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Warranties
 12 Months Ended
Dec. 31, 2021
Guarantees [Abstract]  
Warranties Warranties
The Company has warranties with various terms from 18 months for parts, data center cooling solutions, and cleanroom systems 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 Ended December 31,
 202120202019
Warranty accrual:(in thousands)
Balance, beginning of period$13,522 $12,652 $11,421 
Payments made(6,734)(5,751)(6,816)
Provisions6,351 6,621 8,047 
Assumed in business combination (Note 4)
630 — — 
     Balance, end of period$13,769 $13,522 $12,652 
Warranty expense:$6,351 $6,621 $8,047