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U.S. Government Securities (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gains	$ 6,600,000
Gross unrealized losses	0
Carrying Value
Due in 1 year	5,700,000
Due in 1 to 5 years	132,240,000
U.S Government securities	137,940,000	$ 140,700,000
Fair Value
Due in 1 year	5,800,000
Due in 1 to 5 years	138,769,000
U.S. Government securities	$ 144,569,000

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