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Shared-Based Compensation And Share Repurchase Plans (Schedule Of Restricted Stock Units Issued And Vested) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Value of options, Unvested | $ 223,885 | $ 851,552 | $ 1,030,691
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options, Granted | 236,291 |  |
Number of options, Vesting | 92,295 |  |
Number of options, Unvested | 143,996 |  |
Value of options, Granted | $ 3,506,679 |  |
Value of options, Vesting | 1,261,777 |  |
Value of options, Unvested | $ 2,244,902 |  |
Restricted Stock Units (RSUs) [Member] | 2016 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options, Granted | 68,153 |  |
Number of options, Vesting | 51,650 |  |
Number of options, Unvested | 16,503 |  |
Value of options, Granted | $ 815,160 |  |
Value of options, Vesting | 613,208 |  |
Value of options, Unvested | $ 201,952 |  |
Restricted Stock Units (RSUs) [Member] | 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options, Granted |  | 70,538 |
Number of options, Vesting |  | 40,645 |
Number of options, Unvested |  | 29,893 |
Value of options, Granted |  | $ 1,124,348 |
Value of options, Vesting |  | 648,569 |
Value of options, Unvested |  | $ 475,779 |
Restricted Stock Units (RSUs) [Member] | 2018 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options, Granted | 97,600 |  |
Number of options, Unvested | 97,600 |  |
Value of options, Granted | $ 1,567,171 |  |
Value of options, Unvested | $ 1,567,171 |  |

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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value, Granted + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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 Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + References No definition available. + Details
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