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Valuation and qualifying accounts (Tables) | 12 Months Ended
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Dec. 31, 2020
Valuation and qualifying accounts |
Schedule of valuation and qualifying accounts | The Company’s valuation and qualifying accounts for the years ended December 31, 2020, 2019 and 2018 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Additions | ​ | Changes to | ​ | Balance at
​ | ​ | beginning | ​ | charged to | ​ | reserve, net (1) | ​ | end of year
​ | ​ | of year | ​ | earnings | ​ | ​ | ​ | ​
Year ended December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses | ​ | $ | 1,487 | ​ | $ | 1,081 | ​ | $ | 361 | ​ | $ | 2,929
Valuation of deferred tax assets | ​ | ​ | 1,612 | ​ | ​ | - | ​ | ​ | 1,762 | ​ | ​ | 3,374
Year ended December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses | ​ | $ | 871 | ​ | $ | 1,361 | ​ | $ | (745) | ​ | $ | 1,487
Valuation of deferred tax assets | ​ | ​ | 1,473 | ​ | ​ | - | ​ | ​ | 139 | ​ | ​ | 1,612
Year ended December 31, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses | ​ | $ | 1,056 | ​ | $ | 531 | ​ | $ | (716) | ​ | $ | 871
Valuation of deferred tax assets | ​ | ​ | 777 | ​ | ​ | - | ​ | ​ | 696 | ​ | ​ | 1,473
(1) | Increases (deductions) from the allowance for credit losses equal accounts receivable written off and increases related to acquired businesses, less recoveries, against the allowance. See Note 2 for additional information. Increases (deductions) to the valuation of deferred tax assets relate to the reversals due to changes in management’s judgments regarding the future realization of the underlying deferred tax assets.

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- Definition Tabular disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). + References No definition available. + Details
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- References No definition available. + Details
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