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Warranties (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Change in the Company's warranty reserve
The overall change in the Company's warranty reserve is reflected on the consolidated balance sheets in accrued expenses and taxes and is detailed as follows: 
 
Years Ended December 31,
 
2015
 
2014
 
2013
 
(in thousands)
Liability, beginning of year
$
953

 
$
1,385

 
$
1,374

Provision for warranties issued during the year, net of adjustments
1,235

 
1,263

 
1,453

Adjustments to warranties issued during previous years
(16
)
 
(261
)
 
(788
)
Warranty claims
(757
)
 
(1,434
)
 
(654
)
Liability, end of year
$
1,415

 
$
953

 
$
1,385