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Warranties (Tables)
 9 Months Ended
Sep. 30, 2016
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
Nine months ended
 
September 30,
2016
 
September 30,
2015
 
September 30,
2016
 
September 30,
2015
Warranty accrual:
(in thousands)
Balance, beginning of period
$
8,454

 
$
8,092

 
$
8,469

 
$
8,130

Payments made
(1,331
)
 
(1,130
)
 
(2,988
)
 
(3,133
)
Provisions
1,012

 
1,289

 
2,654

 
3,254

Balance, end of period
$
8,135

 
$
8,251

 
$
8,135

 
$
8,251

 
 
 
 
 
 
 
 
Warranty expense:
$
1,012

 
$
1,289

 
$
2,654

 
$
3,254