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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income taxes computed at federal statutory rate $ 9,801 $ 10,228 $ 5,912
State income taxes, net of federal benefit 1,294 1,880 152
Foreign taxes 311 150 (1,077)
Nondeductible expenses 1,108 954 642
Domestic production activity deduction 0 0 (98)
Research and development tax credit (2,324) (480) (641)
Foreign tax credit (57) (346) 0
Valuation allowance (5) 0 (791)
Tax reform deferred tax remeasurement 0 81 (1,294)
Deferred tax liability true up 1,065 0 (2,180)
Uncertain tax positions 665 172 0
Other (964) 546 (262)
Total provision for income tax $ 10,894 $ 13,185 $ 363