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Warranties (Tables)
 12 Months Ended
Dec. 31, 2014
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,
 
2014
 
2013
 
2012
 
(in thousands)
Liability, beginning of year
$
1,385

 
$
1,374

 
$
930

Provision for warranties issued during the year, net of adjustments
1,263

 
1,453

 
1,318

Adjustments to warranties issued during previous years
(261
)
 
(788
)
 
199

Warranty claims
(1,434
)
 
(654
)
 
(1,073
)
Liability, end of year
$
953

 
$
1,385

 
$
1,374