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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2011
Derivative Financial Instruments [Abstract]  
Fair values of derivative instruments recorded in Balance Sheet
                                                                 
    Asset Derivatives     Liability Derivatives  
    June 30, 2011     December 31,2010     June 30, 2011     December 31, 2010  
    Balance             Balance             Balance             Balance        
Derivatives designed as   Sheet     Fair     Sheet     Fair     Sheet     Fair     Sheet     Fair  
hedging instruments   Location     Value     Location     Value     Location     Value     Location     Value  
                 
Interest rate swaps
            —               —     Cash flow hedges   $ 5,552     Cash flow hedges   $ 6,807  
 
                                                       
 
          $ —             $ —             $ 5,552             $ 6,807  
 
                                                       
Derivatives in fair value and cash flow hedging relationships
                                         
                    Location of Gain or (Loss)   Amount of Gain or (Loss)
    Amount of Gain or (Loss)   Reclassified from   Reclassified from
Derivatives in cash flow   Recognized in OCI on   Accumulated OCI into   Accumulated OCI into
hedging relationships   Derivative   Income   Income
    Six Months Ended June 30,           Six Months Ended June 30,
    2011   2010           2011   2010
    (in thousands)           (in thousands)
Interest rate contracts
  $ (676 )   $ (3,202 )   Interest expense   $ (1,540 )   $ (1,317 )
                                         
    Three Months Ended June 30,           Three Months Ended June 30,
    2011   2010           2011   2010
    (in thousands)           (in thousands)
Interest rate contracts
  $ (578 )   $ (1,552 )   Interest expense     $(787 )     $(657 )