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Warranty (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Product Warranties Disclosures [Abstract]    
Changes in warranty reserve
The changes in warranty reserves for the nine months ended September 30, 2017 and 2016 were as follows:
 
Nine Months Ended
 
September 30
 
2017
 
2016
Beginning balance
$
10,960

 
$
10,093

Additions charged to expense
8,879

 
8,888

Acquired warranty obligations
384

 
—

Foreign currency fluctuations
225

 
85

Claims paid
(8,912
)
 
(8,707
)
Ending balance
$
11,536

 
$
10,359
The changes in warranty reserves for the three years ended December 31 were as follows:
 
2016
 
2015
 
2014
Beginning balance
$
10,093

 
$
9,686

 
$
9,663

Product warranty provision
12,413

 
11,719

 
10,605

Acquired Warranty Obligations
42

 
—

 
—

Foreign currency
82

 
(207
)
 
(215
)
Claims paid
(11,670
)
 
(11,105
)
 
(10,367
)
Ending balance
$
10,960

 
$
10,093

 
$
9,686