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Basis of Presentation and Significant Accounting Policies (Investment Categories) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Summary of investment categories
Amortized cost	$ 34,528	$ 97,891
Gross unrealized gains	3,018	4,944
Gross unrealized losses	(11)	(44)
Estimated fair value	37,535	102,791
Bank deposits
Summary of investment categories
Amortized cost	11,999	43,043
Gross unrealized gains	9	0
Gross unrealized losses	(2)	(4)
Estimated fair value	12,006	43,039
Corporate bonds
Summary of investment categories
Amortized cost	6,014	41,238
Gross unrealized gains	31	0
Gross unrealized losses	0	(35)
Estimated fair value	6,045	41,203
Commercial paper
Summary of investment categories
Amortized cost	13,096	1,747
Gross unrealized gains	4	0
Gross unrealized losses	(9)	0
Estimated fair value	13,091	1,747
Asset backed securities
Summary of investment categories
Amortized cost	63	10,020
Gross unrealized gains	0	0
Gross unrealized losses	0	(5)
Estimated fair value	63	10,015
Municipal Bonds
Summary of investment categories
Amortized cost	1,778
Gross unrealized gains	13
Gross unrealized losses	0
Estimated fair value	1,791
Corporate equity securities
Summary of investment categories
Amortized cost	1,578	1,843
Gross unrealized gains	2,961	4,944
Gross unrealized losses	0	0
Estimated fair value	$ 4,539	$ 6,787

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Topic 320
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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