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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II - Valuation and Qualifying Accounts    


 Balance at Beginning of YearAdditions Charged to Statement of Income Accounts
Other (1)
DeductionsBalance at End of Year
(in thousands)
Allowance for credit losses on accounts receivable
Year ended December 31, 20211,493 572 — 388 1,677 
Year ended December 31, 2020396 1,767 (2)— 670 1,493 
Year ended December 31, 201979 244 148 75 396 
Valuation allowance for deferred tax assets
Year ended December 31, 20217,926 331 — — 8,257 
Year ended December 31, 20201,165 6,761 (3)— — 7,926 
Year ended December 31, 2019107 1,165 — 107 1,165 
(1) Represents opening allowance balance related to acquisition made during the period indicated.
(2) Increase in 2020 primarily due to allowances booked as a result of the financial impact from the COVID-19 pandemic.
(3) Increase in 2020 primarily due to full valuation allowance established against capital loss DTA in connection with the Prime Turbines stock sale and full valuation allowance against foreign tax loss DTA.