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Warranties
 6 Months Ended
Jun. 30, 2021
Guarantees [Abstract]  
Warranties Warranties
The Company has product warranties with various terms ranging from one year from the date of first use or 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 EndedSix Months Ended
 June 30,
2021		June 30,
2020		June 30,
2021		June 30,
2020
Warranty accrual:(in thousands)
Balance, beginning of period$13,525 $12,940 $13,522 $12,652 
Payments made(1,545)(1,617)(3,009)(2,794)
Provisions2,028 1,837 3,495 3,302 
Balance, end of period$14,008 $13,160 $14,008 $13,160 
Warranty expense:$2,028 $1,837 $3,495 $3,302