Leases Schedule of Lease Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finance Lease Cost	$ 2,699
Total operating lease cost	23,096
Lease cost	25,795
Depreciation and Amortization [Member]
Amortization of right-of-use assets, Finance leases	1,873
Interest Expense [Member]
Interest on lease liability, Finance leases	826
Equipment Rents and Trackage Rights [Member]
Operating lease cost	21,760
Short-term lease cost	1,355
Variable lease cost	704
Operating Revenues [Member]
Sublease income (gross basis)	$ (723)