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Marketable Securities (Fair Value to Amortized Cost) (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost basis	$ 4,756	[1]
Available-for-sale securities, unrealized gains	0
Available-for-sale securities, unrealized losses	(20)
Available-for-sale marketable securities, fair value	4,736	[1]
Purchased and accrued interest	6
Current Assets | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost basis	4,756	[1]
Available-for-sale securities, unrealized gains	0
Available-for-sale securities, unrealized losses	(20)
Available-for-sale marketable securities, fair value	$ 4,736	[1]
[1] Included in amortized cost and fair value is purchased and accrued interest of $6

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Available-for-sale Securities, Purchased and accrued interest

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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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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