Product Warranty Costs (Tables)
 3 Months Ended
Mar. 31, 2015
Reconciliation of Changes in Product Warranty Liability
A reconciliation of the changes in the Company’s product warranty liability is as follows (in thousands): 
 
Three Months Ended March 31,
 
2015
 
2014
Balance at the beginning of the period
$
2,614

 
$
3,090

Warranty expense
467

 
693

Warranty claims settled
(420
)
 
(683
)
Balance at the end of the period
$
2,661

 
$
3,100

 
As of
 
March 31,
2015
 
December 31,
2014
Composition of balance:
 
 
 
Short-term
$
975

 
$
981

Long-term
1,686

 
1,633

 
$
2,661

 
$
2,614