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Business Combinations (Tables)
3 Months Ended
Mar. 31, 2012
Business Combinations [Abstract]  
Acquisitions Accounted For As Business Combinations
Estimated Fair Values Of The Aggregate Assets And Liabilities Acquired
Results Of Operations
Estimated Acquisition Earn-Out Payables

(in thousands)

   2012     2011  

Balance as of January 1

   $ 47,715      $ 29,608   

Additions to estimated acquisition earn-out payables

     4,714        8,941   

Payments for estimated acquisition earn-out payables

     (133     (358

Net change in earnings from estimated acquisition earn-out payables:

    

Change in fair value on estimated acquisition earn-out payables

     (970     (515

Interest expense accretion

     582        416   
  

 

 

   

 

 

 

Net change in earnings from estimated acquisition earn-out payables

     (388     (99
  

 

 

   

 

 

 

Balance as of March 31

   $ 51,908      $ 38,092