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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2020
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the years ended
​ | ​ | December 31, 2020, 2019 and 2018
​ | ​ | Balance at | ​ | Charged to | ​ | ​ | ​ | Balance
​ | ​ | Beginning | ​ | Costs and | ​ | Net (Deductions) | ​ | at End of
(in thousands) | ​ | of Period | ​ | Expenses | ​ | Recoveries | ​ | Period
Year ended December 31, 2020 | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Credit loss allowance for accounts receivable | ​ | $ | 5,181 | ​ | $ | 342 | ​ | $ | (708) | (1) | $ | 4,815
Deferred tax asset valuation allowance | ​ | $ | 471 | ​ | $ | — | ​ | $ | 19 | (2) | $ | 490
Reserve for obsolete or slow moving inventory | ​ | $ | 10,467 | ​ | $ | 5,826 | ​ | $ | (2,464) | (3) | $ | 13,829
Year ended December 31, 2019 | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Credit loss allowance for accounts receivable | ​ | $ | 4,813 | ​ | $ | 1,481 | ​ | $ | (1,113) | (1) | $ | 5,181
Deferred tax asset valuation allowance | ​ | $ | 445 | ​ | $ | — | ​ | $ | 26 | (2) | $ | 471
Reserve for obsolete or slow moving inventory | ​ | $ | 10,169 | ​ | $ | 6,467 | ​ | $ | (6,169) | (3) | $ | 10,467
Year ended December 31, 2018 | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Credit loss allowance for accounts receivable | ​ | $ | 4,471 | ​ | $ | 588 | ​ | $ | (246) | (1) | $ | 4,813
Deferred tax asset valuation allowance | ​ | $ | 3,994 | ​ | $ | — | ​ | $ | (3,549) | (2) | $ | 445
Reserve for obsolete or slow moving inventory | ​ | $ | 3,875 | ​ | $ | 8,088 | ​ | $ | (1,794) | (3) | $ | 10,169
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(1) | Net (deductions) recoveries in the credit loss allowance principally reflect the write-off of previously reserved accounts net of recoveries.
(2) | The valuation allowance for deferred tax assets is increased or decreased each year to reflect the net operating losses, foreign tax credits and capital losses that management believes will not be utilized before they expire.
(3) | Net (deductions) recoveries in the reserve for obsolete or slow moving inventory principally reflect the write-off and/ or disposal of previously reserved inventory.

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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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- References No definition available. + Details
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