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10. Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Product warranty activities during the three months ended March 31, 2019 and 2018 were as follows (in thousands):
 
 
Three Months Ended
March 31,
 
 
2019
 
2018
Product warranty liability, beginning of period
 
$
220,692

 
$
224,274

Accruals for new warranties issued
 
5,116

 
3,632

Settlements
 
(3,078
)
 
(2,609
)
Changes in estimate of product warranty liability
 
(5,489
)
 
503

Product warranty liability, end of period
 
$
217,241

 
$
225,800

Current portion of warranty liability
 
$
31,013

 
$
32,655

Noncurrent portion of warranty liability
 
$
186,228

 
$
193,145