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Significant Accounting Policies, Concentrations of Credit Risk (Details) - Revenue [Member]
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Comcast [Member]        
Concentration Risk [Line Items]        
Customer concentration risk (in hundredths) 69.00% 61.00% 68.00% 59.00%
Office Depot [Member]        
Concentration Risk [Line Items]        
Customer concentration risk (in hundredths) 13.00% 16.00% 14.00% 18.00%