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Warranties (Tables)
 3 Months Ended
Mar. 31, 2018
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 
 
Three months ended
 
March 31,
2018
 
March 31,
2017
Warranty accrual:
(in thousands)
Balance, beginning of period
$
10,483

 
$
7,936

Payments made
(1,222
)
 
(1,342
)
Provisions
1,527

 
1,218

Balance, end of period
$
10,788

 
$
7,812

 
 
 
 
Warranty expense:
$
1,527

 
$
1,218