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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 Properties
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Notes receivable | $ 7,226,000 |  | $ 7,226,000 |  | $ 18,186,000
Number of properties sold |  |  |  |  | 2
Gross deferred gain on sale of properties |  |  |  |  | 12,900,000
Investment Income, Interest | 311,000 | 523,000 | 2,635,000 | 1,385,000 |
Purchase money mortgage loan repayments terms |  |  | start in 2013, to be fully paid in 2015 |  |
20 Year Amortization Period [Member] | Purchase money mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Notes receivable | 7,200,000 |  | 7,200,000 |  | 7,200,000
Interest rate |  |  | 8.50% |  | 8.50%
Notes receivable amortization period, years |  |  | 20 years |  | 20 years
Due 2015 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Notes receivable |  |  |  |  | 500,000
Interest rate |  |  | 10.00% |  | 10.00%
Proceeds from Collection of Notes Receivable |  |  | 300,000 |  |
Due 2016 [Member] | Purchase money mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Notes receivable |  |  |  |  | 23,400,000
Notes receivable amortization period, years |  |  | 7 years |  | 7 years
Cash pay interest rate |  |  |  |  | 6.00%
Interest accrual rate |  |  |  |  | 7.64%
Proceeds from Collection of Notes Receivable |  |  | 23,500,000 |  |
Trenton Properties [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of properties sold |  |  | 2 |  |
Gross deferred gain on sale of properties | 12,900,000 |  | 12,900,000 |  |
Investment Income, Interest |  |  | $ 1,000,000 |  |

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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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- Definition Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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