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Warranties (Tables)
 9 Months Ended
Sep. 30, 2014
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
Nine months ended
 
September 30,
2014
 
September 30,
2013
 
September 30,
2014
 
September 30,
2013
Warranty accrual:
(in thousands)
 
 
 
 
Balance, beginning of period
$
7,775

 
$
6,766

 
$
7,352

 
$
5,776

Payments made
(1,159
)
 
(1,477
)
 
(3,294
)
 
(3,394
)
Provisions
1,645

 
2,238

 
4,203

 
5,145

Balance, end of period
$
8,261

 
$
7,527

 
$
8,261

 
$
7,527

 
 
 
 
 
 
 
 
Warranty expense:
$
1,645

 
$
2,289

 
$
4,203

 
$
5,332