Equity Investment Equity Investment (Details) (USD $)	3 Months Ended								12 Months Ended				3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 02, 2012 RailAmerica [Member]	Dec. 28, 2012 RailAmerica [Member]	Dec. 31, 2012 RailAmerica [Member]
Business acquisition, percentage of voting interests acquired												100.00%
Business acquisition, share price												$ 27.50
Income from equity investment in RailAmerica, net									$ 0	$ 15,557,000	$ 0		$ 15,600,000
Net income available to RailAmerica, Inc.	58,088,000	66,225,000	65,050,000	82,728,000	13,396,000	(19,567,000)	36,363,000	22,241,000	272,091,000	52,433,000	119,484,000		15,806,000
Equity investment intercompany elimination													200,000
After-tax impact of RailAmerica integration and acquisition-related costs	$ 600,000	$ 1,300,000	$ 700,000	$ 8,000,000	$ 17,700,000	$ 3,100,000	$ 500,000							$ 3,500,000