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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 | Mar. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Long Term Debt Maturities Repayments Of Principal | $ 2,400,130 |
Derivative, Notional Amount | 428,610 | 428,610
Derivative, Fair Value, Net | 12,383 | 14,210
3.623% Interest Rate Swap Maturing February 1, 2019 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 200,000 | 200,000
Derivative, Fair Value, Net | 7,761 | 8,859
Derivative, Fixed Interest Rate | 3.623% |
2.703% Interest Rate Swap Maturing February 1, 2016 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 77,000 | 77,000
Derivative, Fair Value, Net | 1,229 | 1,343
Derivative, Fixed Interest Rate | 2.703% |
2.470% Interest Rate Swap Maturing February 1, 2015 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 50,000 | 50,000
Derivative, Fair Value, Net | 404 | 458
Derivative, Fixed Interest Rate | 2.47% |
2.513% Interest Rate Swap Maturing May 1, 2015 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 23,000 | 23,000
Derivative, Fair Value, Net | 221 | 245
Derivative, Fixed Interest Rate | 2.513% |
2.750% Interest Rate Swap Maturing September 30, 2017 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 27,062 | 27,062
Derivative, Fair Value, Net | 825 | 914
Derivative, Fixed Interest Rate | 2.75% |
3.300% Interest Rate Swap Maturing January 30, 2021 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 25,774 | 25,774
Derivative, Fair Value, Net | 1,003 | 1,262
Derivative, Fixed Interest Rate | 3.30% |
3.090% Interest Rate Swap Maturing October 30, 2019 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 25,774 | 25,774
Derivative, Fair Value, Net | $ 940 | $ 1,129
Derivative, Fixed Interest Rate | 3.09% |

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- Definition Long term-debt maturities repayments of principal. + References No definition available. + Details
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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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