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Warranties (Tables)
 3 Months Ended
Mar. 31, 2019
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
Three months ended
 
March 31,
2019
 
March 31,
2018
Warranty accrual:
(in thousands)
Balance, beginning of period
$
11,421

 
$
10,483

Payments made
(1,106
)
 
(1,222
)
Provisions
1,109

 
1,527

Balance, end of period
$
11,424

 
$
10,788

 
 
 
 
Warranty expense:
$
1,109

 
$
1,527