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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-For-Sale Securities |  |
Amortized Cost | $ 37,010 | $ 71,485
Gross Unrealized Gain | 817 | 277
Gross Unrealized (Losses) | 0 | (255)
Estimated Fair Value | 37,827 | 71,507
Corporate debt securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 17,086 | 42,584
Gross Unrealized Gain | 452 | 165
Gross Unrealized (Losses) | 0 | (40)
Estimated Fair Value | 17,538 | 42,709
Tax-exempt municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 19,924 | 23,301
Gross Unrealized Gain | 365 | 112
Gross Unrealized (Losses) | 0 | (215)
Estimated Fair Value | $ 20,289 | 23,198
Variable rate demand notes |  |
Available-For-Sale Securities |  |
Amortized Cost |  | 5,600
Gross Unrealized Gain |  | 0
Gross Unrealized (Losses) |  | 0
Estimated Fair Value |  | $ 5,600

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