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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Derivative Instruments [Abstract]  
Effects of changes in the fair values of derivatives designated as cash flow hedges on the accompanying Condensed Consolidated Statements of Comprehensive Income
                         
     Location on    

            Three Months Ended

March 31

 
in thousands   Statement     2012     2011  

Cash Flow Hedges

                       

Loss reclassified from AOCI
(effective portion)

   
 
Interest
expense
  
  
        (1,575         (1,995