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12. Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Product warranty activities during the three and nine months ended September 30, 2015 and 2014 were as follows (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2015
 
2014
 
2015
 
2014
Product warranty liability, beginning of period
 
$
222,304

 
$
210,827

 
$
223,057

 
$
198,041

Accruals for new warranties issued
 
16,700

 
9,832

 
34,948

 
29,343

Settlements
 
(4,722
)
 
(5,057
)
 
(9,817
)
 
(12,634
)
Changes in estimate of product warranty liability
 
(1,212
)
 
(1,256
)
 
(15,118
)
 
(404
)
Product warranty liability, end of period
 
$
233,070

 
$
214,346

 
$
233,070

 
$
214,346

Current portion of warranty liability
 
$
48,311

 
$
68,021

 
$
48,311

 
$
68,021

Noncurrent portion of warranty liability
 
$
184,759

 
$
146,325

 
$
184,759

 
$
146,325