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Goodwill And Intangible Assets
12 Months Ended
Dec. 31, 2012
Goodwill And Intangible Assets  
Goodwill And Intangible Assets

5. Goodwill and Intangible Assets

 

The changes in the carrying amount of goodwill for the years ended December 31, 2012 and 2011 are as follows (in thousands):

 

  2012 2011
       
Balance, beginning of period $ 1,229,298 $ 894,497
Goodwill acquired, including post acquisition adjustments   429,504   344,089
Disposals   (6,800)   (9,288)
       
 Balance, end of period $ 1,652,002 $ 1,229,298

Amortizable intangible assets at December 31, 2012 and 2011 consisted of the following (in thousands):

     2012 2011
     Gross        Gross       
     Carrying Accumulated    Carrying Accumulated   
     Amount Amortization  Net Amount Amortization  Net
                      
Deferred financing cost  $ 14,523 $ (3,029) $ 11,494 $ 6,541 $ (1,838) $ 4,703
Agreements, contracts and other intangible assets   3,448   (2,250)   1,198   3,448   (2,026)   1,422
                      
   Total amortizable intangible assets  $ 17,971 $ (5,279) $ 12,692 $ 9,989 $ (3,864) $ 6,125

Amortization of intangible assets for the years ended December 31, 2012, 2011 and 2010 was $1,415,000, $1,472,000 and $1,184,000, respectively. Deferred financing costs increased approximately $6,200,000 related to the issuance of the senior unsecured notes. Estimated amortization of intangible assets for the five years and thereafter subsequent to December 31, 2012, with a weighted average amortization period of 5.8 years, is $2,329,000, $2,324,000, $2,323,000, $2,323,000, $1,508,000 and $1,885,000.

 

At December 31, 2012 and 2011, other non-amortizable intangible assets related to restrictive covenant arrangements were $9,825,000 and $9,300,000, respectively.