivable before allowances for loan losses	$ 20,275		$ 19,422
Provision for loan losses	$ 2,484	0
Number of notes receivable nonperforming \| receivable	2
Number of metropolitan statistical areas in which Company owns real estate investments \| metropolitan	46
Number of Company owned real estate investments \| real_estate_investment	49
Period of notice required for changes to share repurchase program	30 days
Maximum number of shares available for repurchase during any calendar year, as percentage of common stock outstanding at end of prior year	5.00%
Repurchase of common stock	$ 12,101	$ 8,393
Repurchase of common stock, average price per share (in dollars per share) \| $ / shares	$ 9.82	$ 9.64
Diluted earnings per share outstanding adjustment (in shares) \| shares	17,000	17,000
Common Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Repurchase of common stock (in shares) \| shares	1,232,088	871,000
Repurchase of common stock	$ 12
Rental Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage	5.00%
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	2
Rental Revenue [Member] \| Geographic Concentration Risk [Member] \| Dallas-Ft. Worth-Arlington, Texas MSA [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage	12.20%
Rental Revenue [Member] \| Geographic Concentration Risk [Member] \| Chicago-Naperville-Elgin, Illinois-Indiana-Wisconsin MSA [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.80%
Rental Revenue [Member] \| Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Number of tenants \| tenant	1
Rental Revenue [Member] \| Customer Concentration Risk [Member] \| AT&T Services, Inc. [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.70%
Consolidated Partnership [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Company owned real estate investments \| real_estate_investment	1