Annual report pursuant to Section 13 and 15(d)

Valuation and qualifying accounts (Details)

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Valuation and qualifying accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at the beginning of the year $ 2,929 $ 1,487 $ 871
Additions charged to earnings 67 1,081 1,361
Changes to net (26) 361 (745)
Balance at the end of the year 2,970 2,929 1,487
Valuation of deferred tax assets      
Valuation and qualifying accounts      
Balance at the beginning of the year 3,374 1,612 1,473
Changes to net (101) 1,762 139
Balance at the end of the year $ 3,273 $ 3,374 $ 1,612