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Segment Information (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Segment Reporting Information [Line Items]        
Number of Reportable Segments     2  
Sales Revenue, Services, Net $ 269,861 $ 248,473 $ 790,497 $ 692,988
Canada [Member]        
Segment Reporting Information [Line Items]        
Sales Revenue, Services, Net $ 300   $ 600