XML 78 R40.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, 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, 2019, 2018 and 2017:

 
 
Year Ended December 31,
(in thousands)
 
2019
 
2018
 
2017
Beginning balance-allowance for doubtful accounts
 
$
24,287

 
$
20,958

 
$
18,369

Additions-charged to expense
 
10,095

 
8,653

 
6,631

Amounts written off
 
(6,179
)
 
(4,079
)
 
(5,944
)
Other (primarily changes in foreign currency exchange rates)
 
(265
)
 
(1,245
)
 
1,902

Ending balance-allowance for doubtful accounts
 
$
27,938

 
$
24,287

 
$
20,958