Subsequent Events Pinsly (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended			3 Months Ended
	May 31, 2014	Oct. 02, 2012	Jan. 05, 2015 employee locomotive carload mile	Mar. 31, 2015
Subsequent Event [Line Items]
Business Acquisition, Name of Acquired Entity	Rapid City, Pierre & Eastern Railroad, Inc. (RCP&E)	RailAmerica, Inc.
Pinsly Arkansas Division [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Business Acquisition, Name of Acquired Entity			Pinsly's Arkansas Division
Business Acquisition, Effective Date of Acquisition			Jan. 05, 2015
Cash consideration				$ 40,000
Track miles acquired			137
Employees expected to hire			77
Number of locomotives purchased			16
Estimated annual carloads			35,000