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Warranties
 12 Months Ended
Dec. 31, 2017
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 or service its products 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,
 
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