Revenue from Contracts with Customers Revenue from Contract with Customer (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 2,213,126	$ 2,018,924	$ 2,047,382
Sales and other operating revenues	$ 671,723	$ 636,107	$ 539,604	$ 379,719	$ 607,496	$ 653,581	$ 488,248	$ 284,622	2,227,153	2,033,947	2,071,218
Tobacco sales [Member] [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									2,089,770	1,898,303	1,943,033
Processing revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									85,426	78,042	63,840
Other sales and revenue [Member] [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									37,930	42,579	40,509
Other operating revenues									$ 14,027	$ 15,023	$ 23,836