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Warranty Obligations
 6 Months Ended
Jun. 30, 2013
Product Warranties Disclosures [Abstract]  
WARRANTY OBLIGATIONS
WARRANTY OBLIGATIONS
Changes in the Company’s warranty obligations during the six months ended June 30, 2013 and 2012 were as follows (in thousands):
 
Six Months Ended
June 30,
 
2013
 
2012
Balance, at beginning of period
$
21,338

 
$
8,738

Warranty expense
8,124

 
3,698

Settlements
(2,685
)
 
(1,024
)
Balance, at end of period
26,777

 
11,412

Less current portion included in accrued liabilities
(7,987
)
 
(2,220
)
Long-term portion
$
18,790

 
$
9,192


For the three and six months ended June 30, 2013, warranty expense included $2.7 million and $4.7 million, respectively, resulting from changes in estimates, arising from increased failure rates related to certain previous generation products, lower warranty claim rates and higher estimated replacement costs for certain products.
For the three and six months ended June 30, 2012, warranty expense included $0.9 million and $1.2 million, respectively, resulting from changes in estimates related to higher estimated replacement costs for certain products.