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Warranties (Tables)
3 Months Ended
Mar. 31, 2015
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
March 31,
2015
 
March 31,
2014
Warranty accrual:
(in thousands)
Balance, beginning of period
$
8,130

 
$
7,352

Payments made
(886
)
 
(893
)
Provisions
861

 
989

Balance, end of period
$
8,105

 
$
7,448

 
 
 
 
Warranty expense:
$
861

 
$
989