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Warranties
 12 Months Ended
Dec. 31, 2018
Guarantees [Abstract]  
Warranties
Warranties

The Company has warranties with various terms from 18 months for parts to 25 years for certain heat exchangers. The Company has an obligation to replace parts if conditions under the warranty are met. A provision is made for estimated warranty costs at the time the related products are sold based upon the warranty period, historical trends, new products and any known identifiable warranty issues.  

Changes in the warranty accrual are as follows:
 
Years Ending December 31,
 
2018
 
2017
 
2016
Warranty accrual:
(in thousands)
Balance, beginning of period
$
10,483

 
$
7,936

 
$
8,469

Payments made
(7,869
)
 
(8,686
)
 
(4,134
)
Provisions
9,669

 
11,233

 
3,601

Change in estimate
(862
)
 
—

 
—

     Balance, end of period
$
11,421

 
$
10,483

 
$
7,936

 
 
 
 
 
 
Warranty expense:
$
8,807

 
$
11,233

 
$
3,601


The change in estimate relates to the Company’s failure rate calculation. In reviewing claims data, the Company noted specific claims that were the result of an isolated incident and not representative of the Company’s historical performance or representative of expected future claims. As such, these claims were accounted for as a specific accrual for warranty liability and excluded from our failure rate that the Company utilizes in estimating future claims.