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SEGMENT AND GEOGRAPHICAL REPORTING, Geographical Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Revenues $ 1,247,043 $ 1,499,662 $ 1,241,510
Property and equipment, net 68,503 69,979  
Reportable Geographical Components [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,119,210 1,300,493 1,075,962
Property and equipment, net 53,695 49,013  
Reportable Geographical Components [Member] | Canada [Member]      
Segment Reporting Information [Line Items]      
Revenues 127,833 195,633 165,548
Property and equipment, net 14,724 20,966  
Reportable Geographical Components [Member] | Dubai [Member]      
Segment Reporting Information [Line Items]      
Property and equipment, net 84 0  
Reportable Geographical Components [Member] | Other [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 0 $ 3,536 $ 0