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Business Segment and Geographic Information (Schedule of Geographical Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Revenues $ 26,570 $ 28,887
United States    
Segment Reporting Information [Line Items]    
Revenues 17,553 18,398
Canada    
Segment Reporting Information [Line Items]    
Revenues 8,952 10,474
Others Countries [Member]    
Segment Reporting Information [Line Items]    
Revenues $ 65 $ 15