Mortgages Payable (Schedule of Mortgages Payable) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.16%us-gaap_DebtWeightedAverageInterestRate
Amount Due at Maturity	$ 214,965
Mortgages payable	226,645us-gaap_SecuredDebt	227,189us-gaap_SecuredDebt
Southeastern Michigan Multi Family Properties [Member]
Debt Instrument [Line Items]
Stated interest rate	5.96%
Weighted Average Interest Rate	5.96%
Maturity Date	2016-07
Amount Due at Maturity	38,139
Mortgages payable	38,864	39,012
Oakview Plaza [Member]
Debt Instrument [Line Items]
Stated interest rate	5.49%
Weighted Average Interest Rate	5.49%
Maturity Date	2017-01
Amount Due at Maturity	25,583
Mortgages payable	26,319	26,425
Gulf Coast Industrial Portfolio [Member]
Debt Instrument [Line Items]
Stated interest rate	9.83%
Weighted Average Interest Rate	9.83%
Amount Due at Maturity	51,031
Mortgages payable	51,031	51,142
St Augustine Outlet Center [Member]
Debt Instrument [Line Items]
Stated interest rate	6.09%
Weighted Average Interest Rate	6.09%
Maturity Date	2016-04
Amount Due at Maturity	23,748
Mortgages payable	24,240	24,364
Gantry Park [Member]
Debt Instrument [Line Items]
Stated interest rate	4.48%
Weighted Average Interest Rate	4.48%
Maturity Date	2024-11
Amount Due at Maturity	65,317
Mortgages payable	74,500	74,500
DePaul Plaza [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate terms	Libor + 3.00%
Debt instrument, interest rate basis point above reference rate	3.00%
Weighted Average Interest Rate	3.17%
Maturity Date	2017-09
Amount Due at Maturity	11,147
Mortgages payable	$ 11,691	$ 11,746

Debt Instrument, Maturity, Month and Year

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

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- Details

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Period Type:	duration

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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