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STATEMENTS OF CASH FLOWS DATA - Supplemental Investing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental investing activities:
Net unrealized gain (loss) on marketable securities	$ 315	$ 24	$ (154)
Operating lease assets obtained in exchange for operating lease liabilities	$ 2,473

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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