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Warranties (Tables)
 12 Months Ended
Dec. 31, 2014
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:

 
Years Ending December 31,
 
2014
 
2013
 
2012
Warranty accrual:
(in thousands)
Balance, beginning of period
$
7,352

 
$
5,776

 
$
6,093

Payments made
(4,096
)
 
(4,448
)
 
(3,861
)
Provisions
4,874

 
6,005

 
3,304

Adjustments related to changes in estimates
—

 
19

 
240

Balance, end of period
$
8,130

 
$
7,352

 
$
5,776

 
 
 
 
 
 
Warranty expense:
$
4,874

 
$
6,024

 
$
3,545