XML 36 R18.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Goodwill and Other Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2011
Goodwill and Other Intangible Assets (Tables) [Abstract]  
Summary of intangible assets
                                         
    Estimated     June 30, 2011     December 31, 2010  
    Life     Gross Carrying     Accumulated     Gross Carrying     Accumulated  
    (Years)     Amount     Amortization     Amount     Amortization  
Customer lists and contracts
    7—10     $ 467,151     $ 447,107     $ 466,412     $ 441,641  
Non-competition agreements
    3—15       63,496       61,414       63,493       60,955  
Site locations
    15       1,378,544       879,652       1,375,298       833,418  
Other
    5—15       13,608       13,089       13,608       13,074  
 
                               
 
            1,922,799       1,401,262     $ 1,918,811     $ 1,349,088  
Unamortizable intangible assets:
                                       
Goodwill
          $ 1,680,461     $ 253,635     $ 1,679,770     $ 253,635