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Segment Information (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 337,047 | $ 336,606 | $ 646,089 | $ 638,828
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 272,992 | 271,375 | 525,190 | 523,392
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 33,614 | 35,432 | 62,020 | 65,258
Other Regions [Domain] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 30,441 | $ 29,799 | $ 58,879 | $ 50,178

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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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