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Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Discontinued Operations |  |  |
Time period within which sale or disposition of properties held for sale is probable (in years) | 1 |  |
Cash and Cash Equivalents |  |  |
Maximum term of original maturity to classify instruments as cash equivalents (in months) | 3 |  |
Tenant Rent Receivables and Straight-line Rent Receivable |  |  |
Period within which tenant rent receivables are expected to be collected (in years) | 1 |  |
Straight-line rent receivable | $ 28,545 | $ 18,584 |
Allowance for doubtful accounts - Tenant rent receivables |  |  |
Allowance for doubtful accounts activity |  |  |
Receivables charged off | 399 | 195 | 20
Increase (decrease) in allowance | 34 | 1,175 | 131
Allowance for doubtful accounts - Straight-line rent receivable |  |  |
Allowance for doubtful accounts activity |  |  |
Receivables charged off | 567 |  | 99
Increase (decrease) in allowance | $ 2 | $ 600 | $ (62)

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453417&loc=d3e39896-112707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-3 -Paragraph 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453417&loc=d3e39927-112707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 19 -Subparagraph b -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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