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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Short term investments, available-for-sale securities at fair value	$ 1,731	$ 5,201
Allowance for doubtful accounts	38	38
Long Term Investments, available-for-sale securities Fair Value	$ 43,385	$ 32,459
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	48,241,000	48,020,000
Treasury stock, shares	31,280,000	31,638,000

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