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Marketable Securities (Amortized Cost And Fair Value Of Marketable Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 239,963 | $ 236,995
Gross Unrealized Gains | 83 | 70
Gross Unrealized Losses | (113) | (116)
Fair Value | 239,933 | 236,949
Marketable securities that we consider to be other-than-temporarily impaired | 0 |
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 120,898 | 130,833
Gross Unrealized Gains | 76 | 40
Gross Unrealized Losses | (81) | (102)
Fair Value | 120,893 | 130,771
Certificates Of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 43,198 | 40,400
Fair Value | 43,198 | 40,400
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 37,610 | 27,290
Gross Unrealized Gains | 6 | 25
Gross Unrealized Losses | (16) |
Fair Value | 37,600 | 27,315
Commercial Paper - Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 17,013 | 20,228
Fair Value | 17,013 | 20,228
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,644 | 12,244
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (15) | (14)
Fair Value | 16,630 | 12,231
Agency Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,600 | 4,600
Gross Unrealized Gains |  | 4
Gross Unrealized Losses | (1) |
Fair Value | $ 4,599 | 4,604
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,400
Fair Value |  | $ 1,400

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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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