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13. Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Product 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
Product warranty liability, beginning of period
 
$
239,701

 
$
250,371

 
$
252,408

 
$
231,751

Accruals for new warranties issued
 
8,048

 
6,158

 
18,334

 
26,854

Settlements
 
(2,867
)
 
(2,814
)
 
(6,783
)
 
(9,246
)
Changes in estimate of product warranty liability
 
(1,188
)
 
1,169

 
(20,265
)
 
5,525

Product warranty liability, end of period
 
$
243,694

 
$
254,884

 
$
243,694

 
$
254,884

Current portion of warranty liability
 
$
31,016

 
$
37,552

 
$
31,016

 
$
37,552

Noncurrent portion of warranty liability
 
$
212,678

 
$
217,332

 
$
212,678

 
$
217,332