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Investments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Investments
Investments - Trading	$ 3,006	$ 3,006	$ 10,840
Available-for-sale investments
Adjusted Cost	41,651	41,651
Gross Unrealized Gains		41
Gross Unrealized (Losses)		(283)
Estimated Fair Value	41,409	41,409
Unrealized gains on available-for-sale securities, net of tax	(65)	(185)
Credit losses for our available-for-sale debt securities	0	0
Corporate bonds
Available-for-sale investments
Adjusted Cost	34,344	34,344
Gross Unrealized Gains		41
Gross Unrealized (Losses)		(281)
Estimated Fair Value	34,104	34,104
Commercial paper
Available-for-sale investments
Adjusted Cost	3,997	3,997
Estimated Fair Value	3,997	3,997
Municipal securities
Available-for-sale investments
Adjusted Cost	2,108	2,108
Estimated Fair Value	2,108	2,108
Asset-backed securities
Available-for-sale investments
Adjusted Cost	1,202	1,202
Gross Unrealized (Losses)		(2)
Estimated Fair Value	$ 1,200	$ 1,200

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