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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS
Description
 
Balance at
Beginning
of Year
 
Additions
Charged to
Expenses (Income)
 
Charge-Offs
 
Other(1)
 
Balance at
End of Year
Allowance for doubtful accounts:
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2016
 
7,919

 
6,653

 
(6,514
)
 
1

 
8,059

Year ended December 31, 2017
 
8,059

 
(2,203
)
 
(1,839
)
 
22

 
4,039

Year ended December 31, 2018
 
4,039

 
123

 
(454
)
 
16

 
3,724

Valuation allowance for deferred income tax assets:
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2016
 
6,317

 
451

 
—

 
(607
)
 
6,161

Year ended December 31, 2017
 
6,161

 
(2,578
)
 
—

 
1,206

 
4,789

Year ended December 31, 2018
 
4,789

 
—

 
—

 
—

 
4,789

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(1) Primarily the impact of currency changes