Schedule III - Real Estate and Accumulated Depreciation (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment in real estate:
Balance, beginning of year	$ 716,285	$ 669,387	$ 512,227
Acquisitions	25,642us-gaap_RealEstateOtherAcquisitions	13,801us-gaap_RealEstateOtherAcquisitions	0us-gaap_RealEstateOtherAcquisitions
Improvements and development expenditures	194,795us-gaap_RealEstateImprovements	106,806us-gaap_RealEstateImprovements	158,175us-gaap_RealEstateImprovements
Asset disposals	(760)us-gaap_RealEstateCostOfRealEstateSold	(1,283)us-gaap_RealEstateCostOfRealEstateSold	(1,015)us-gaap_RealEstateCostOfRealEstateSold
Disposition of student housing properties	0	(67,702)	0
Impairment of student housing properties	0	(4,724)	0
Balance, end of year	935,962	716,285	669,387
Accumulated depreciation:
Balance, beginning of year	102,356	97,820	76,164
Depreciation for the year	26,387	25,183	22,472
Asset disposals	(622)	(933)	(865)
Disposition of student housing properties	0	(19,714)	0
Other Reclassifications	0	0	49
Balance, end of year	128,121	102,356	97,820
Development in process	0us-gaap_DevelopmentInProcess	91,184us-gaap_DevelopmentInProcess	50,781us-gaap_DevelopmentInProcess
Land held for sale	38,105us-gaap_LandAvailableForSale	0us-gaap_LandAvailableForSale	0us-gaap_LandAvailableForSale
Land held for investment	7,413us-gaap_LandAvailableForDevelopment	0us-gaap_LandAvailableForDevelopment	0us-gaap_LandAvailableForDevelopment
Investment in real estate, net	$ 853,359us-gaap_RealEstateInvestmentPropertyNet	$ 705,113us-gaap_RealEstateInvestmentPropertyNet	$ 622,348us-gaap_RealEstateInvestmentPropertyNet

Represents the disposition of student housing properties.

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- Definition

Represents the depreciation accumulated in relate with disposition of students housing properties.

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No definition available.

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- Definition

Represents the Impairment of student housing properties

+ References

No definition available.

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- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

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- Definition

Carrying amount of land available for development.

+ References

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- Definition

Carrying value of land held for sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 14

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph d

-Article 7

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- Definition

Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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- Definition

Amount of increase (decrease) in accumulated depreciation on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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- Definition

Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

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- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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- Definition

Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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