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Risk Management and Use of Financial Instruments Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 51,548 | $ 51,548
Derivative, Fair Value, Net | 175 | (2,391)
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 377,062 | 377,062
Derivative, Fair Value, Net | (3,089) | (11,819)
3.300% Interest Rate Swap Maturing January 30, 2021 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 25,774 | 25,774
Derivative, Fixed Interest Rate | 3.30% |
Derivative, Fair Value, Net | 154 | (1,262)
3.090% Interest Rate Swap Maturing October 30, 2019 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 25,774 | 25,774
Derivative, Fixed Interest Rate | 3.09% |
Derivative, Fair Value, Net | 21 | (1,129)
3.623% Interest Rate Swap Maturing February 1, 2019 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 200,000 | 200,000
Derivative, Fixed Interest Rate | 3.623% |
Derivative, Fair Value, Net | (1,506) | (8,859)
2.703% Interest Rate Swap Maturing February 1, 2016 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 77,000 | 77,000
Derivative, Fixed Interest Rate | 2.703% |
Derivative, Fair Value, Net | (798) | (1,343)
2.470% Interest Rate Swap Maturing February 1, 2015 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 50,000 | 50,000
Derivative, Fixed Interest Rate | 2.47% |
Derivative, Fair Value, Net | (328) | (458)
2.513% Interest Rate Swap Maturing May 1, 2015 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 23,000 | 23,000
Derivative, Fixed Interest Rate | 2.513% |
Derivative, Fair Value, Net | (174) | (245)
2.750% Interest Rate Swap Maturing September 30, 2017 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 27,062 | 27,062
Derivative, Fixed Interest Rate | 2.75% |
Derivative, Fair Value, Net | $ (283) | $ (914)

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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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 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 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: 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 + 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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