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Investments (Summary Of Short-term Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Short-term investments, Cost Basis	$ 12,648	$ 22,822
Short-term investment, Unrealized gains (losses)	(6)	(21)
Short-term investments, Fair value	12,642	22,801
Corporate Bonds [Member]
Investment [Line Items]
Short-term investments, Cost Basis	2,925	8,284
Short-term investment, Unrealized gains (losses)	(5)	(8)
Short-term investments, Fair value	2,920	8,276
U.S. Government Agencies and Securities [Member]
Investment [Line Items]
Short-term investments, Cost Basis	3,000	8,542
Short-term investment, Unrealized gains (losses)	(1)	(13)
Short-term investments, Fair value	2,999	8,529
Commercial Paper [Member]
Investment [Line Items]
Short-term investments, Cost Basis	6,723	5,996
Short-term investments, Fair value	$ 6,723	$ 5,996

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Cost of the investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.Column C.3,4)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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