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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments $ 0 $ 181 $ 149