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Warranties (Tables)
6 Months Ended
Jun. 30, 2018
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
Six months ended
 
June 30,
2018
 
June 30,
2017
 
June 30,
2018
 
June 30,
2017
Warranty accrual:
(in thousands)
Balance, beginning of period
$
10,788

 
$
7,812

 
$
10,483

 
$
7,936

Payments made
(2,504
)
 
(2,312
)
 
(3,723
)
 
(3,654
)
Provisions
3,174

 
3,102

 
4,698

 
4,320

Balance, end of period
$
11,458

 
$
8,602

 
$
11,458

 
$
8,602

 
 
 
 
 
 
 
 
Warranty expense:
$
3,174

 
$
3,102

 
$
4,698

 
$
4,320