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Warranties (Tables)
3 Months Ended
Mar. 31, 2016
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
March 31,
2016
 
March 31,
2015
Warranty accrual:
(in thousands)
Balance, beginning of period
$
8,469

 
$
8,130

Payments made
(653
)
 
(886
)
Provisions
314

 
861

Balance, end of period
$
8,130

 
$
8,105

 
 
 
 
Warranty expense:
$
314

 
$
861