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Segment Information Gross Profit by Segment and Category (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | $ 309,425 | $ 293,268 | $ 946,943 | $ 928,747
North America [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 207,908 | 201,661 | 662,705 | 634,778
International [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 101,517 | 91,607 | 284,238 | 293,969
Local [Member] | North America [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 162,914 | 152,873 | 511,865 | 475,703
Local [Member] | International [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 67,860 | 59,257 | 189,357 | 186,448
Goods [Member] | North America [Member] | Third party and other [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 3,205 | 1,509 | 7,719 | 5,201
Goods [Member] | North America [Member] | Direct [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 27,729 | 30,022 | 96,141 | 104,571
Goods [Member] | International [Member] | Third party and other [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 3,639 | 5,698 | 11,800 | 23,249
Goods [Member] | International [Member] | Direct [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 21,096 | 14,274 | 54,127 | 50,168
Travel [Member] | North America [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | 14,060 | 17,257 | 46,980 | 49,303
Travel [Member] | International [Member] |  |  |  |
Gross Profit by Category [Line Items] |  |  |  |
Gross Profit | $ 8,922 | $ 12,378 | $ 28,954 | $ 34,104

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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