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Risk Management and Use of Financial Instruments (Fair Values of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 16, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Other Assets [Member] | Dec. 31, 2013 Other Assets [Member] | Sep. 30, 2014 Other Liabilities [Member] | Dec. 31, 2013 Other Liabilities [Member] | Sep. 30, 2014 Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Assets [Member] | Dec. 31, 2013 Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Assets [Member] | Sep. 16, 2014 Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Sep. 30, 2014 3.300% Interest Rate Swap Maturing January 30, 2021 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Assets [Member] | Dec. 31, 2013 3.300% Interest Rate Swap Maturing January 30, 2021 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Assets [Member] | Sep. 30, 2014 3.090% Interest Rate Swap Maturing October 30, 2019 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Assets [Member] | Dec. 31, 2013 3.090% Interest Rate Swap Maturing October 30, 2019 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Assets [Member] | Sep. 30, 2014 3.623% Interest Rate Swap Maturing February 1, 2019 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Dec. 31, 2013 3.623% Interest Rate Swap Maturing February 1, 2019 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Sep. 30, 2014 2.703% Interest Rate Swap Maturing February 1, 2016 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Dec. 31, 2013 2.703% Interest Rate Swap Maturing February 1, 2016 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Sep. 30, 2014 2.470% Interest Rate Swap Maturing February 1, 2015 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Dec. 31, 2013 2.470% Interest Rate Swap Maturing February 1, 2015 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Sep. 30, 2014 2.513% Interest Rate Swap Maturing May 1, 2015 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Dec. 31, 2013 2.513% Interest Rate Swap Maturing May 1, 2015 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Sep. 30, 2014 2.750% Interest Rate Swap Maturing September 30, 2017 [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Other Liabilities [Member] | Dec. 31, 2013 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Maturities Repayments Of Principal |  | $ 2,721,460 |  | $ 2,721,460 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount |  |  |  |  |  |  |  | 227,062 | 377,062 |  |  |  |  |  |  |  | 200,000 | 200,000 | 0 | 77,000 | 0 | 50,000 | 0 | 23,000 | 27,062 | 27,062
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  | 3.09% |  | 3.623% |  | 2.703% |  | 2.47% |  | 2.513% |  | 2.75% |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement |  |  |  |  |  |  |  |  |  | 91 | 767 |  | 68 | 549 | 23 | 218 |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,243) | (545) | 0 | (887) | 0 | (283) | 0 | (162) | (181) | (311)
Derivative Asset, Notional Amount |  |  |  |  |  | 51,548 | 51,548 |  |  |  |  |  | 25,774 | 25,774 | 25,774 | 25,774 |  |  |  |  |  |  |  |  |  |
Derivative, Fair Value, Net |  |  |  |  |  |  |  | (1,424) | (2,188) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized hedge activity | $ 800 | $ (828) | $ 0 | $ (828) | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 + 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=35750535&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=35750535&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 Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 + Details
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