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Marketable Securities (Amortized Cost and Fair Value of Marketable Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |
Recognized loss | $ 300 |
Amortized Cost |  | $ 284,429
Gross Unrealized Gains |  | 120
Gross Unrealized Losses |  | (294)
Fair Value |  | 284,255
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 140,969
Gross Unrealized Gains |  | 96
Gross Unrealized Losses |  | (179)
Fair Value |  | 140,886
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 58,510
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 58,510
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 29,171
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 29,171
Asset backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 22,206
Gross Unrealized Gains |  | 4
Gross Unrealized Losses |  | (43)
Fair Value |  | 22,167
U.S. government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 15,619
Gross Unrealized Gains |  | 11
Gross Unrealized Losses |  | (19)
Fair Value |  | 15,611
Agency bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 10,990
Gross Unrealized Gains |  | 9
Gross Unrealized Losses |  | (52)
Fair Value |  | 10,947
Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 6,964
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Value |  | $ 6,963

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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