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Warranties (Tables)
 9 Months Ended
Sep. 30, 2018
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
Nine months ended
 
September 30,
2018
 
September 30,
2017
 
September 30,
2018
 
September 30,
2017
Warranty accrual:
(in thousands)
Balance, beginning of period
$
11,458

 
$
8,602

 
$
10,483

 
$
7,936

Payments made
(2,355
)
 
(2,281
)
 
(6,078
)
 
(5,935
)
Provisions
3,050

 
3,277

 
7,748

 
7,597

Balance, end of period
$
12,153

 
$
9,598

 
$
12,153

 
$
9,598

 
 
 
 
 
 
 
 
Warranty expense:
$
3,050

 
$
3,277

 
$
7,748

 
$
7,597