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Marketable Securities (Amortized Cost And Fair Value Of Marketable Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 236,995 | $ 213,804
Gross Unrealized Gains | 70 | 25
Gross Unrealized Losses | (116) | (238)
Fair Value | 236,949 | 213,591
Marketable securities have been in a continuous unrealized loss position for more than twelve months | 0 |
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 | 130,833 | 177,810
Gross Unrealized Gains | 40 | 24
Gross Unrealized Losses | (102) | (221)
Fair Value | 130,771 | 177,613
Certificates Of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 40,400 | 3,500
Fair Value | 40,400 | 3,500
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 27,290 |
Gross Unrealized Gains | 25 |
Fair Value | 27,315 |
Markerable Securities - Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,228 | 3,491
Fair Value | 20,228 | 3,491
U S Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 12,244 | 12,881
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (14) | (10)
Fair Value | 12,231 | 12,871
Agency Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,600 | 12,068
Gross Unrealized Gains | 4 |
Gross Unrealized Losses |  | (3)
Fair Value | 4,604 | 12,065
International Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,462
Gross Unrealized Losses |  | (3)
Fair Value |  | 1,459
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,400 | 1,400
Gross Unrealized Losses |  | (1)
Fair Value | $ 1,400 | 1,399
Treasury Bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,192
Gross Unrealized Gains |  | 1
Fair Value |  | $ 1,193

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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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