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Commitments And Contingencies (Narrative) (Details) number in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Number of domain names registered | 131.9 |  |
Uncertain tax positions | $ 217,000,000 |  |
ICANN Agreement [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Expiration Date of Registry Agreement | Nov. 30, 2024 |  |
Registry fee per transaction | $ 0.25 |  |
Payments for registry fees | 32,300,000 | $ 31,500,000 | $ 30,900,000
.TV Agreement [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
renewed agreement fees | $ 5,000,000 | $ 5,000,000 | $ 5,000,000

X
- Definition Amount recognized for uncertainty in income taxes classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash outflow for fees classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
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- Definition Expiration Date of Registry Agreement + References No definition available. + Details
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- Definition Total fees associated with the renewed agreement + References No definition available. + Details
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- Definition Number of domain names registered + References No definition available. + Details
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- Definition Registry fee per transaction + References No definition available. + Details
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- Details
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- Details
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