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SEGMENT AND GEOGRAPHICAL REPORTING, Geographical Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,499,662 us-gaap_Revenues | $ 1,241,510 us-gaap_Revenues | $ 1,097,110 us-gaap_Revenues
Property and equipment, net | 69,979 us-gaap_PropertyPlantAndEquipmentNet | 58,253 us-gaap_PropertyPlantAndEquipmentNet |
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,300,493 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 1,075,962 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 1,039,712 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Property and equipment, net | 49,013 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 32,878 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 195,633 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | 165,548 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | 57,398 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA
Property and equipment, net | 20,966 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA | 25,375 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA |
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 3,536 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | $ 0 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember | $ 0 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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