Amtrak Agreement (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012 Amtrak Agreement [Member]	Sep. 30, 2012 Amtrak Agreement [Member]	Sep. 30, 2012 License Arrangement [Member] Amtrak Agreement [Member]	Sep. 30, 2012 Track Material [Member] Amtrak Agreement [Member]	Sep. 30, 2012 Mileage Charges Freight [Member] Amtrak Agreement [Member]	Sep. 30, 2012 Inter Entity Outstanding Adjustment [Member] Amtrak Agreement [Member]
Amtrak Agreement (Textual) [Abstract]
Dispute settlement gross amount	$ 2,424		$ 2,571			$ 5,578	$ (179)	$ (684)	$ (2,571)	$ (2,143)
Recorded Revenue					3,006
Remaining revenue relates to credit against mileage charges payable to Amtrak					$ 0