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Significant Accounting Policies (Investment Categories) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Summary of investment categories |  |
Amortized cost | $ 78,923 | $ 97,891
Gross unrealized gains | 2,988 | 4,944
Gross unrealized losses | (3) | (44)
Estimated fair value | 81,908 | 102,791
Bank deposits |  |
Summary of investment categories |  |
Amortized cost | 42,376 | 43,043
Gross unrealized gains | 87 | 0
Gross unrealized losses | 0 | (4)
Estimated fair value | 42,463 | 43,039
Corporate bonds |  |
Summary of investment categories |  |
Amortized cost | 24,268 | 41,238
Gross unrealized gains | 84 | 0
Gross unrealized losses | (2) | (35)
Estimated fair value | 24,350 | 41,203
Commercial paper |  |
Summary of investment categories |  |
Amortized cost | 8,401 | 1,747
Gross unrealized gains | 2 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 8,403 | 1,747
Asset backed securities |  |
Summary of investment categories |  |
Amortized cost | 2,067 | 10,020
Gross unrealized gains | 1 | 0
Gross unrealized losses | (1) | (5)
Estimated fair value | 2,067 | 10,015
Corporate equity securities |  |
Summary of investment categories |  |
Amortized cost | 1,811 | 1,843
Gross unrealized gains | 2,814 | 4,944
Gross unrealized losses | 0 | 0
Estimated fair value | $ 4,625 | $ 6,787

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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=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 -Subparagraph (aa) -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 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&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=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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