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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Changes in Allowance for Doubtful Accounts

For the years ended December 31, 2018, 2017 and 2016, changes in the allowance for doubtful accounts were as follows (in thousands):

 

 

2018

 

 

2017

 

 

2016

 

Balance at beginning of year

$

554

 

 

$

565

 

 

$

500

 

Provision charged to selling, general and administrative expenses

 

66

 

 

 

283

 

 

 

135

 

Allowance resulting from acquisitions

 

—

 

 

 

52

 

 

 

15

 

Write-offs, net of recoveries of amounts previously reserved

 

(295

)

 

 

(358

)

 

 

(82

)

Exchange rate changes

 

(4

)

 

 

12

 

 

 

(3

)

Balance at end of year

$

321

 

 

$

554

 

 

$

565