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Other Comprehensive Income Loss (The Effect Of The Reclassifications From Other Comprehensive Loss To Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustments, Before Tax $ (147) $ (600)
Foreign currency translation adjustments, Tax 0 0
Foreign currency translation adjustments, Net of Tax (147) (600)
Unrealized gains (losses) on available-for-sale securities (72) 140
Unrealized gains (losses) on available-for-sale securities, Before Tax (72) 140
Unrealized gains (losses) on available-for-sale securities, Tax (15) 30
Unrealized gains (losses) on available-for-sale securities, Net of Tax (57) 110
Total other comprehensive income (loss) before income taxes (219) (460)
Other comprehensive income (loss), Tax 15 (30)
Total other comprehensive loss after income taxes $ (204) $ (490)