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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Marketable securities - available for sale	$ 32,754	$ 25,917
Assets - fair value	32,754	25,917
Level 1
Assets:
Marketable securities - available for sale	0	0
Assets - fair value	0	0
Level 2
Assets:
Marketable securities - available for sale	32,754	25,917
Assets - fair value	32,754	25,917
Level 3
Assets:
Marketable securities - available for sale	0	0
Assets - fair value	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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