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Basis of Presentation (Investment Categories) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Summary of investment categories |  |
Amortized cost | $ 62,705 | $ 3,440
Gross unrealized gains | 11,277 | 4,954
Gross unrealized losses | (11) | 0
Estimated fair value | 73,971 | 8,394
Bank deposits |  |
Summary of investment categories |  |
Amortized cost | 38,174 |
Gross unrealized gains | 3 |
Gross unrealized losses | (3) |
Estimated fair value | 38,174 |
Corporate bonds |  |
Summary of investment categories |  |
Amortized cost | 5,115 |
Gross unrealized gains | 0 |
Gross unrealized losses | (5) |
Estimated fair value | 5,110 |
Commercial paper |  |
Summary of investment categories |  |
Amortized cost | 3,498 |
Gross unrealized gains | 0 |
Gross unrealized losses | 0 |
Estimated fair value | 3,498 |
Asset backed securities |  |
Summary of investment categories |  |
Amortized cost | 13,330 |
Gross unrealized gains | 0 |
Gross unrealized losses | (3) |
Estimated fair value | 13,327 |
Corporate equity securities |  |
Summary of investment categories |  |
Amortized cost | 1,988 | 2,179
Gross unrealized gains | 11,274 | 4,954
Gross unrealized losses | 0 | 0
Estimated fair value | 13,262 | 7,133
Restricted investments |  |
Summary of investment categories |  |
Amortized cost | 600 | 1,261
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 600 | $ 1,261

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- Definition 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=28360136&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 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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