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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014:

 
 
Year Ended December 31,
(in thousands)
 
2016
 
2015
 
2014
Beginning balance-allowance for doubtful accounts
 
$
19,140

 
$
20,546

 
$
22,079

Additions-charged to expense
 
6,556

 
8,209

 
11,156

Amounts written off
 
(6,839
)
 
(7,862
)
 
(10,573
)
Other (primarily changes in foreign currency exchange rates)
 
(488
)
 
(1,753
)
 
(2,116
)
Ending balance-allowance for doubtful accounts
 
$
18,369

 
$
19,140

 
$
20,546