Amtrak Agreement (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended					1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Amtrak Agreement [Member]	Jun. 30, 2012 Nonsoftware License Arrangement [Member] Amtrak Agreement [Member]	Jun. 30, 2012 Track Material [Member] Amtrak Agreement [Member]	Jun. 30, 2012 Mileage Charges Freight [Member] Amtrak Agreement [Member]	Jun. 30, 2012 Mileage Charges Freight [Member] Amtrak Agreement [Member]	Jun. 30, 2012 Inter Entity Outstanding Adjustment [Member] Amtrak Agreement [Member]
Amtrak Agreement (Textual) [Abstract]
Dispute Settlement Gross Amount	$ 2,571		$ 2,571		$ 5,578	$ (179)	$ (684)		$ (2,571)	$ (2,143)
Recoveries of related operating expenses								$ 3,006