Equity Investment RailAmerica Condensed Consolidated Statement of Comprehensive Income (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	Dec. 28, 2012 RailAmerica [Member]
Net income	$ 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
Other comprehensive income/(loss):
Foreign currency translation adjustment									(62,532,000)	5,451,000		(2,150,000)
Actuarial gain associated with pension and postretirement benefit plans, net of tax provision of $53												166,000
Pension & postretirement benefits - tax (benefit)/provision									208,000	(72,000)	(24,000)	53,000
Other comprehensive loss									41,182,000	(9,376,000)		(1,984,000)
Comprehensive income									$ 230,114,000	$ 61,809,000	$ 117,265,000	$ 13,822,000