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Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
2013
 
2012
 
2013
 
2012
Balance at beginning of period
$
40,941

 
$
40,430

 
$
47,723

 
$
44,355

Additions to warranty reserve through acquisitions
1,602

 
—

 
1,602

 
—

Additions charged to expense
13,154

 
8,647

 
21,990

 
17,039

Warranty claims paid
(12,980
)
 
(10,392
)
 
(28,598
)
 
(22,709
)
Balance at end of period
$
42,717

 
$
38,685

 
$
42,717

 
$
38,685