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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Rollforward of Allowance for Doubtful Accounts
The following is a roll forward of our allowance for doubtful accounts as of December 31:
(amounts in thousands)
2019
 
2018
 
2017
Balance as of January 1,
$
(6,227
)
 
$
(4,468
)
 
$
(3,763
)
Acquisitions (Note 2)
(235
)
 
(1,668
)
 
(268
)
Additions charged to expense
(961
)
 
(2,769
)
 
(1,731
)
Deductions
1,407

 
2,301

 
1,662

Currency translation
49

 
377

 
(368
)
Balance at period end
$
(5,967
)
 
$
(6,227
)
 
$
(4,468
)