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Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Investments
Investments - Trading	$ 8,015	$ 10,840
Available-for-sale investments
Adjusted Cost	28,583
Gross Unrealized Gains	9
Gross Unrealized (Losses)	(164)
Estimated Fair Value	28,428
Unrealized gains on available-for-sale securities, net of tax	(120)
Corporate bonds
Available-for-sale investments
Adjusted Cost	19,228
Gross Unrealized Gains	9
Gross Unrealized (Losses)	(158)
Estimated Fair Value	19,079
Commercial paper
Available-for-sale investments
Adjusted Cost	5,991
Gross Unrealized (Losses)	(3)
Estimated Fair Value	5,988
Municipal securities
Available-for-sale investments
Adjusted Cost	1,433
Gross Unrealized (Losses)	(1)
Estimated Fair Value	1,432
Asset-backed securities
Available-for-sale investments
Adjusted Cost	1,931
Gross Unrealized (Losses)	(2)
Estimated Fair Value	$ 1,929

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