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WARRANTY OBLIGATIONS (Tables)
 9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Summary of Warranty Activities
The Company’s warranty activities during the three and nine months ended September 30, 2017 and 2016 were as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Warranty obligations, beginning of period
$
31,613

 
$
30,066

 
$
31,414

 
$
30,547

Accruals for warranties issued during period
1,009

 
1,194

 
2,913

 
2,931

Changes in estimates
(1,046
)
 
783

 
(826
)
 
1,548

Settlements
(1,494
)
 
(2,561
)
 
(5,092
)
 
(6,517
)
Increase due to accretion expense
549

 
461

 
1,542

 
1,279

Other
(279
)
 
406

 
401

 
561

Warranty obligations, end of period
$
30,352

 
$
30,349

 
$
30,352

 
$
30,349

Less current portion


 


 
$
(7,151
)
 
$
(6,761
)
Noncurrent


 


 
$
23,201

 
$
23,588