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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available-For-Sale Securities |  |
Amortized Cost | $ 50,372 | $ 71,485
Gross Unrealized Gain | 760 | 277
Gross Unrealized (Losses) | (12) | (255)
Estimated Fair Value | 51,120 | 71,507
Corporate debt securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 22,865 | 42,584
Gross Unrealized Gain | 485 | 165
Gross Unrealized (Losses) | 0 | (40)
Estimated Fair Value | 23,350 | 42,709
Tax-exempt municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 21,907 | 23,301
Gross Unrealized Gain | 275 | 112
Gross Unrealized (Losses) | (12) | (215)
Estimated Fair Value | 22,170 | 23,198
Variable rate demand notes |  |
Available-For-Sale Securities |  |
Amortized Cost | 5,600 | 5,600
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | $ 5,600 | $ 5,600

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