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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Short term investments, available-for-sale securities at fair value $ 1,773 $ 350
Accounts receivable, allowance for expected credit losses 0 0
Long Term Investments, available-for-sale securities Fair Value $ 27,499 $ 29,717
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 79,652,000 79,652,000
Common stock, shares outstanding 49,126,000 49,063,000
Treasury stock, shares 30,526,000 30,590,000