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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, 2013 and 2012:

 
 
Year Ended December 31,
(in thousands)
 
2014
 
2013
 
2012
Beginning balance-allowance for doubtful accounts
 
$
22,079

 
$
21,512

 
$
14,787

Additions-charged to expense
 
11,156

 
7,007

 
9,201

Amounts written off
 
(10,573
)
 
(6,068
)
 
(2,889
)
Other (primarily changes in foreign currency exchange rates)
 
(2,116
)
 
(372
)
 
413

Ending balance-allowance for doubtful accounts
 
$
20,546

 
$
22,079

 
$
21,512