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U.S. Government Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
U.S. Government Securities	$ 145,000	$ 146,900
Gross unrealized gain	2,900
Carrying Value
Debt Securities, Available-for-sale [Line Items]
Due in 1 year	4,274
Due in 1 year through 5 years	140,718
Total	144,992
Fair Value
Debt Securities, Available-for-sale [Line Items]
Due in 1 year	4,281
Due in 1 year through 5 years	143,632
Total	$ 147,913

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