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Derivative and Hedging Activities (Interest Rate Derivatives Designated as Cash Flow Hedges) (USD $)
6 Months Ended
Jun. 30, 2011
Cash flow hedges of interest rate risk [Abstract]  
Amount of AOCI to be reclassified to income in the following 12 months $ 4,700,000
Net realized losses included in AOCI resulting from settled derivative instruments 1,900,000
Consolidated Subsidiaries Interest Rate Swap 1 [Member]
 
Derivative [Line Items]  
Maturity Date Of Derivative Instrument September 2020
Hedge designation cash flow hedge
Description of variable rate basis LIBOR
Type of interest rate paid on swap fixed
Ownership percentage in hedged entity (in hundredths) 95.00%
Notional amount 131,000,000
Swap rate (in hundredths) 2.64%
Credit spread on the loan (in hundredths) 2.35%
Total swapped rate on loan (in hundredths) 4.99%
Period after which principal balance on loan begins amortizing (in years) 2Y
Consolidated Subsidiaries Interest Rate Swap 2 [Member]
 
Derivative [Line Items]  
Maturity Date Of Derivative Instrument January 2012
Unconsolidated Joint Ventures Interest Rate Swap 1 [Member]
 
Derivative [Line Items]  
Maturity Date Of Derivative Instrument November 2012
Hedge designation cash flow hedge
Description of variable rate basis LIBOR
Type of interest rate paid on swap fixed
Ownership percentage in hedged entity (in hundredths) 50.00%
Notional amount $ 30,000,000
Swap rate (in hundredths) 5.05%
Credit spread on the loan (in hundredths) 0.90%
Total swapped rate on loan (in hundredths) 5.95%
Unconsolidated Joint Ventures Interest Rate Swap 2 [Member]
 
Derivative [Line Items]  
Maturity Date Of Derivative Instrument April 2012