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Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 578,610 |  | $ 452,836 |
Fair value | 18,741 |  | 3,886 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.623% Interest Rate Swap Maturing February 1, 2019 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 200,000 | [1] | 200,000 | [1]
Derivative, Fixed Interest Rate | 3.623% | [1] |  |
Fair value | 9,523 | [1] | 2,820 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.702% Interest Rate Swap Maturing February 1, 2016 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 127,000 | [1] | 127,000 | [1]
Derivative, Fixed Interest Rate | 2.702% | [1] |  |
Fair value | 2,385 | [1] | 340 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.470% Interest Rate Swap Maturing February 1, 2015 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 50,000 | [1] | 50,000 | [1]
Derivative, Fixed Interest Rate | 2.47% | [1] |  |
Fair value | 509 | [1] | 65 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.513% Interest Rate Swap Maturing May 1, 2015 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 23,000 | [1] | 23,000 | [1]
Derivative, Fixed Interest Rate | 2.513% | [1] |  |
Fair value | 271 | [1] | 27 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.750% Interest Rate Swap Maturing September 30, 2017 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 27,062 | [1] | 27,062 | [1]
Derivative, Fixed Interest Rate | 2.75% | [1] |  |
Fair value | 993 | [1] | 244 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.300% Interest Rate Swap Maturing January 30, 2021 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 25,774 | [1] | 25,774 | [1]
Derivative, Fixed Interest Rate | 3.30% | [1] |  |
Fair value | 1,408 | [1] | 390 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.780% Interest Rate Swap Maturing August 1, 2016 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 50,000 | [1] | 0 | [1]
Derivative, Fixed Interest Rate | 2.78% | [1] |  |
Fair value | 1,095 | [1] | 0 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.910% Interest Rate Swap Maturing February 1, 2017 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 50,000 | [1] | 0 | [1]
Derivative, Fixed Interest Rate | 2.91% | [1] |  |
Fair value | 1,327 | [1] | 0 | [1]
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.090% Interest Rate Swap Maturing October 30, 2019 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | 25,774 | [1] | 0 | [1]
Derivative, Fixed Interest Rate | 3.09% | [1] |  |
Fair value | $ 1,230 | [1] | $ 0 | [1]
[1] | Hedging unsecured variable rate debt.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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