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Warranties (Tables)
 12 Months Ended
Dec. 31, 2013
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:

 
Years Ending December 31,
 
2013
 
2012
 
2011
Warranty accrual:
(in thousands)
Balance, beginning of period
$
5,776

 
$
6,093

 
$
7,300

Payments made
(4,448
)
 
(3,861
)
 
(5,387
)
Provisions
6,005

 
3,304

 
5,146

Adjustments related to changes in estimates
19

 
240

 
(966
)
Balance, end of period
$
7,352

 
$
5,776

 
$
6,093

 
 
 
 
 
 
Warranty expense:
$
6,024

 
$
3,545

 
$
4,180