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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Schedule II - Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II
Valuation and Qualifying Accounts (in thousands); Years Ended December 31, 2011, 2010, 2009

Valuation Accounts Deducted in the Balance Sheet From the Assets to Which They Apply
 
Balance at Beginning of Period
  
Additions Charged to Costs and Expenses
  
Additions Recorded During Acquisitions
  
Deductions
(A)
  
Balance at End of Period
 
                 
2009
               
Allowance for losses:
 $4,295  $1,264  $0  $2,132  $3,427 
Trade accounts receivable
                    
                      
2010
                    
Allowance for losses:
 $3,427  $1,326  $0  $754  $3,999 
Trade accounts receivable
                    
                      
2011
                    
Allowance for losses:
 $3,999  $747  $0  $1,158  $3,588 
Trade accounts receivable
                    

(A) Accounts written off, net of recoveries.