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Revenue from Contract with Customer Revenue from Contract with Customer (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 374,970 $ 279,311
Other operating sales and revenues 4,749 5,311
Sales and other operating revenues 379,719 284,622
Tobacco sales [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 345,137 257,221
Processing revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 21,707 13,354
Other sales and revenue from contracts with customers [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 8,126 $ 8,736