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Major Customers (Details) - subsidiary
1 Months Ended 3 Months Ended
Jan. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Concentration Risk [Line Items]      
Number of subsidiaries in transition agreements 2    
Credit Concentration Risk | Sales Revenue, Goods, Net      
Concentration Risk [Line Items]      
Concentration risk (as a percent) (more than for 10.0%)   13.10% 20.80%