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Major Customers - Sales to Unaffiliated Customers (Details) - Sales
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Customer A      
Revenue, Major Customer [Line Items]      
Major customer percentage 21.00% 3.00% 0.00%
Customer B      
Revenue, Major Customer [Line Items]      
Major customer percentage 14.00% 16.00% 37.00%
Customer C      
Revenue, Major Customer [Line Items]      
Major customer percentage 1.00% 2.00% 24.00%
Customer D      
Revenue, Major Customer [Line Items]      
Major customer percentage 0.00% 11.00% 8.00%
Customer E      
Revenue, Major Customer [Line Items]      
Major customer percentage 0.00% 15.00% 0.00%