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Mortgage Notes Payable and Line of Credit (Details Textual) (USD $)
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1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||||
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Dec. 31, 2010
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Dec. 31, 2012
Mortagage_Note
Property
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Dec. 31, 2011
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Dec. 31, 2010
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Jan. 31, 2012
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Dec. 31, 2010
Senior secured revolving credit facility [Member]
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Dec. 31, 2012
Senior secured revolving credit facility [Member]
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Dec. 31, 2012
Revolving Credit Facility [Member]
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Dec. 31, 2012
Letter of Credit [Member]
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Dec. 31, 2012
University of Phoenix Mortgage [Member]
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Dec. 31, 2012
Mortgage Notes Payable One [Member]
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Oct. 31, 2012
Mortgage Notes Payable [Member]
Property
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Dec. 31, 2012
Mortgage Notes Payable [Member]
Mortagage_Note
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Oct. 31, 2012
Mortgage Notes Payables Twenty Three [Member]
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Feb. 29, 2012
Mortgage Notes Payables Twenty Three [Member]
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| Mortgage Notes Payable and Line of Credit (Additional Textual) [Abstract] | ||||||||||||||||||
| Number of fixed-rate mortgage notes payable | 30 | |||||||||||||||||
| Weighted average interest rate on all debt outstanding | 5.46% | |||||||||||||||||
| Mortgage repayment | $ 52,285,000 | $ 6,311,000 | $ 2,687,000 | $ 45,200,000 | $ 2,300,000 | |||||||||||||
| Original maturity date of mortgage | 2030-04 | |||||||||||||||||
| Fair value of fixed-rate mortgage notes payable outstanding | 373,600,000 | |||||||||||||||||
| Repaid mortgage in full | 52,285,000 | 6,311,000 | 2,687,000 | 45,200,000 | 2,300,000 | |||||||||||||
| Debt maturity date | Dec. 01, 2013 | Oct. 01, 2013 | ||||||||||||||||
| Proceeds from long term debt | 34,000,000 | |||||||||||||||||
| Number of properties to collateralized mortgage notes payable | 7 | |||||||||||||||||
| Carrying value of fixed-rate mortgage notes payable outstanding | 359,185,000 | 285,350,000 | 358,300,000 | |||||||||||||||
| Line of Credit, outstanding | 50,000,000 | 50,000,000 | 50,000,000 | 25,000,000 | ||||||||||||||
| Line of credit at an interest rate | 3.00% | 3.00% | ||||||||||||||||
| Line of Credit, maturity date | Dec. 28, 2013 | |||||||||||||||||
| Letters of credit, outstanding | 6,100,000 | |||||||||||||||||
| Mortgage Notes Payable and Line of Credit (Textual) [Abstract] | ||||||||||||||||||
| Number of properties collateralized in fixed-rate mortgage notes payable | 64 | |||||||||||||||||
| Number of long-term mortgages issued | 11 | |||||||||||||||||
| Standby letters of credit sublimit | 20,000,000 | 20,000,000 | ||||||||||||||||
| Line of Credit, maximum borrowing capacity amended | 75,000,000 | |||||||||||||||||
| Number of properties pledged as collateral under Line of Credit | 14 | |||||||||||||||||
| Line of Credit, variable spread on interest rate | 3.00% | |||||||||||||||||
| Line of Credit, annual maintenance fees, percentage | 0.25% | |||||||||||||||||
| Line of Credit covenant limit of distributions to shareholders percentage | 95.00% | [1] | ||||||||||||||||
| Line of Credit, weighted average interest rate | 3.00% | 3.00% | ||||||||||||||||
| Line of credit facility, maximum additional amount drawn | $ 5,300,000 | |||||||||||||||||
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