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REVENUE - Revenue by Geographic Areas (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic revenue | $ 256,357 | $ 203,263 | $ 196,779 | $ 235,182 | $ 254,605 | $ 190,957 | $ 186,596 | $ 256,309 | $ 891,581 | [1] | $ 888,467 | [1] | $ 762,229 | [1]
Geographic revenue percentage |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  | 100.00% |
U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic revenue |  |  |  |  |  |  |  |  | $ 469,987 |  | $ 505,415 |  | $ 447,673 |
Geographic revenue percentage |  |  |  |  |  |  |  |  | 52.00% |  | 56.00% |  | 59.00% |
Other Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic revenue |  |  |  |  |  |  |  |  | $ 53,239 |  | $ 41,467 |  | $ 41,607 |
Geographic revenue percentage |  |  |  |  |  |  |  |  | 6.00% |  | 5.00% |  | 5.00% |
U.K. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic revenue |  |  |  |  |  |  |  |  | $ 95,628 |  | $ 97,000 |  | $ 98,624 |
Geographic revenue percentage |  |  |  |  |  |  |  |  | 11.00% |  | 11.00% |  | 13.00% |
Other EMEA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic revenue |  |  |  |  |  |  |  |  | $ 147,248 |  | $ 138,752 |  | $ 97,113 |
Geographic revenue percentage |  |  |  |  |  |  |  |  | 17.00% |  | 16.00% |  | 13.00% |
Asia-Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic revenue |  |  |  |  |  |  |  |  | $ 125,479 |  | $ 105,833 |  | $ 77,212 |
Geographic revenue percentage |  |  |  |  |  |  |  |  | 14.00% |  | 12.00% |  | 10.00% |
[1] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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