Property and Equipment and Leases (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,840,940,000	$ 2,008,179,000
Depreciation expense	66,600,000	59,700,000	44,600,000
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	93,000	19,000
Bridges/tunnels/culverts
Property, Plant and Equipment [Line Items]
Total property and equipment	3,500,000	841,000
Track property
Property, Plant and Equipment [Line Items]
Total property and equipment	24,252,000	4,158,000
Locomotives and rail cars
Property, Plant and Equipment [Line Items]
Total property and equipment	39,291,000	62,340,000
Other equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	2,369,000	830,000
Total construction-in-process
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 69,505,000	$ 68,188,000