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Fair Value Measures (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 190,651 | $ 391,233 | $ 300,910
Total liabilities measured at fair value | 604 | 3,034 | 2,230
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 168,396 | 304,558 | 143,840
Total liabilities measured at fair value | 0 | 0 | 0
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 22,255 | 86,675 | 157,070
Total liabilities measured at fair value | 604 | 3,034 | 2,230
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Total liabilities measured at fair value | 0 | 0 | 0
Accrued Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value | 604 | 2,266 | 2,090
Accrued Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value | 0 | 0 | 0
Accrued Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value | 604 | 2,266 | 2,090
Accrued Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value | 0 | 0 | 0
Other Long Term Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value |  | 768 | 140
Other Long Term Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value |  | 0 | 0
Other Long Term Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value |  | 768 | 140
Other Long Term Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities measured at fair value |  | 0 | 0
Cash Equivalents [Member] | Money Market Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 151,823 |  |
Cash Equivalents [Member] | Money Market Funds [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 151,823 |  |
Cash Equivalents [Member] | Money Market Funds [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 |  |
Cash Equivalents [Member] | Money Market Funds [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 |  |
Cash Equivalents [Member] | US Treasury Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 34,928 |
Cash Equivalents [Member] | US Treasury Securities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Cash Equivalents [Member] | US Treasury Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 34,928 |
Cash Equivalents [Member] | US Treasury Securities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Cash Equivalents [Member] | Commercial Paper [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 33,587 |
Cash Equivalents [Member] | Commercial Paper [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Cash Equivalents [Member] | Commercial Paper [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 33,587 |
Cash Equivalents [Member] | Commercial Paper [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Available-For-Sale Short-Term Investments [Member] | Repurchase Agreements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 136,721
Available-For-Sale Short-Term Investments [Member] | Repurchase Agreements [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 0
Available-For-Sale Short-Term Investments [Member] | Repurchase Agreements [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 136,721
Available-For-Sale Short-Term Investments [Member] | Repurchase Agreements [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 0
Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 288,926 | 130,097
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 288,926 | 130,097
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 | 0
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 | 0
Short-term Investments [Member] | Money Market Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 51 |  |
Short-term Investments [Member] | Money Market Funds [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 51 |  |
Short-term Investments [Member] | Money Market Funds [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 |  |
Short-term Investments [Member] | Money Market Funds [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 |  |
Short-term Investments [Member] | Mutual Fund [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 924 | 1,668 | 1,477
Short-term Investments [Member] | Mutual Fund [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 924 | 1,668 | 1,477
Short-term Investments [Member] | Mutual Fund [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Short-term Investments [Member] | Mutual Fund [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 15,480 | 14,001 | 13,573
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 15,480 | 14,001 | 13,573
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Noncurrent Assets [Member] | Money Market Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 4,173 | 1,792 | 1,312
Other Noncurrent Assets [Member] | Money Market Funds [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 4,173 | 1,792 | 1,312
Other Noncurrent Assets [Member] | Money Market Funds [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Noncurrent Assets [Member] | Money Market Funds [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Noncurrent Assets [Member] | Mutual Fund [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 11,425 | 12,172 | 10,954
Other Noncurrent Assets [Member] | Mutual Fund [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 11,425 | 12,172 | 10,954
Other Noncurrent Assets [Member] | Mutual Fund [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Noncurrent Assets [Member] | Mutual Fund [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Noncurrent Assets [Member] | Derivative Financial Instruments, Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 6,775 | 4,159 | 6,776
Other Noncurrent Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Noncurrent Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 6,775 | 4,159 | 6,776
Other Noncurrent Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 0 | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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