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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Short term investments, available-for-sale securities at fair value | $ 429 | $ 350
Accounts receivable, allowance for expected credit losses | 0 | 0
Long Term Investments, available-for-sale securities Fair Value | $ 29,129 | $ 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 | 49,133,000 | 49,063,000
Treasury stock, shares | 30,519,000 | 30,590,000

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