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Commitments And Contingencies (Narrative) (Details) number in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Number of domain names registered | 124.0 |  |
Uncertain tax positions | $ 211,000,000 |  |
Net cash provided by operating activities | $ 651,482,000 | $ 600,949,000 | $ 579,397,000
ICANN Agreement [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Expiration Date of Registry Agreement | November 30, 2018 |  |
Registry fee per transaction | $ 0.25 |  |
Payments for registry fees | 30,900,000 | 28,400,000 | 27,900,000
.TV Agreement [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
renewed agreement fees | $ 5,000,000 | $ 4,500,000 | $ 4,500,000

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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. + 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 inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of cash paid during the current period for fees which are not defined elsewhere in the taxonomy. + 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=31042434&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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- Details
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- Details
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