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Valuation and Qualifying Accounts (Note)
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Valuation and Qualifying Accounts

Accounts receivable balances are stated net of allowance for doubtful accounts. Historically, the Company has not experienced significant write-offs. The Company records allowances for doubtful accounts when it is probable that the accounts receivable balance will not be collected. The following table provides a summary of the allowance for doubtful accounts balances and activity for the years ended December 31, 2013, 2012 and 2011:

 
 
Year Ended December 31,
(in thousands)
 
2013
 
2012
 
2011
Beginning balance-allowance for doubtful accounts
 
$
21,512

 
$
14,787

 
$
14,924

Additions-charged to expense
 
7,007

 
9,201

 
5,046

Amounts written off
 
(6,068
)
 
(2,889
)
 
(6,058
)
Other (primarily changes in foreign currency exchange rates)
 
(372
)
 
413

 
875

Ending balance-allowance for doubtful accounts
 
$
22,079

 
$
21,512

 
$
14,787