Income Taxes (Details 7) (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2009 Capital loss carryforward [Member]	Dec. 31, 2009 Deferred tax assets related to Canadian losses [Member]
Unrecognized Tax Benefits	$ 0	$ 0	$ 146,000	$ 2,921,000
Provision for United States income taxes applicable to undistributed foreign earnings	0
Undistributed earnings of controlled foreign subsidiaries	155,400,000
Tax credits percentage of qualified maintenance expenditures to reduce federal income tax	50.00%
Tax credits limitation per mile on maintenance expenditures to reduce federal income tax	3,500
Capital loss carryforwards utilized	5,400,000	1,600,000
Operating loss carryforwards	28,800,000
Capital loss carryforwards	15,000,000		500,000
Deferred tax assets, capital loss carryforward	5,251,000	6,367,000
Track maintenance credit carryforward	38,238,000	37,639,000
Change in valuation allowance	$ (1,100,000)	$ (3,200,000)			$ 200,000	$ (800,000)