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Goodwill And Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2012
Goodwill And Intangible Assets  
Changes In Carrying Amount Of Goodwill
   Three Months Ended Six Months Ended
   June 30, June 30,
   2012 2011 2012 2011
              
Balance, beginning of period  $ 1,240,422 $ 899,984 $ 1,229,298 $ 894,497
Goodwill acquired, including post acquisition adjustments    -   65,077   11,911   75,240
Disposals    -   (91)   (787)   (4,767)
              
 Balance, end of period  $ 1,240,422 $ 964,970 $ 1,240,422 $ 964,970
Summary Of Amortizable Intangible Assets
     June 30, 2012 December 31, 2011
     Gross        Gross       
     Carrying Accumulated    Carrying Accumulated   
     Amount Amortization  Net Amount Amortization  Net
                      
Deferred financing cost  $ 8,285 $ (2,373) $ 5,912 $ 6,541 $ (1,838) $ 4,703
Agreements, contracts and other intangible assets   3,448   (2,137)   1,311   3,448   (2,026)   1,422
                      
   Total amortizable intangible assets  $ 11,733 $ (4,510) $ 7,223 $ 9,989 $ (3,864) $ 6,125