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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
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