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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Valuation and Qualifying Accounts Disclosure [Table Text Block]
The following table provides a summary of the allowance for doubtful accounts balances and activity for the years ended December 31, 2012, 2011 and 2010:

 
 
Year Ended December 31,
(in thousands)
 
2012
 
2011
 
2010
Beginning balance-allowance for doubtful accounts
 
$
14,787

 
$
14,924

 
$
13,909

Additions-charged to expense
 
9,201

 
5,046

 
6,451

Amounts written off
 
(2,889
)
 
(6,058
)
 
(6,008
)
Other (primarily changes in foreign currency exchange rates)
 
413

 
875

 
572

Ending balance-allowance for doubtful accounts
 
$
21,512

 
$
14,787

 
$
14,924