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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 Properties
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | $ 7,226,000 | $ 18,186,000
Number of properties sold |  | 2
Gross deferred gain on sale of properties |  | 12,900,000
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
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 |

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- Definition Notes Receivable Amortization Period, Years + References No definition available. + Details
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- Definition Notes Receivable Cash Pay Interest, Percentage + References No definition available. + Details
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- Definition Notes Receivable Interest Accrual, Percentage + References No definition available. + Details
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- Definition Number of properties sold. + References No definition available. + Details
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- Definition Purchase Money Mortgage Loan Repayments Terms. + References No definition available. + Details
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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 The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: 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 IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 + Details
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- Definition For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -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 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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