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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 Properties | Dec. 31, 2010 Properties | Dec. 31, 2009 Properties | Dec. 29, 2010 Note_Receivable_Forclosed | Dec. 31, 2011 20 Year Amortization Period [Member] Purchase money mortgage [Member] | Dec. 31, 2010 20 Year Amortization Period [Member] Purchase money mortgage [Member] | Dec. 31, 2011 Due 2015 [Member] | Dec. 31, 2010 Due 2015 [Member] | Dec. 31, 2011 Due 2016 [Member] Purchase money mortgage [Member] | Dec. 31, 2010 Due 2016 [Member] Purchase money mortgage [Member] | Dec. 31, 2011 Trenton Properties [Member] Properties | Dec. 29, 2010 Gibbsboro, New Jersey [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 18,186,000 | $ 18,205,000 |  |  | $ 7,200,000 | $ 7,400,000 | $ 500,000 | $ 800,000 | $ 23,400,000 | $ 22,900,000 | $ 23,400,000 |
Interest rate |  |  |  |  | 8.50% | 8.50% | 10.00% | 10.00% |  |  |  |
Notes receivable amortization period, years |  |  |  |  | 20 years | 20 years |  |  | 7 years | 7 years |  |
Cash pay interest rate |  |  |  |  |  |  |  |  | 6.00% | 6.00% |  |
Interest accrual rate |  |  |  |  |  |  |  |  | 7.64% | 7.64% |  |
Number of properties sold | 19 | 19 | 19 |  |  |  |  |  |  |  | 2 |
Gross deferred gain on sale of properties |  |  |  |  |  |  |  |  |  |  | 12,900,000 |
Expected proceeds from collection of notes receivable |  |  |  |  |  |  |  |  |  |  | 27,800,000 |
Purchase money mortgage loan repayments terms | start in 2012, to be fully paid in 2014 |  |  |  |  |  |  |  |  |  |  |
Number of foreclosed note receivables |  |  |  | 1 |  |  |  |  |  |  |  |
Settlement of note receivable through foreclosure of a parcel of land | $ 0 | $ 2,795,000 | $ 0 |  |  |  |  |  |  |  |  | $ 2,800,000

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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
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