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Warranties (Tables)
6 Months Ended
Jun. 30, 2016
Product Warranties Disclosures [Abstract]  
Changes in accrued product warranties
Changes in our product warranty accrual is as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
Balances at beginning of period
 
$
1,750

 
$
1,556

 
$
1,633

 
$
1,612

Increases to accruals related to sales during the period
 
541

 
255

 
937

 
439

Warranty expenditures
 
(335
)
 
(346
)
 
(614
)
 
(576
)
Effect of changes in currency exchange rates
 
(23
)
 
11

 
(23
)
 
1

Balances at end of period
 
$
1,933

 
$
1,476

 
$
1,933

 
$
1,476