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Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]          
Number of customers     530    
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Customer with Highest Net Accounts Receivable Position [Member]          
Concentration Risk [Line Items]          
Number of customers     1 1  
Concentration risk, percentage of total 12.00% 19.00%      
Revenue [Member] | Customer Concentration Risk [Member] | Ten Largest Customers [Member]          
Concentration Risk [Line Items]          
Number of customers     10 10 10
Concentration risk, percentage of total     61.00% 66.00% 71.00%