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Commitments, Contingencies and Other Commitments, Contingencies and Other (Table 2) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sales Revenue, Net [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   12.00% 12.20%
Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.60% 16.90% 16.70%
Concentration Risk, Customer 0.134