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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
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 Year | Additions Charged to Statement of Income Accounts |  | Other (1) | Deductions | Balance at End of Year
(in thousands) |  |  |  |  |  |
Allowance for credit losses on accounts receivable |  |  |  |  |
Year ended December 31, 2020 | 396 |  | 1,767 |  | (2) | — |  | 670 |  | 1,493 |
Year ended December 31, 2019 | 79 |  | 244 |  |  | 148 |  | 75 |  | 396 |
Valuation allowance for deferred tax assets |  |  |  |  |  |
Year ended December 31, 2020 | 1,165 |  | 6,761 |  | (3) | — |  | — |  | 7,926 |
Year ended December 31, 2019 | 107 |  | 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.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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