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Basis of Presentation and Summary of Significant Accounting Policies (Investment Categories) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Summary of investment categories
Amortized cost	$ 167,057	$ 120,758
Gross unrealized gains	2,518	1,564
Gross unrealized losses	(55)	(26)
Estimated fair value	169,520	122,296
Bank deposits
Summary of investment categories
Amortized cost	77,307	40,715
Gross unrealized gains	12	19
Gross unrealized losses	(5)	0
Estimated fair value	77,314	40,734
Corporate bonds
Summary of investment categories
Amortized cost	50,833	11,031
Gross unrealized gains	3	0
Gross unrealized losses	(34)	(5)
Estimated fair value	50,802	11,026
Commercial paper
Summary of investment categories
Amortized cost	23,176	33,074
Gross unrealized gains	3	2
Gross unrealized losses	(2)	(9)
Estimated fair value	23,177	33,067
U.S. Government bonds
Summary of investment categories
Amortized cost	8,490	7,508
Gross unrealized gains	2	0
Gross unrealized losses	(6)	(1)
Estimated fair value	8,486	7,507
Agency bonds
Summary of investment categories
Amortized cost	4,977	7,294
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Estimated fair value	4,977	7,295
Municipal Bonds
Summary of investment categories
Amortized cost	2,020	19,624
Gross unrealized gains	0	0
Gross unrealized losses	(8)	(11)
Estimated fair value	2,012	19,613
Corporate equity securities
Summary of investment categories
Amortized cost	254	1,512
Gross unrealized gains	2,498	1,542
Gross unrealized losses	0	0
Estimated fair value	$ 2,752	$ 3,054

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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