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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-For-Sale Securities |  |
Amortized Cost | $ 63,378 | $ 71,485
Gross Unrealized Gain | 283 | 277
Gross Unrealized (Losses) | (229) | (255)
Estimated Fair Value | 63,432 | 71,507
Corporate debt securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 34,457 | 42,584
Gross Unrealized Gain | 62 | 165
Gross Unrealized (Losses) | (160) | (40)
Estimated Fair Value | 34,359 | 42,709
Tax-exempt municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 23,321 | 23,301
Gross Unrealized Gain | 221 | 112
Gross Unrealized (Losses) | (69) | (215)
Estimated Fair Value | 23,473 | 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

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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