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Product Warranty (Tables)
 6 Months Ended
Jun. 30, 2018
Product Warranties Disclosures [Abstract]  
Schedule of warranty obligation for accrued warranty expense
The activity related to the Company’s warranty obligation for accrued warranty expense was as follows:
 
 
Three months ended June 30,
 
Six months ended June 30,
(in thousands)
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
4,148

 
$
3,764

 
$
3,823

 
$
3,526

Provision
1,561

 
1,234

 
2,756

 
2,320

Claims paid/costs incurred
(1,666
)
 
(1,226
)
 
(2,579
)
 
(2,127
)
Foreign currency translation
(105
)
 
7

 
(62
)
 
60

Balance at end of period
$
3,938


$
3,779


$
3,938


$
3,779