Leases Schedule of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Total finance lease cost	$ 2,735	$ 5,434
Total operating lease cost	26,567	52,334
Total lease cost	29,302	57,768
Depreciation and Amortization [Member]
Amortization of right-of-use assets, Finance leases	1,888	3,761
Interest Expense [Member]
Interest on lease liability, Finance leases	847	1,673
Equipment Rents and Trackage Rights [Member]
Operating lease cost	22,533	44,684
Short-term lease cost	2,566	4,993
Variable lease cost	2,995	4,907
Operating Revenues [Member]
Sublease income (gross basis)	$ (1,527)	$ (2,250)