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Warranties (Tables)
 12 Months Ended
Dec. 31, 2017
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:

 
Years Ending December 31,
 
2017
 
2016
 
2015
Warranty accrual:
(in thousands)
Balance, beginning of period
$
7,936

 
$
8,469

 
$
8,130

Payments made
(8,686
)
 
(4,134
)
 
(3,978
)
Provisions
11,233

 
3,601

 
4,317

Balance, end of period
$
10,483

 
$
7,936

 
$
8,469

 
 
 
 
 
 
Warranty expense:
$
11,233

 
$
3,601

 
$
4,317