Income Taxes Liability for Uncertain Tax Positions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Balance at beginning of year	$ 3,155,000	$ 3,155,000	$ 0
Increase for acquired subsidiary	0	0
Increase for tax positions related to the current year	1,169,000	0	0
Reductions for tax positions of prior years	0	0	(215,000)
Balance at end of year	4,324,000	3,155,000	3,155,000
RailAmerica [Member]
Income Tax Contingency [Line Items]
Increase for acquired subsidiary			$ 3,370,000