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Warranty Reserve (Tables)
 12 Months Ended
Dec. 31, 2014
Product Warranties Disclosures [Abstract]  
Schedule of Activity in the Warranty Reserve
The following is a summary of the activity in the warranty reserve:
 
2014
 
2013
 
2012
 
(Amounts in thousands)
Balance — January 1
$
37,828

 
$
35,400

 
$
38,033

Accruals for warranty expense, net of adjustments
24,909

 
33,504

 
28,851

Settlements made
(31,642
)
 
(31,076
)
 
(31,484
)
Balance — December 31
$
31,095

 
$
37,828

 
$
35,400