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Marketable Securities - Available-For-Sale Securities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Available-For-Sale Securities
Amortized Cost	$ 75,060,000
Gross Unrealized Gain	57,000
Gross Unrealized (Losses)	(318,000)
Estimated Fair Value	74,799,000	$ 0
Corporate debt securities
Available-For-Sale Securities
Amortized Cost	48,202,000
Gross Unrealized Gain	12,000
Gross Unrealized (Losses)	(284,000)
Estimated Fair Value	47,930,000
Tax-exempt municipal securities
Available-For-Sale Securities
Amortized Cost	22,858,000
Gross Unrealized Gain	45,000
Gross Unrealized (Losses)	(34,000)
Estimated Fair Value	22,869,000
Variable rate demand notes
Available-For-Sale Securities
Amortized Cost	4,000,000
Estimated Fair Value	$ 4,000,000

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- 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).

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