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Warranties
 6 Months Ended
Jun. 30, 2019
Guarantees [Abstract]  
Warranties  Warranties

The Company has warranties with various terms ranging 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:
 
Three months ended
 
Six months ended
 
June 30,
2019
 
June 30,
2018
 
June 30,
2019
 
June 30,
2018
Warranty accrual:
(in thousands)
Balance, beginning of period
$
11,424

 
$
10,788

 
$
11,421

 
$
10,483

Payments made
(2,071
)
 
(2,504
)
 
(3,177
)
 
(3,723
)
Provisions
2,313

 
3,174

 
3,422

 
4,698

Balance, end of period
$
11,666

 
$
11,458

 
$
11,666

 
$
11,458

 
 
 
 
 
 
 
 
Warranty expense:
$
2,313

 
$
3,174

 
$
3,422

 
$
4,698