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Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2013
Text Block [Abstract]  
Schedule of activity in the warranty reserve
The activity in the warranty reserve during the periods presented was as follows (in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Balance at beginning of period
$
42,717

 
$
38,685

 
$
47,723

 
$
44,355

Additions to warranty reserve through acquisitions
—

 
—

 
1,602

 
—

Additions charged to expense
16,860

 
12,101

 
38,850

 
29,140

Warranty claims paid
(11,475
)
 
(9,215
)
 
(40,073
)
 
(31,924
)
Balance at end of period
$
48,102

 
$
41,571

 
$
48,102

 
$
41,571