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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
Sep. 30, 2013
Dec. 31, 2012
Other Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 25,774 $ 25,774
Derivative, Fair Value, Net 112 (1,262)
Other Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 402,836 402,836
Derivative, Fair Value, Net (4,314) (12,948)
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 112 (1,262)
3.090% Interest Rate Swap Maturing October 30, 2019 [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 25,774 25,774
Derivative, Fixed Interest Rate 3.09%  
Derivative, Fair Value, Net (85) (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 (2,369) (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 (942) (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 (327) (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 (181) (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 $ (410) $ (914)