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Risk Management and Use of Financial Instruments (Details) (USD $) | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Unsecured Debt [Member] | Dec. 31, 2010 Unsecured Debt [Member] | Dec. 31, 2011 Unsecured Debt [Member] $325.0M 4.950% Guaranteed Notes due 2018 [Member] | Mar. 31, 2011 Unsecured Debt [Member] $325.0M 4.950% Guaranteed Notes due 2018 [Member] | Dec. 31, 2010 Unsecured Debt [Member] $325.0M 4.950% Guaranteed Notes due 2018 [Member] | Dec. 31, 2009 Interest Rate Swap [Member] | Dec. 31, 2011 Interest Rate Swap [Member] Cash Flow Hedging [Member] Treasury Lock Agreement [Member] | Mar. 31, 2011 Interest Rate Swap [Member] Cash Flow Hedging [Member] Treasury Lock Agreement [Member] | Mar. 31, 2011 Interest Rate Swap [Member] Cash Flow Hedging [Member] Treasury Lock Agreement [Member] 2.891% Treasury Rate [Member] | Mar. 31, 2011 Interest Rate Swap [Member] Cash Flow Hedging [Member] Treasury Lock Agreement [Member] 2.873% Treasury Rate [Member] | Mar. 31, 2011 Interest Rate Swap [Member] Cash Flow Hedging [Member] Treasury Lock Agreement [Member] 2.858% Treasury Rate [Member]
Risk Management and use of Financial Instruments (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 1,888,111,000 | $ 1,722,326,000 | $ 325,000,000 | $ 325,000,000 | $ 0 |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  |  | 4.95% | 4.95% |  |  |  |  |  |  |
Number of Treasury Lock agreements |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Fixed Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 2.891% | 2.873% | 2.858%
Fair value | 3,886,000 |  |  |  |  |  |  |  |  |  | 600,000 |  |  |
Notional Amount | 452,836,000 |  |  |  |  |  |  |  |  |  | 230,000,000 |  |  |
Remaining maturity |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |
Accumulated other comprehensive income related to debt offering that will be amortized over the term of the note | (6,079,000) | (1,945,000) |  |  |  |  |  |  |  | 600,000 |  |  |  |
Fair value adjustment of the hedge charged to expenses |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |
Gain on fair value hedge ineffectiveness |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
No. of tenants accounted for 10% or more of the Company's rents | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580 + Details
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