Property and Equipment and Leases Construction in Process (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Construction in-process	$ 42,974	$ 30,395
Buildings and leasehold improvements (subject to term of lease)
Property, Plant and Equipment [Line Items]
Construction in-process	1,312	92
Bridges/tunnels/culverts
Property, Plant and Equipment [Line Items]
Construction in-process	4,082	937
Track property
Property, Plant and Equipment [Line Items]
Construction in-process	24,078	21,912
Locomotives and railcars
Property, Plant and Equipment [Line Items]
Construction in-process	11,170	6,657
Other equipment
Property, Plant and Equipment [Line Items]
Construction in-process	$ 2,332	$ 797