Amtrak Agreement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of remaining track mileage credit
Mileage credit available	$ 2,571		$ 2,571
Utilized	147		147
Mileage credit remaining	$ 2,424		$ 2,424