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INCOME TAXES - Schedule of effective tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
INCOME TAXES    
Statutory federal tax rate 21.00% 21.00%
State income taxes, net of federal tax benefit 3.30% 1.80%
Non-taxable municipal bond interest (0.30%) 1.30%
Net Operating Loss Carryback Under the CARES Act   10.40%
Foreign income tax rate differences 1.60% (24.30%)
Reversal of deferred tax assets on foreign net operating losses   (28.40%)
Share-based compensation 0.50% (1.00%)
Other (1.30%) (1.10%)
Earnings (loss) before provision (benefit) for income taxes $ 27,345 $ (7,054)
Provision (benefit) for income taxes $ 6,790 $ 1,431
Effective tax rate 24.80% (20.30%)