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Reserves for Credit Losses (Tables)
 9 Months Ended
Sep. 30, 2016
Receivables [Abstract]  
Changes in Reserves for Credit Losses Related to Accounts Receivable
The following table presents changes in reserves for credit losses related to accounts receivable:
 
Nine months ended September 30,
 
2016
 
2015
Balance, beginning of period
$
13,832

 
$
13,919

Provision for credit losses
19,849

 
14,532

Charge-offs
(24,825
)
 
(20,667
)
Recoveries of amounts previously charged-off
4,980

 
3,965

Currency translation
151

 
(214
)
Balance, end of period
$
13,987

 
$
11,535