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Segment Information (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 349,254 | $ 328,415 | $ 995,343 | $ 967,243
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 274,506 | 270,512 | 799,696 | 793,904
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 30,233 | 29,559 | 92,253 | 94,817
Other Regions [Domain] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 44,515 | $ 28,344 | $ 103,394 | $ 78,522

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + 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(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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