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Warranties (Tables)
3 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Changes in accrued product warranties
 
Three Months Ended March 31,
 
2018
 
2017
Balances at beginning of period
$
2,312

 
$
2,329

Warranty liabilities acquired
92

 

Increases to accruals
178

 
2,181

Warranty expenditures
(506
)
 
(389
)
Effect of changes in exchange rates
8

 
5

Balances at end of period
$
2,084

 
$
4,126