Amtrak Agreement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of remaining track mileage credit
Mileage credit available	$ 2,424		$ 2,571
Utilized	173		320
Mileage credit remaining	$ 2,251		$ 2,251