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Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | $ 578,610 |  | $ 452,836 |
Fair value | 14,519 |  | 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]
Strike | 0.03623 | [1] |  |
Fair value | 7,600 | [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]
Strike | 0.02702 | [1] |  |
Fair value | 1,803 | [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]
Strike | 0.02470 | [1] |  |
Fair value | 385 | [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]
Strike | 0.02513 | [1] |  |
Fair value | 207 | [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]
Strike | 0.02750 | [1] |  |
Fair value | 704 | [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]
Strike | 0.033 | [1] |  |
Fair value | 1,126 | [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]
Strike | 0.0278 | [1] |  |
Fair value | 801 | [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]
Strike | 0.02910 | [1] |  |
Fair value | 969 | [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]
Strike | 0.03090 | [1] |  |
Fair value | $ 924 | [1] | $ 0 | [1]
[1] | Hedging unsecured variable rate debt.

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- Definition Monetary 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 + Details
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- Definition Fair value as of the balance sheet date 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 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611 Reference 2: 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 3: 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 4: 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=6947722&loc=d3e13433-108611 + Details
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- Definition The strike price on the price risk option contract such as a put option or a call option. + References No definition available. + Details
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- Details
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