Property and Equipment and Leases Construction in Process (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Construction in-process	$ 31,910	$ 47,044
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Construction in-process	85	2,097
Bridges/tunnels/culverts
Property, Plant and Equipment [Line Items]
Construction in-process	1,600	39
Track property
Property, Plant and Equipment [Line Items]
Construction in-process	12,302	24,962
Locomotives and railcars
Property, Plant and Equipment [Line Items]
Construction in-process	11,786	12,875
Other equipment
Property, Plant and Equipment [Line Items]
Construction in-process	$ 6,137	$ 7,071