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Warranty Reserve (Tables)
 12 Months Ended
Dec. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of Activity in the Warranty Reserve
The following is a summary of the activity in the warranty reserve:
 
2017
 
2016
 
2015
 
(Amounts in thousands)
Balance — January 1
$
30,459

 
$
34,574

 
$
31,095

Accruals for warranty expense, net of adjustments
35,001

 
28,364

 
33,113

Settlements made
(31,859
)
 
(32,479
)
 
(29,634
)
Balance — December 31
$
33,601

 
$
30,459

 
$
34,574