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(Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Unrealized gain (loss) on investments, tax $ 0 $ 0 $ 0
Noncash Titan Europe Plc gain, tax 0 0 0
Pension liaiblity adjustments, tax $ 39 $ 43 $ 133